The right swimming pool heat pump size depends on three things: your pool's surface area and volume, the water temperature you want, and whether the pool is covered. As a starting point, a smaller residential pool is often served by an 11kW unit, an average family pool by around 15kW, and a larger pool, or one you want to heat quickly, by 17kW. But surface area and a pool cover matter more than most people expect, so this guide shows how to choose properly.
Heating a pool with electricity directly is expensive. A heat pump changes that by moving heat from the air into the water, delivering several units of heat per unit of electricity, and when you run it on solar, the cost per swim drops further still.
Key Takeaways
- Pool heat pumps move heat, delivering several kWh of warmth per kWh of electricity, which makes them far cheaper to run than electric resistance heaters.
- Size by surface area, target temperature, and cover use, not just pool volume. Heat is lost mainly from the water surface.
- The Deye R32 pool heat pump comes in 11kW, 15kW, and 17kW versions with a titanium heat exchanger built for pool water.
- Its Hybrid AC/DC design lets it heat the pool with direct solar by day and AC power when sunlight changes.
- A pool cover is the highest-value upgrade you can add: it can roughly halve heat loss.
Why a heat pump beats other pool heaters
There are three common ways to heat a pool, and they are not equal:
- Electric resistance heaters convert electricity straight to heat at roughly 1:1, which is simple but very expensive to run.
- Gas heaters heat fast but burn fuel continuously, with rising costs and emissions.
- Heat pumps move heat from the air into the water, delivering several units of heat per unit of electricity.
For a load as large as a pool, that efficiency multiplier is decisive. A heat pump's higher purchase price is repaid through dramatically lower running costs over a swimming season, and even more so when paired with solar.
How to size a pool heat pump
Pool sizing is driven by heat loss, and most heat escapes from the water surface through evaporation, radiation, and convection. That is why surface area matters more than depth.
Four factors decide the size you need:
- Surface area: the bigger the surface, the faster heat escapes, the more power you need.
- Target temperature: every extra degree above ambient costs more energy to maintain.
- Location and wind: exposed, windy sites lose heat faster.
- Cover: a cover dramatically cuts evaporation, the biggest loss.
The Deye R32 range maps to pool size like this:
| Model | Output | Best for |
|---|---|---|
| 11 kW | 11 kW | Smaller residential pools |
| 15 kW | 15 kW | Stronger everyday heating demand |
| 17 kW | 17 kW | Larger pools / faster temperature recovery |
Case 1: Small covered pool. A modest residential pool that is kept covered when not in use loses far less heat, so an 11kW unit can hold temperature comfortably and recover quickly after a swim.
Case 2: Larger uncovered pool. A bigger pool left open to wind and evaporation needs more output to keep up; a 17kW unit both maintains temperature and recovers it faster after cold nights.
When in doubt, size up slightly: a heat pump running a little under capacity is efficient and recovers temperature faster, while an undersized unit runs constantly and still struggles on cool days. Your pool installer can confirm the right model for your specific dimensions and climate.
What R32 and a titanium heat exchanger mean
Two technical features make the Deye pool range well-suited to its job:
- R32 refrigerant. R32 is an efficient refrigerant with a much lower global warming potential than many older types it replaces. It is widely used in modern heat pumps for its good energy performance.
- Titanium water-side heat exchanger. Pool water contains chlorine and salt, which corrode ordinary metals. A titanium heat exchanger resists that corrosion, which is essential for a long service life in pool and spa water.
The range also uses inverter operation, meaning the compressor varies its speed to match demand rather than switching fully on and off. That gives quieter running, steadier water temperature, and better efficiency than fixed-speed units.
Note that this is a dedicated pool heat pump, not a home-heating unit. If you want to heat your house and hot water, see our R290 air-to-water heat pump guide instead.
Heating your pool with solar
Pools have a useful quirk: they are most enjoyable in summer, which is exactly when solar production is highest. That makes solar pool heating a natural fit.
The Deye R32 range uses Hybrid AC/DC operation: connect compatible PV panels to support pool heating during the day, with AC power available for stable operation when sunlight changes. Ways to combine the two:
- Direct PV to the heat pump during sunny hours, when the pool is also most used.
- A rooftop PV system powering the home, with the pool pump and heater as large, flexible daytime loads.
- Smart scheduling with a wireless CT, so the pool heats mainly from surplus solar rather than grid power.
Because pool heating is a large, time-flexible load, it is one of the best appliances to run on excess solar: you are effectively storing sunshine as warm water. A large whole-home battery can extend heating into the evening, while a compact plug-and-play unit like the Deye AE-FS2.0-2H2 balcony energy storage is designed to offset your home's indoor baseline loads, leaving your main rooftop array free to run the heavy pool heat pump during the day.
If your main rooftop solar is already maxed out, you can install a dedicated local array on a nearby pool house or carport roof, then connect it through a Deye SUN-M200G4 microinverter to feed extra solar straight into your home's pool circuit.
Get the most from your pool heat pump
A few habits make a big difference to running cost:
- Use a cover. This is the single highest-value step: it sharply reduces evaporation, the main source of heat loss.
- Heat during the day. Run the heat pump in daylight to use solar and warmer air, both of which improve efficiency.
- Set a sensible temperature. Each degree higher costs more to maintain; find the lowest comfortable setting.
- Maintain water flow. Keep filters clean so the heat exchanger gets proper flow.
⚠️ Installation is not included, and the system must be installed by a certified professional for safety, compliance, and warranty validity.
Frequently asked questions
What size pool heat pump do I need? It depends on surface area, target temperature, exposure, and cover use, not just volume. As a guide, 11kW for smaller pools, 15kW for average demand, 17kW for larger pools or faster heating.
Is R32 a good refrigerant for a pool heat pump? Yes. R32 offers good efficiency and a lower global warming potential than many older refrigerants, which is why it is common in modern units.
Why does it need a titanium heat exchanger? Pool water's chlorine and salt corrode ordinary metals. Titanium resists corrosion, giving a much longer service life.
Can I run it on solar? Yes. The Hybrid AC/DC design features simultaneous power blending. It prioritizes free DC power drawn directly from your panels during daylight hours and instantly supplements any precise power deficit from the AC grid when clouds pass, keeping the compressor running smoothly without interruptions.
Conclusion: size for the surface, heat with the sun
Choosing a swimming pool heat pump comes down to matching output to your pool's surface area, target temperature, and exposure, then using a cover to slash heat loss. The Deye R32 range covers small to large pools with efficient inverter operation and a corrosion-resistant titanium heat exchanger, and its Hybrid AC/DC design lets you heat the water with your own solar during the sunniest months.
Size it right, cover the pool, and heat in daylight, and you extend your swimming season at a fraction of the running cost of electric or gas heating.
Find your model: explore the Deye R32 Swimming Pool Heat Pump (11/15/17kW) or browse all Deye HVAC systems, then ask your installer to confirm sizing for your pool.
