Electric Pool Heaters Explained: Heat Pump Models Worth Shopping

The pool looks inviting in May, but the water reads 68 degrees and nobody wants to get in. That gap between a warm afternoon and a swimmable pool is the reason owners look into heaters, and electric options have become the default for people without a gas line or who want lower running costs over a long season. In most cases, the electric heaters sold for in-ground pools are heat pumps, which pull warmth from the outside air rather than burning fuel.

This guide covers six heat pump models from Hayward, Pentair, Raypak, AquaCal, and FibroPool. Since sizing is more important than brand, the first half explains how to match a heater to your pool, and the second half reviews each product based solely on what its name tells you. As of 2026, heat pumps remain the dominant electric choice, so those are the models you will see below.

Quick Picks

How to Choose

Size the heater to your pool volume

Heat output is measured in BTU per hour. A common rule is that a 15,000 gallon pool in a mild climate needs roughly 50,000 BTU, while a 30,000 gallon pool often needs 100,000 BTU or more. Undersized units run for hours and may never reach the target temperature. Oversized units cost more upfront but reach temperature faster and cycle less. Always check the manufacturer’s sizing chart against your gallons and the temperature rise you want.

Check the coefficient of performance

Heat pumps are rated by coefficient of performance, or COP, which shows how many units of heat are produced for each unit of electricity. A COP of 5.0 means five units of heat per unit of power. Look for a rating of 5.0 or higher at 80 degrees air, and remember that COP drops as the outside air gets colder. Pools in cool climates benefit from models rated for low air temperatures.

Confirm the electrical requirements

Most pool heat pumps need a dedicated 220 to 240 volt circuit, commonly 30 to 60 amps depending on the size. Your electrician must verify the panel has capacity and that the wire gauge matches the load. This is not a plug-in appliance. Allow for installation labor, a disconnect box, and a plumbed bypass so water flows properly through the heater.

Plan the placement and noise

The unit needs open airflow on the intake and exhaust sides, usually at least 3 feet of clearance and more above. Keep it away from bedroom windows, as the fan makes noise, and place it on a level pad within a reasonable distance of the pool equipment to keep plumbing runs short. A pool cover is nearly essential because it reduces heat loss at night, which can cut heating demand dramatically.

Running costs are the part buyers underestimate. A heat pump moves heat, so it can deliver several units of warmth per unit of electricity, but it still draws real power for many hours. Estimate by multiplying the unit’s kilowatt draw by the hours it runs each day and your local electricity rate. A solar blanket, a windbreak such as a fence or hedge, and a modest target temperature around 80 degrees all cut the hours the heater needs to run.

Our Picks Reviewed

Hayward HeatPro Heat Pump

Hayward is among the largest names in pool equipment, and HeatPro is a straightforward heat pump designation. It represents the mainstream path for homeowners who want an electric heater from a brand that dealers recognize.

• Pro: a major brand means a broad network of installers and replacement parts.
• Pro: heat pump technology typically costs less to run than resistance heating because it moves heat rather than creating it.
• Con: heat pumps lose output as the air gets cold, so early-spring performance can disappoint in northern climates.

Who should skip it: owners in very cold regions who want rapid heating in winter, who may be better served by a different heat source.

Pentair UltraTemp Heat Pump

Pentair is another large equipment brand, and UltraTemp is an established model name in the heat pump category. Choosing it is a way to stay within a brand ecosystem if you already own other Pentair gear.

• Pro: brand overlap simplifies service and control if your pump and filter come from the same maker.
• Pro: electric heat pumps do not need a gas line or fuel storage.
• Con: the upfront cost of a heat pump is usually higher than a comparable gas heater.

Who should skip it: pool owners who only need to heat a spa occasionally, where a faster resistance or gas heater may be more practical.

Raypak Crosswind Heat Pump

Raypak has a long history in pool heating, and Crosswind hints at an airflow configuration design. It is another full-size heat pump option for residential pools.

• Pro: another established brand widens your choices when comparing dealer quotes.
• Pro: electric operation avoids on-site combustion, which simplifies venting requirements.
• Con: heat pumps heat slowly compared with gas, so plan to warm the pool days ahead.

Who should skip it: people who host last-minute pool parties and expect fast heating.

AquaCal TropiCal Heat Pump

AquaCal specializes in heat pumps, and TropiCal in the name suggests warm-water goals. It appeals to owners who want to extend the swim season.

• Pro: a heat pump specialist often pays closer attention to efficiency details.
• Pro: electric heating can extend the usable season by weeks on either side of summer.
• Con: specialist brands may have fewer local installers than the largest equipment makers.

Who should skip it: homeowners who want to buy from a big-box dealer with a nearby service desk.

Hayward EnergyLine Pro Heat Pump

EnergyLine Pro puts energy in the product name, which signals an efficiency-first positioning. It is a Hayward heat pump line for owners who track running costs.

• Pro: an efficiency-oriented line is a logical choice for pools that run a long season.
• Pro: pairing it with a cover and a variable-speed pump compounds the savings.
• Con: efficiency-focused models can carry a higher purchase cost than basic options.

Who should skip it: owners of seasonal pools used only a few weeks a year, where payback would take too long.

FibroPool FH055 Heat Pump

FibroPool is a smaller name than the big equipment makers, and the FH055 code identifies a specific size class. It is a lower-profile alternative for shoppers comparing options.

• Pro: adds another point of comparison when collecting dealer quotes.
• Pro: a model number makes it easy to match against the maker’s sizing chart.
• Con: lesser-known brands may mean fewer local technicians, so confirm warranty and service before buying.

Who should skip it: those who prioritize easy local support above all else.

Which One Fits

Your climate is the deciding factor. In the Sun Belt, almost any heat pump will carry the pool through the shoulder seasons with ease, so brand, service, and warranty become the main differences. In regions with cold springs, efficiency at low air temperature and a correctly sized unit matter far more than the logo on the cabinet, and some owners decide that a heat pump alone will not satisfy an early-season swimming goal.

Usage habits matter as well. A family that swims daily from May to September benefits from a larger, efficient unit that holds a steady temperature. An owner who swims on weekends may be happy with a smaller unit and a plan to warm the water a day before use. Ask installers for a written estimate of heat-up time and monthly running cost for your specific pool before deciding.

• Standard backyard pool with a mainstream brand preference: Hayward HeatPro or Pentair UltraTemp.
• Comparing multiple dealer quotes: Raypak Crosswind.
• Long swim season: AquaCal TropiCal or Hayward EnergyLine Pro.
• Value-minded shopping: FibroPool FH055.

If you are also adding a backyard sauna or want to compare other electric heat sources, the electric sauna heater guide covers a different kind of warm-up.

Before signing off on any quote, ask the installer whether the price covers the electrical work, the plumbing bypass, and the pad, since these extras can change the total more than the difference between two brands.

Common Mistakes

1. Buying an undersized heat pump. Check gallons and the desired temperature rise.
2. Skipping a pool cover, which loses most of the warmth overnight.
3. Forgetting the electrical upgrade. A dedicated high-voltage circuit is usually required.
4. Placing the unit in a cramped corner that blocks airflow and cuts performance.
5. Expecting a heat pump to work well in freezing weather.

Maintenance is light but not zero. Keep leaves and grass clippings away from the air intake, rinse the coil gently with a garden hose when it collects dust, and have the unit serviced on the schedule in the manual. In regions with freezing winters, drain the heater or follow the winterizing steps so water left in the heat exchanger cannot crack it. A cover designed for the cabinet helps in the off season, as long as it allows air to circulate.

FAQ

Are electric pool heaters cheaper to run than gas?

Heat pumps usually are, particularly in mild climates, because they move heat instead of burning fuel.

How long does it take to heat a pool?

Typically a day or more, depending on pool size, starting temperature, and weather. Plan ahead rather than expecting same-day results.

Do I need a special electrician?

Yes, a licensed electrician should size the circuit and wire the disconnect. For general home heating ideas, see the energy-efficient heater guide.

Will it work in winter?

Output falls as air temperature drops, and many pump models stop below a set temperature.

Can a pool heater share a circuit?

No. Pool heaters should have a dedicated circuit. For other humid-space equipment, consult the Energy Star dehumidifier roundup if you have an indoor pool room.