Your geyser is the single biggest electricity user in your home, typically 30 to 50% of your monthly bill. Synergy designs and installs PV Solar Water Heating (Geyser Gecko) and inverter Heat Pump systems (ITS, Alliance Air, Samsung) that pay for themselves in 3 to 5 years and run almost free for 15+ years after that. Free site assessments across Pretoria, Cape Town and Polokwane.
Book a Free Site Assessment See How It WorksSynergy Energy Solutions designs and installs solar water heating (PV "solar geyser" systems) and inverter heat pump geysers for homes, guesthouses, hotels, schools, swimming pools and underfloor heating across Gauteng, the Western Cape and Limpopo. A PV solar geyser uses solar panels to power your existing geyser element; a heat pump geyser pulls warmth from the air at roughly a third of an electric geyser's running cost. Both cut your geyser bill by 50 to 70% (up to 90% when paired with solar PV) and pay back in 3 to 5 years. Residential systems start from R24,900 installed (heat pump) or R26,800 installed (PV solar water heating). We install ITS, Alliance Air and Samsung heat pumps and Geyser Gecko PV controllers, every electrical install is technician-installed, electrician-certified and issued with a Certificate of Compliance (SANS 10142-1).
Reviewed June 2026 by the Synergy water heating team.
Eskom estimates that water heating accounts for roughly 30 to 50% of a typical South African home's electricity bill. On a R3,200 monthly account that's R1,120 a month, around R13,440 every year, going to one appliance. PV Solar Water Heating and modern inverter Heat Pumps both cut that figure by 50 to 70%, and up to 90% when paired with a hybrid solar PV system that's already generating excess daytime power. They pay for themselves in 3 to 5 years and run almost free for the 15+ years after that. The choice between the two depends on roof, climate, household size and budget.
A standard 150-litre electric geyser draws around 3 kW. It's heating water for about four hours a day to keep the tank at 60 °C, and most of that energy goes into compensating for standing heat loss while you're at work, asleep, or away on holiday. Your geyser is heating water for nobody, all year round.
Who this matters most for: families of four or more, households with electric showers and baths daily, guesthouses and B&Bs paying commercial tariffs, hotels and lodges with 20+ rooms, schools and hostels with high-demand windows, and anyone whose electricity bill has crept past R3,000/month. The bigger the hot-water demand, the faster a PV or heat-pump system pays back.
Typical SA household appliance breakdown · % of monthly bill
Whether it's a single home geyser, a 60-room hotel, a heated pool that opens the swimming season eight months a year, or a hydronic underfloor loop in a new build, Synergy designs and installs the system that fits your hot-water demand, your budget and your operating costs. Pick the application that matches your site to jump to the detailed breakdown.
Cut your geyser bill by 50 to 70% with PV Solar Water Heating (Geyser Gecko) or an inverter Heat Pump (ITS, Alliance Air, Samsung), sized to your family's daily use.
Inverter heat pump systems sized for properties with continuous, high-volume hot water demand, typically slashing operating costs by 60 to 70% versus electric geyser banks.
Dedicated pool heat pumps that warm pools at a fraction of an electric element's running cost, extending the swim season by 4 to 6 months.
Hydronic underfloor heating loops powered by a dedicated heat pump, radiant warmth from the floor up at low water temperatures (35 to 45 °C).
Tell us your property type and average monthly hot-water demand, we'll recommend the right system honestly, even if it isn't the most expensive option.
Forget the old-school solar geyser tubes on the roof. PV Solar Water Heating uses standard photovoltaic panels, the same panels that power a home solar system, to generate DC electricity, which is fed directly into your existing geyser's heating element via a smart controller. No plumbing changes. No glycol loops. No solar-thermal collector to fail.
PV Solar Water Heating uses 3 to 6 standard PV panels (typically 1.6 to 3.3 kW total) on the roof to generate DC current. A smart controller, Synergy installs Geyser Gecko, measures available solar power and routes it directly into your existing geyser's heating element, bypassing the grid. When solar is short (cloudy days, evenings), the system seamlessly falls back to grid power. Typical installations on Pretoria, Cape Town and Polokwane homes save 50 to 70% on geyser running costs and pay back in 3 to 5 years.
Three to six monocrystalline PV panels (1.6 to 3.3 kW total) mounted on the north-facing roof generate DC electricity from sunlight. The same technology used in full home solar systems, but here it's dedicated to one job: heating water.
The DC controller (a small wall-mounted unit installed near your distribution board) reads the panels' real-time power output and matches it to what the geyser element can absorb. No batteries, no inverters, no conversion losses.
Your existing electric geyser stays in place, same tank, same plumbing. The controller swaps in DC solar power instead of grid AC. Most installations use a hybrid element that accepts both DC and AC, so the geyser keeps working seamlessly day or night.
On a sunny day, 80 to 100% of your geyser's heating comes from solar. On a cloudy week, the system tops up from the grid only when the tank temperature drops. You don't lift a finger, and your hot shower is always ready.
The geyser tank itself acts as the thermal battery. Water heated during the day stays hot through the night thanks to the tank's insulation. No expensive lithium batteries needed, the simplest, most cost-effective form of solar storage in your home.
A short introduction to Synergy Energy Solutions, who we are and how we design and install solar, water heating and energy systems across South Africa. A dedicated PV solar water heating demo video is coming soon.
Standard monocrystalline panels mounted on north-facing roof. 25-year manufacturer performance warranty. Total array: 1.6 to 3.3 kW depending on geyser size and household demand.
South African-designed smart controller that measures solar availability, routes DC power to the element, and manages the grid fallback. Compact unit installed alongside your distribution board.
No plumbing changes needed. Your existing electric geyser is retrofitted with a hybrid heating element that accepts both DC solar power and AC grid power. Synergy installs and supplies Kwikot tanks where replacement is needed.
Traditional solar thermal "solar geysers", the evacuated tubes or flat-plate collectors you see plumbed onto roofs, heat water directly in panels on the roof. They work, but they share a built-in weakness: almost no control over the heat they make. On a hot, sunny day when nobody's drawing water, a thermal system keeps heating with nowhere for the energy to go, which leads to overheating, scalding water dumped through the pressure-relief valve, and accelerated wear on the system. PV Solar Water Heating sidesteps all of it: it generates electricity and lets a smart controller (Geyser Gecko) decide exactly when, and how much, to heat, so not a drop of hot water is wasted.
| PV Solar Water HeatingPanels + Geyser Gecko controller | Solar Thermal "Solar Geyser"Evacuated tubes / flat-plate collector | |
|---|---|---|
| Heat control | Smart controller modulates the heat and stops once the tank is hot | Little to no control, keeps heating whenever the sun shines |
| Overheating & stagnation | Can't happen, surplus solar simply isn't sent to the element | Common on hot, low-use days; causes stagnation and component stress |
| Water & energy wastage | None, nothing is dumped | Overheated water is vented through the pressure-relief valve, wasted hot water |
| Freezing & scaling | Panels carry no water, nothing on the roof to freeze or scale up | Roof collectors and pipework are exposed to frost and hard-water scaling |
| Roof plumbing | Only a DC cable runs to the roof, no roof water leaks | Hot-water pipes plumbed up to the roof add a leak risk over time |
| Existing geyser | Retrofits to your current tank with a hybrid element | Usually needs a dedicated solar tank plus the roof collector |
| Lifespan | Panels carry a 25+ year performance warranty; very few moving parts | Tubes/collectors typically need replacing sooner; more on-roof wear |
A heat pump doesn't generate heat, it moves heat. Using the same refrigeration cycle as your fridge or air-conditioner (just running in reverse), a heat pump pulls warmth out of the ambient air and pumps it into your water tank. The result: for every R1 of electricity in, you get roughly R3 of hot water out. That's why it's the dominant choice for high-volume commercial water heating worldwide.
A water heat pump uses a refrigerant compressor cycle to extract heat from the surrounding air and transfer it into a hot water tank. Modern inverter units operate at a Coefficient of Performance (COP) of 3 or higher, meaning they deliver three units of heat for every unit of electricity consumed, versus an electric geyser element which delivers just one. Synergy installs ITS, Alliance Air and Samsung Inverter heat pumps from 100-litre residential units up to 5,000+ litre commercial banks. Typical savings: 50 to 70% on hot-water running costs.
The outdoor heat pump unit (about the size of an outdoor air-conditioner) has a fan that pulls air across a coil filled with cold liquid refrigerant. Even on a cold winter morning at 5°C, that air still contains plenty of usable thermal energy.
The refrigerant has an extremely low boiling point, it turns into vapour just by absorbing heat from the air. This is the key trick: low-grade heat in the air becomes usable energy in the refrigerant. The same physics keeps your fridge cold, just running the other way.
An electric compressor, the only part that uses meaningful electricity, squeezes the refrigerant vapour. Compression raises its temperature dramatically, from a cool gas to a hot, high-pressure vapour at over 60°C. This step accounts for roughly one-third of the energy delivered to your tank.
The hot refrigerant flows through a heat exchanger wrapped around (or inside) your hot water tank. Heat transfers into the water; the refrigerant cools, condenses back to liquid, and cycles back to step 1. Your tank water reaches 55 to 65°C, the same temperature an electric geyser delivers, at one-third the running cost.
A short video on inverter heat pump water heating, how a heat pump pulls warmth from the air to heat your water at a fraction of an electric geyser's running cost.
Outdoor unit installed against an exterior wall. Inverter compressors modulate output to match demand, quieter and 30% more efficient than older fixed-speed models. Sized from 3 kW (residential) up to commercial banks.
Either an integrated tank (built into the heat pump for residential) or a stand-alone storage cylinder for commercial sites. Synergy supplies and installs Kwikot tanks where new tanks are required, with appropriate sacrificial anodes for SA water conditions.
Wall-mounted control unit (most models app-enabled) lets you schedule heating windows to match solar PV generation hours, monitor running costs, and receive maintenance alerts. The controller is what turns a heat pump into a system that pays back fastest.
Modern inverter heat pumps run at around 49 dB at 1 metre, quieter than your fridge, comparable to a soft conversation. Mounted on an external wall, you barely hear them inside. Older fixed-speed units were the noisy ones; today's inverter models are not.
Yes, even the coldest mornings in Pretoria, Johannesburg or Polokwane (3 to 5°C) are well within heat pump operating range. COP drops slightly to around 2.5 at 5°C, still 2.5× more efficient than an electric element. Models suited to sub-zero conditions are available for high-altitude lodges.
Both PV Solar Water Heating and inverter Heat Pumps cut residential geyser bills by 50 to 70%. The right choice depends on your roof orientation, your hot-water habits, your existing solar plans and your budget. Here's a straight-talking breakdown, and the actual installed prices for a typical SA family home.
4 people · R3,200/month electricity bill · ±R1,280 of which is geyser (40%)
Projected savings based on 70% reduction off current geyser cost and 12% annual Eskom tariff escalation. Actual savings vary by household usage patterns and system specification, your free site assessment will give you site-specific numbers.
For hospitality properties, guests use hot water in the early morning and at night, exactly when solar isn't generating. That's why we typically recommend heat pumps for guesthouses and lodges, even when there's plenty of roof space. See the full commercial breakdown →
Our free site assessment includes a side-by-side cost projection for both systems on your specific home, so you choose with the actual numbers, not a guess.
Hotels. Lodges. Schools. Hostels. Guesthouses. Restaurants. Gyms. The properties where hot water isn't a comfort, it's the product. Synergy designs and installs commercial-scale heat pump systems that cut hot-water operating costs by 60 to 70% versus electric geyser banks, with payback periods typically under 4 years even on the largest installations.
Hot-water demand in a hotel, lodge or guesthouse follows a predictable daily pattern: heavy use between 5 to 9 am (guest showers before activities or check-out) and again between 6 to 10 pm (after-dinner bathing, kitchen cleanup, laundry). The middle of the day is comparatively quiet.
Solar PV generates exactly when guests aren't using hot water. By the time the first 5 am shower runs, a PV-heated tank has been losing heat overnight for 12 hours and the next solar generation is three hours away. For a 60-room hotel, that's the difference between hot showers and bad reviews.
A heat pump runs whenever the controller calls for heat, predictable, continuous, weather-independent. For commercial hospitality where reliability is the product, that consistency is worth more than the marginal saving difference.
Typical hospitality property · 24-hour curve
Cascaded heat pump banks with buffer-tank storage sized for peak morning demand. Often paired with solar PV to power the compressors during daylight hours.
High-density morning-window demand (7 to 8 am peak). Multiple heat pump units with rotating duty cycles to handle simultaneous shower load. Termly cost reporting available.
Continuous demand from morning to night. Heat pumps sized for steady-state load with surge capacity for class change-over windows. Often combined with pool/jacuzzi heating.
High-temperature demand (60 to 70°C) with predictable shift-based usage. Heat pumps with buffer storage match peak service windows. Significant grease-trap and dishwasher savings.
Reference figures for a typical site · every commercial install is bespoke
| Property Type | Typical Demand | System Capacity | Indicative Investment | Monthly Saving | Payback |
|---|---|---|---|---|---|
| Small B&B (4 to 8 rooms) | 800 to 1,500 L/day | 11 kW heat pump + 500 L tank | R 80,000 to R 130,000 | R 4,500 to R 7,000 | 2 to 3 years |
| Mid-size guesthouse (10 to 20 rooms) | 2,000 to 4,000 L/day | 22 to 36 kW cascade + 2,000 L tank | R 180,000 to R 280,000 | R 9,000 to R 16,000 | 2 to 4 years |
| Boutique hotel / lodge (30 to 60 rooms) | 4,500 to 9,000 L/day | 36 to 44 kW cascade + 3,000 L tank | R 320,000 to R 520,000 | R 18,000 to R 32,000 | 3 to 4 years |
| School / hostel (100+ residents) | 5,000 to 15,000 L/day | 44 to 72 kW cascade + 5,000 L tank | R 380,000 to R 720,000 | R 22,000 to R 48,000 | 3 to 4 years |
| Large hotel (100+ rooms) | 10,000 to 25,000+ L/day | 72 to 100 kW cascade + multi-tank | R 650,000 to R 1.4m+ | R 35,000 to R 80,000+ | 3 to 5 years |
Send us your monthly electricity bills and a brief property description, we'll come back with an indicative sizing, indicative cost and a target payback window before we ever set foot on site.
Most South African pools sit cold from May to October. A pool heat pump turns that 4-month swim window into 8 to 10 months of usable swimming, at roughly a quarter of the running cost of an electric pool element. For hotels, lodges and sports clubs, it's the difference between a feature guests use and a feature guests photograph from a deck chair.
Typical Highveld pool · Pretoria, Johannesburg, Centurion · 30,000 litres
Regional differences matter. Coastal Cape Town pools have milder winters but cooler summers, so heat pumps tend to extend the season more on the shoulders. Limpopo and Lowveld pools can run nearly year-round with the right size unit. Free site assessments include a regional climate review.
Most installs we do. Sized to your pool volume and target temperature (26 to 28°C is the sweet spot). Pairs naturally with home solar PV, run the heat pump on free solar power during the day.
Larger heat pumps for keeping guest pools at consistent target temperature, even in winter, even at 6 am. A heated pool is one of the strongest booking-conversion factors in shoulder-season hospitality.
Year-round operation with cascaded heat pumps for redundancy. Schools save tens of thousands per term versus electric heating; sports clubs extend training calendars from 5 to 10 months without compromise.
Reference figures · target temperature 27°C · with thermal cover
| Pool Volume | Heat Pump Capacity | Indicative Installed | Monthly Running (Heated) | vs Electric Element |
|---|---|---|---|---|
| 15,000 L (small plunge) | 5 to 7 kW | R 19,999 to R 24,999 | R 350 to R 600 | ~25% of cost |
| 30,000 L (typical residential) | 9 to 13 kW | R 24,999 to R 29,999 | R 700 to R 1,200 | ~25% of cost |
| 50,000 L (large residential) | 14 to 18 kW | R 34,999 to R 42,999 | R 1,200 to R 1,900 | ~25% of cost |
| 100,000 L (small commercial) | 25 to 35 kW | R 49,999 to R 64,999 | R 2,500 to R 4,200 | ~22% of cost |
| 300,000+ L (lap / competition) | 50 to 80 kW cascade | R 169,999 to R 249,000 | R 7,000 to R 13,000 | ~22% of cost |
For hotels, lodges and large homes, a single engineered heat pump bank can handle both the pool and domestic hot water, sharing infrastructure, controls and after-sales servicing.
One install. One contractor. One smart controller routing capacity where it's needed: pool by day, guest showers by morning. It's how the smartest commercial properties get the most out of every kilowatt.
Even the best heat pump can't beat physics, an uncovered pool loses 70 to 80% of its heat to evaporation overnight. A simple thermal cover roughly halves your running costs and doubles your usable swim window. We'll tell you this before you spend a cent on a heat pump, and we'll recommend cover sizing as part of every assessment.
Tell us your pool volume, target temperature and whether you have a cover, we'll come back with sizing, indicative cost and projected monthly running figures.
A network of cross-linked PEX-EVO pipes laid beneath your screed, circulating warm water at 35 to 45 °C, turning the floor itself into a giant low-temperature radiator. No fans, no draughts, no hot spots, just the kind of even, gentle warmth that makes a tiled bathroom feel like a hotel and a tiled living room feel finished.
This page covers hydronic underfloor heating, warm water circulating through PEX-EVO pipes in a screed. It's significantly more cost-effective to run than electric underfloor wires, especially for whole-home heating, because it can be powered by an efficient heat pump (or boiler, or solar thermal). Electric underfloor mats are a separate product, suited only to small wet rooms.
Cross-linked polyethylene with an EVOH oxygen barrier. Long-life, corrosion-resistant pipework laid in loops at 100 to 200 mm spacing depending on heat loss.
Stainless-steel manifold per zone (typically one per floor or wing), with thermostatic actuators for room-by-room control via wall thermostats.
We design around the right heat source for your site: inverter heat pump, gas boiler, biomass or solar thermal. Heat pumps are usually most efficient at underfloor's 35 to 45 °C operating temperature.
Every loop pressure-tested at 6 bar before screeding to confirm no leaks. Test certificate retained for warranty and any future renovation work.
EPS or PIR insulation board sits under the PEX loops to drive heat upward, not into the slab below. Critical for efficiency, skipping this step doubles your running costs.
Per-zone smart thermostats with optional weather compensation, the system pre-heats before cold fronts so the slow underfloor response time is invisible to you.
Bathrooms typically 5 to 12 m². Heat-pump add-on if not already on a hydronic system. Works beautifully on tile finishes.
30 to 80 m² wing or extension. Most cost-effective when added during a renovation (floors are already up).
120 to 280 m² family home. Includes per-zone thermostats, manifold(s), heat pump and full pressure testing. Pairs naturally with home solar PV.
Large homes (300 m²+), complex zoning, premium thermostats, weather-compensation controls, integrated solar thermal options.
This is the water heating context, for the complete underfloor specification, room-by-room sizing examples and installation gallery, visit our dedicated underfloor heating page →
Sixteen criteria, head-to-head. We've laid out the honest answer to every comparison question we've been asked over 16 years of installs. Both systems deliver 50 to 70% savings on geyser running costs, the right choice depends on your site, your habits and your priorities.
| PV Solar Water HeatingGeyser Gecko system | Heat PumpITS · Alliance Air · Samsung Inverter | |
|---|---|---|
| How it works | PV panels generate DC, fed straight into the geyser element via a smart controller | Refrigeration cycle extracts heat from ambient air and pumps it into the tank |
| Typical savings | 50 to 70% reduction in geyser running cost | 50 to 70% reduction; up to 75% on high-demand sites |
| From price (residential) | From R26,800 installed | From R24,900 installed |
| Typical payback | 3 to 5 years | 2 to 4 years (faster on high-demand households) |
| Roof requirement | Needs unshaded north-facing roof (3 to 6 panels) | None, outdoor unit on any external wall |
| Day-night performance | Day only, falls back to grid at night | Day or night, sun or cloud, runs whenever needed |
| Winter performance | Reduced output on overcast winter days; tops up from grid | COP drops slightly to ~2.5 at 5 °C; still 2.5× more efficient than an element |
| Mechanical complexity | No moving parts (panels, controller, hybrid element only) | Compressor, fan, refrigerant circuit, like a fridge |
| Noise | Silent, no moving parts | ~49 dB at 1m (quieter than your fridge) |
| Existing geyser? | Almost always retrofits to your existing tank | Integrated tank typical for residential; split-tank options for commercial |
| Best fit households | Smaller families, light/moderate hot-water use | Larger families, heavy hot-water use, daily baths/laundry |
| Best fit applications | Single-family homes, sectional title (with roof access) | Hotels, lodges, schools, gyms, pools, underfloor, all commercial |
| Pairs with solar PV? | Already is solar, but pairs with hybrid PV for whole-home savings | Excellent pairing, runs compressor on free daytime solar power |
| Servicing | Minimal, annual visual check, replace controller every 10 to 15 years | Annual inspection (fan, compressor, refrigerant level) |
| Lifespan | Panels: 25+ year warranty · controller: 10 to 15 years | Inverter heat pump: 12 to 15 years typical · tank: 10+ years |
| Load shedding behaviour | Keeps heating during day even if grid is down | Pauses during outage; tank water stays hot for hours |
You have an unshaded north-facing roof, a working geyser, and want the simplest possible system with zero moving parts. It's the right call for most single-family homes that aren't running a guesthouse on the side. Cleanest, simplest, longest-life option.
You have heavy daily hot-water use, a shaded roof, an existing PV system already taking up roof space, or any commercial property, hotel, lodge, school, gym, pool. The right call for almost every commercial and high-demand site.
A free Synergy site assessment includes a side-by-side cost projection showing both systems on your property, with your hot-water usage and your Eskom tariff.
Sixteen years of installations across solar PV, batteries, water heating and underfloor systems. Three branches across South Africa. A team that designs systems honestly, and tells you when something isn't worth it.
Energy systems since 2010, through every iteration of solar tech, every load-shedding stage, every Eskom tariff hike.
Gauteng, Western Cape and Limpopo, local teams, local site visits, local after-sales support.
Real, dated, public reviews on our Google Business listing. Currently 4.7 stars from 73 verified customer reviews.
Solar PV, batteries, water heating, pool, underfloor, designed to work together. One contractor, one accountability line.
Anyone can quote you a heat pump. The question we ask first is: how does it sit alongside your geyser, your inverter, your batteries, your pool pump and your future plans? That's the difference between an installation that works and a system that pays back.
From your first site assessment through to final commissioning, you're working with one team who understands every component, because we install all of them every day.
Site assessments, installations and after-sales servicing handled by local technicians who know their region, not a centralised call centre.
Grouped by topic so you can jump to what you need. If your question isn't here, ask us directly during your free site assessment, every question has come up enough times that the answer is in the proposal we hand you.
Both PV Solar Water Heating and inverter heat pumps typically reduce your geyser running cost by 50 to 70%, and up to 90% when paired with a hybrid solar PV system that's already generating excess daytime power. On a typical SA household where the geyser uses 30 to 50% of the monthly bill (often R1,000 to R1,500), that's R6,000 to R10,000 saved every year. Actual savings depend on your hot-water habits, system sizing, and whether you also have solar PV.
Pick PV solar water heating if you have an unshaded north-facing roof, a working geyser, and want the simplest possible system with no moving parts. Pick a heat pump if you have heavy daily hot-water use, a shaded or already-solar-covered roof, or you need consistent performance day and night. For commercial properties, hotels, lodges and pool heating, heat pumps are almost always the right choice. We'll recommend honestly after a free site assessment, no commission-based bias.
Residential systems typically pay back in 3 to 5 years for PV solar water heating and 2 to 4 years for heat pumps. Heat pumps are slightly faster on high-demand households because the saving compounds with usage. Commercial installations (hotels, schools, large lodges) typically pay back in 3 to 4 years even on the largest projects, because the volume of hot water heated tilts the maths sharply in the heat pump's favour.
A useful rule of thumb is 50 litres of hot water per person per day, with extra for laundry and kitchens. A family of four typically needs a 200-litre tank with a 3 kW heat pump, or a 200L geyser plus 3 to 4 PV panels. Commercial sites are sized by occupancy and demand pattern, a 20-room guesthouse needs roughly 2,500 L/day capacity. Every Synergy assessment includes site-specific sizing, not a one-size-fits-all package.
For PV solar water heating, almost always yes, the system retrofits to your existing geyser by swapping the heating element for a hybrid DC/AC element. No plumbing changes needed. For a heat pump, it depends: integrated heat pumps come with their own tank, while split-system heat pumps can connect to your existing tank if it's in good condition (under 10 years old, no corrosion, sufficient size). We'll inspect and tell you honestly whether yours is worth keeping.
If your goal is the lowest possible electricity bill, install the water heating system first. Your geyser is likely 30 to 50% of your monthly bill, solving that first means a smaller PV system covers everything else. If you've already committed to going fully off-grid, install both together so the heat pump's daytime cycles run on solar generation. Either way, designing them to work together (rather than as separate projects) saves 10 to 15% on total system cost.
PV solar water heating keeps working during the day, the panels generate DC power and feed the geyser element directly, no grid needed. Heat pumps require grid or battery power to run the compressor; if the power's out, the system pauses but the existing hot water in the tank stays hot for several hours. If you're paired with a battery and inverter, both systems keep running through outages. The tank itself acts as a thermal battery, your shower water doesn't go cold the moment the lights flicker.
Yes, with the right size unit. A family of six typically needs a 5 kW heat pump paired with a 250 to 300 litre tank, that handles 300+ litres of hot water demand per day comfortably. For very high-demand households (multiple daily baths, frequent laundry, hot tub use), we sometimes recommend a 5 kW heat pump plus a buffer tank, or two cascaded smaller units for redundancy. Site assessment determines what's actually needed.
Hot-water demand in hospitality follows a predictable daily pattern: heavy use 5 to 9 am (guest showers) and 6 to 10 pm (after-dinner bathing, kitchen, laundry), with a quiet middle of the day. Solar PV generates exactly when guests aren't using hot water, and tank thermal losses overnight mean a PV-heated tank is half-cold by 6 am. A heat pump runs whenever the controller calls for heat, predictable, continuous, weather-independent. For commercial hospitality where reliability is the product, that consistency is worth more than the marginal savings difference.
We design every commercial install around minimal disruption. For most hotels and guesthouses, the existing geyser bank stays in service while the new heat pump system is plumbed and commissioned alongside it, typically a one-day cutover with minimal downtime, scheduled to a low-occupancy window. Phased rollouts for larger properties let us bring zones online one at a time. We plan every cutover specifically to avoid leaving guests without hot water, and we schedule accordingly.
Most commercial heat pump installations pay back in 3 to 4 years, even on systems costing R500,000 or more. The reason: commercial properties run their hot water hard, daily volumes of 5,000 to 15,000 litres are common, so the saving versus electric geyser banks compounds fast. A 60-room hotel saving R30,000 a month on hot-water electricity recovers a R450,000 investment in roughly 15 months on operating savings alone.
Yes. Every commercial system includes the option of an annual servicing contract, fan and compressor inspection, refrigerant check, filter cleaning, controller diagnostics and a written performance report. Available across all three Synergy regions (Gauteng, Western Cape, Limpopo). For mission-critical sites we offer faster-response service plans with parts held locally. Full service plans, call-out rates and what's covered are on our water heating service page.
Yes. Even the best heat pump can't beat physics, an uncovered pool loses 70 to 80% of its heat to evaporation overnight. A simple thermal cover roughly halves your running costs and doubles your usable swim window. We recommend cover sizing as part of every pool heating assessment, and we'd rather you spent R5,000 on a good cover before R50,000 on a heat pump than the other way around.
Yes, within reasonable limits. Pool heat pumps maintain target temperature through SA winters as long as the air temperature stays above 0 to 5 °C. Performance drops slightly in cold weather (the COP falls from around 5 to around 3.5 on cold mornings), but the pump still runs. With a thermal cover, most Highveld and coastal pools can stay swimmable from September through May. Properties in genuinely sub-zero regions need higher-spec cold-climate units, which we also install.
Yes, modern pool heat pumps are designed for both salt-chlorinated and conventional chlorine pools, with titanium heat exchangers that resist salt corrosion. We specify the right grade based on your pool's water treatment system. The unit itself sits outside the pool circuit and only sees water through the heat exchanger, so general pool maintenance and cleaning are unaffected by the heat pump.
From cold start, expect 24 to 72 hours to bring a 30,000 L pool from 18 °C up to 27 °C, depending on heat pump capacity and ambient temperature. Once at temperature, the heat pump runs intermittently to maintain heat, typically 4 to 8 hours a day with a thermal cover. Most pool owners run their heat pump continuously through the swim season; the controller only calls for heat when temperature drops below the setpoint.
Yes, but it's more involved than installing into a new build. The existing floor must be lifted, pipes laid in a new screed, and finishes restored. This is most cost-effective when you're already renovating, adding underfloor while the floor is up costs significantly less than doing it as a standalone project. For homes where lifting floors isn't practical, we recommend looking at carbon fibre wall heating as a less invasive alternative.
Underfloor is a slow-response system, typically 2 to 4 hours from cold to comfort temperature, depending on screed depth and insulation. This is why most underfloor systems run continuously through winter rather than being switched on and off. The trade-off is even, gentle warmth that radiators and aircons can't match. Smart controls with weather forecasting can pre-heat the system before cold fronts arrive, so the slow response time is invisible in daily use.
For a well-insulated 200 m² home running an inverter heat pump as the heat source, expect winter running costs of R1,200 to R2,500 per month, significantly cheaper than equivalent gas heating or aircon-based heating, and a fraction of the cost of running radiators on electric elements. Pairing with solar PV reduces this further by running the heat pump cycles during daylight hours. Costs scale roughly with heated area and how well your home retains heat.
Hydronic underfloor heating works with any heat source: inverter heat pump (most popular and most efficient), gas boiler, electric boiler, biomass or solar thermal. Heat pumps are usually the most cost-effective long-term because underfloor's low operating temperature (35 to 45 °C) is exactly where heat pumps run most efficiently. But we install with whatever heat source fits your site, your existing infrastructure and your budget, including dual-source setups.
Every question in this list came from real customer conversations. If yours isn't covered, ask us in your free assessment, or book one now and we'll address it in your written proposal.
Real reviews from real Synergy customers, sourced directly from our Google Business Profile.
"I couldn't be more thrilled with my decision to go solar, and Synergy Energy Solutions made the entire process seamless and enjoyable. From the initial consultation to the final installation, their professionalism, expertise, and dedication to customer satisfaction were evident every step of the way. The installation crew was punctual, efficient, and left my property spotless."
"Thank you Jacques and Jaco from Synergy Energy Solutions. Your professionalism and excellent service resulted in a great solar installation and solution. We are very happy and would recommend you to anyone looking for a residential or commercial solution. We can vouch for both. Well done."
"What an absolute pleasure to have Synergy as my solar provider. After I have been scammed previously by a 'reputable' company, I was unsure where to turn next. Synergy was recommended and from day one they exceeded my wildest expectations. Very professional, always friendly, prompt service and the list goes on. Thank you Jean and team, you guys rock!"
"What a pleasure to deal with Synergy, it's a company with experience and after-care service. Jacques always takes my calls (and there were many) during and after the installation, always willing to assist, always monitoring our system for optimal usage. Our site was always clean, they were always on time. Jacques and team, thank you, it's much appreciated."
"Synergy Energy Solutions is an excellent company, very good workmanship as requested. The system looks neat and professional. Thank you also for the over-and-above tasks that were performed for the preparation of the installation. The system has been running for a month now, I was always immediately assisted by competent personnel. The form, fit and function of the system is awesome!"
"I have used Synergy Solutions to do solar installations on two separate occasions. In both instances I found them to be speedy, professional, friendly and extremely competent. I can highly recommend them."
Read all 73 reviews on our Google Business Profile.
Water heating is one piece of the puzzle. We design and install complete energy systems, solar, batteries, EV charging and heating, all under one roof, with one accountable team. Explore the rest of our range.
Full home and business solar PV, cut your whole electricity bill, not just the geyser. The foundation of every Synergy energy system.
View detailsWhole-home battery backup with 11 kW power and the Tesla app, keep the lights (and the geyser) on through load shedding.
View detailsAI-powered 5-in-1 system, inverter, battery, solar and EV charging in one smart, compact unit.
View detailsBattle-tested Victron inverters and solar systems paired with Freedom Won & BSL batteries, for homes, farms and off-grid sites.
View detailsReliable hybrid inverters, the dependable workhorse of South African home solar, sized to your needs.
View detailsAC and DC electric-vehicle chargers set up to run on your own solar power, charge the car on free daytime sunshine.
View detailsAlready have a heat pump or solar geyser? Servicing, repairs and maintenance plans to keep it running at its best.
View detailsQuiet, even, whole-room warmth from the floor up, powered efficiently by a heat pump, and pairs with solar PV.
View detailsSlimline carbon-fibre wall panels, fast, efficient room heating with no floors to lift. A great low-disruption alternative.
View detailsSchedule a free, no-obligation site assessment with our water heating specialists. We'll review your hot-water demand, your roof orientation, your existing geyser or solar setup, and your budget, and we'll recommend the right system honestly, even if it isn't the most expensive option.
One of our water heating specialists will be in touch to discuss your property and arrange your free site assessment.
Prefer to talk now? Call us on 010 601 6464