Electric Pool Heaters for Inground Pools: Heat Pump Models Compared

Swimming in late September or early May comes down to one thing: whether the water is above roughly 80 degrees. For an inground pool, the practical electric choice is a heat pump pool heater, which moves heat from outside air into the water rather than burning fuel. It heats more slowly than gas but uses far less energy per degree gained, so the operating cost over a long season is much lower. Straight electric resistance heaters exist, though they suit only small spas and very small pools because they draw enormous power for the heat they deliver.

The six picks below are real heat pump lines from established pool equipment makers, described only by what their names tell you. Confirm sizing, voltage, and warranty details on the manufacturer’s page, as of 2026. Pool heaters need a dedicated 240 volt circuit and a plumbing connection, so professional installation is the norm. If you are also planning heat for the pool equipment shed or a nearby workshop, see our guide to an electric garage heater for similar circuit planning.

Quick Picks

Every pick in this table is a heat pump, which is the electric format that makes economic sense for a full-size inground pool. The differences come down to brand ecosystem, noise, and how well the unit matches your pool volume and climate. Start with sizing, then decide whether you want to stay inside a brand family for pumps and controllers.

How to Choose

Size by surface area and climate

Heater output is measured in BTU per hour. A common sizing guide is that a typical residential inground pool of 15,000 to 25,000 gallons needs roughly 85,000 to 120,000 BTU for a heat pump in mild climates. Pools in cooler regions or with shade and wind exposure need more. Ask the installer to match the unit to your pool surface area and desired temperature rise, because surface area drives heat loss more than total volume does.

Understand COP and operating limits

Heat pumps are rated by coefficient of performance, or COP. A value of 5 means five units of heat per unit of electricity, which is much more efficient than resistance heat. COP drops in cold air, and most units stop efficient operation when outdoor air falls below about 45 to 50 degrees Fahrenheit, so a heat pump extends the season rather than allowing winter swimming. Look for a published COP at a stated air temperature.

Electrical and plumbing requirements

Most pool heat pumps need a dedicated 240 volt circuit with a breaker in the 40 to 60 amp range, plus a bypass or flow valve on the return line. Look for a titanium heat exchanger for corrosion resistance, particularly in saltwater pools. Confirm your equipment pad has the clearance the manufacturer specifies for airflow around the unit, since a blocked intake reduces output and shortens compressor life.

Noise, warranty, and extras

Quiet fans matter if the pad sits near a bedroom or patio. Look for a warranty that covers the compressor for several years and the heat exchanger for longer. A digital controller, a pool cover, and a solar blanket all reduce the heating load, so factor them into your plan before buying a bigger unit. A cover alone can cut overnight heat loss dramatically.

Our Picks Reviewed

The notes below rely on the brand, line, and heater type in each name, and on how heat pumps behave as a category. Verify BTU output, voltage, and warranty on the manufacturer’s page for the exact model your installer recommends.

Hayward HeatPro Heat Pump

Hayward is a major name in pool equipment, and the HeatPro line is a heat pump option for typical residential inground pools with standard plumbing.

• Pro: a heat pump uses much less electricity per degree gained than resistance heating.
• Pro: an established brand means plenty of local installers, service techs, and parts.
• Con: heat pumps heat slowly and need warm enough air to work efficiently.

Best use: a standard family pool in a mild climate with a cover. Skip it if you want fast heating on a cold weekend, since gas heats more quickly.

Install tip: ask the installer to place the unit on a level pad with the clearances the manual describes, and to include a bypass valve and unions for easy service. A heat pump on a shaded, damp pad works harder, so choose a sunny, well-drained spot.

Hayward Energy Pro Heat Pump

The Energy Pro name signals an efficiency-minded line from Hayward, aimed at owners who care about running costs across a long swimming season.

• Pro: efficiency focus can help long-season heating budgets stay manageable.
• Pro: Hayward’s support network is wide, which helps with warranty service.
• Con: efficiency-oriented models can cost more up front than basic units.

Best use: a pool that stays warm for months and runs the heater often. Skip it if you only swim a few weeks a year, where a simpler unit may be enough.

Install tip: compare the estimated yearly operating cost for different models with your local power rate, and ask the installer how long it will take to reach your target temperature. A higher-efficiency unit repays its price over many seasons of use.

Pentair UltraTemp Heat Pump

Pentair makes complete pool systems, and the UltraTemp is its heat pump line, useful if the rest of your equipment is already from the same brand.

• Pro: easy to match with existing Pentair pumps, filters, and automation controllers.
• Pro: a mainstream brand with broad dealer coverage across most regions.
• Con: a heat pump depends on outdoor air, so cold snaps limit output.

Best use: a pool already on a Pentair control system. Skip it if your pool is in a very cold climate and you swim year-round.

Install tip: if you already have a smart pool controller, ask whether the heat pump connects to it so you can set schedules and temperature limits. Matching components often simplify wiring and reduce the number of separate remotes in the house.

Raypak Crosswind Heat Pump

Raypak is a long-time heater maker, and the Crosswind is its heat pump line for residential pools that want a dedicated heating specialist behind the unit.

• Pro: a heater specialist brings familiarity with pool heating loads and installation practices.
• Pro: heat pump operation is far cheaper to run than resistance heating.
• Con: dealer availability can vary by region, so check local support before buying.

Best use: an owner who prefers a heating-focused brand and has a local dealer. Skip it if no nearby installer services the brand.

Install tip: before buying, call a local installer to confirm they stock parts and offer service for the brand. A good warranty means little if nobody nearby can honor it, so local support is part of the real price of ownership.

AquaCal TropiCal Heat Pump

AquaCal is a specialist heat pump manufacturer, and TropiCal is a well-known line for residential pools in warmer states with long swim seasons.

• Pro: a specialist brand focuses entirely on pool heat pumps and tends to know the niche well.
• Pro: suits owners who want to extend the swim season at both ends.
• Con: specialist brands may have fewer retail outlets than the big names.

Best use: a warm-climate pool with a long season. Skip it if you want one-stop shopping with the rest of your pool equipment.

Install tip: in warm climates, consider the coastline and humidity when choosing a model, since salt air accelerates corrosion on cheaper metal parts. A titanium exchanger and a coated cabinet are worth asking about if the pool uses salt.

AquaCal HeatWave SuperQuiet Heat Pump

SuperQuiet is right in the name, signaling a focus on lower fan and compressor noise for pools near homes, patios, and neighboring property lines.

• Pro: quiet operation suits equipment pads near bedrooms or seating areas.
• Pro: AquaCal is dedicated to heat pumps, so the product line is focused.
• Con: quiet models often cost more than standard versions with similar output.

Best use: an equipment pad close to the house. Skip it if the pad is far from the home, where noise barely matters.

Install tip: even a quiet unit benefits from distance and a barrier, so place the pad away from windows and bedroom walls when the layout allows. A simple fence or shrub screen, set back from the intake, helps with both noise and appearance.

Which One Fits

Match the heat pump to the pool, the pad location, and the brands already in your equipment set.

• Mainstream installation: Hayward HeatPro or Pentair UltraTemp.
• Efficiency-focused buyer: Hayward Energy Pro.
• Quiet pad near a patio: AquaCal HeatWave SuperQuiet.
• Longer swim season in warm states: AquaCal TropiCal.
• Pool with Raypak equipment: Raypak Crosswind.

Once the heater is running, set the thermostat a few degrees below your ideal and raise it gradually. Every degree of extra water temperature raises the running cost, so a cover, a wind break, and a modest target do more for the bill than any single feature.

Common Mistakes

1. Sizing the heater from a guess instead of pool surface area and climate.
2. Ignoring the cold-air operating limit and expecting winter swimming.
3. Skipping a pool cover, which loses heat overnight and wastes the heater’s work.
4. Installing without a dedicated breaker of the right size.
5. Blocking airflow around the unit with shrubs, fences, or storage.

FAQ

Are electric pool heaters expensive to run?

Heat pumps cost far less to run than resistance heaters, but a cover is essential for savings and for holding the temperature overnight.

Can I heat a pool in winter?

Not efficiently in freezing weather. Heat pumps extend the shoulder seasons rather than enabling winter swimming.

How long does heating take?

Often a day or two to gain several degrees, depending on pool size, cover use, and weather.

What about heating other spaces nearby?

A pool house or cabana can use a unit from our electric room heaters list, as long as the outlet and clearances are suitable.

Do I need lighting around the pool?

A dusk to dawn light near the equipment pad improves safety at night and makes service visits easier.