Electric Pool Heaters for Inground Pools

Skip to products

Electric pool heaters for in-ground pools are air-source heat pumps - they use electricity to extract heat from the surrounding air and transfer it into your pool water, with no gas line or combustion venting required. Operating costs run 50 to 80% lower per BTU than propane or natural gas heaters in moderate climates, making them the most economical choice for pools used regularly through a long swim season. This collection includes models from AquaCal, FibroPool, GulfStream, Hayward, and Madimack, covering in-ground pools from 7,500 to 35,000 gallons.

How Electric In-Ground Pool Heaters Work

Unlike a gas heater that burns fuel to generate heat, an electric pool heat pump runs a refrigerant cycle similar to an air conditioner in reverse. The unit pulls heat from ambient air - even air as cool as 40 to 50 degrees F depending on the model - compresses it, and transfers it to the pool water via a heat exchanger. For every unit of electricity consumed, a heat pump typically delivers 3 to 6 units of heat output, which is why operating costs are so much lower than combustion-based heating. The tradeoff is recovery speed: heat pumps raise water temperature more slowly than gas heaters, typically 1 to 2 degrees F per hour, so they work best for maintaining temperature on a regularly used pool rather than heating from cold on demand.

Choosing the Right Size Electric Heater for Your In-Ground Pool

Sizing an electric heat pump for an in-ground pool depends on pool surface area, target temperature, climate, and whether the pool is covered. The larger the surface area and the greater the difference between ambient temperature and target pool temperature, the more BTUs you need. As a general guide for warm climates:

**Electric In-Ground Pool Heater BTU Sizing Guide**
BTU Output	Pool Size (Warm Climate)	Typical Application
32,000 - 70,000 BTU	Up to 15,000 gallons	Smaller in-ground pools, plunge pools
80,000 - 100,000 BTU	Up to 20,000 gallons	Mid-size residential in-ground
100,000 - 125,000 BTU	Up to 25,000 gallons	Standard residential in-ground
125,000 - 142,000 BTU	Up to 35,000 gallons	Larger in-ground pools

In colder climates or for uncovered pools, size up at least one tier. If you also want to cool the pool in summer, check the heat-and-cool section below -- most models in this collection include cooling capability.

Heat-and-Cool In-Ground Pool Heat Pumps

The majority of models in this collection both heat and cool. In Florida and similar warm climates, summer pool water can reach the low 90s - cooling capability lets you bring that down to a comfortable range without any additional equipment. Heat-only models are available at a lower price point and work well if you are primarily extending your swim season rather than managing summer heat. If cooling is your primary goal, see our pool heater chiller collection for dedicated cooling options.

Electric In-Ground Pool Heater vs. Gas Heater - Key Differences

The main advantage of an electric heat pump over a gas heater is operating cost. In moderate climates, a heat pump delivers heat at a fraction of the cost of propane or natural gas. The main disadvantage is recovery speed and cold-weather performance. Gas heaters maintain full output at any air temperature and heat pools significantly faster from cold. For pools used consistently through a warm swim season, an electric heat pump is almost always the lower operating cost choice. For pools that sit unused for long periods or need fast heat-up, a gas heater or a gas and heat pump combination may be more practical. Browse our pool gas heaters collection to compare options.

Frequently Asked Questions

Are "electric pool heaters" the same as pool heat pumps?

Yes, in most cases. When people search for an electric pool heater for an in-ground pool, they are almost always looking for a heat pump. True resistance electric heaters (which convert electricity directly to heat like a space heater) exist but are rarely used for full-size pools due to very high operating costs. All products in this collection are air-source heat pumps powered by electricity.

How long does it take an electric heat pump to heat an in-ground pool?

A correctly sized heat pump typically raises pool temperature 1 to 2 degrees F per hour under good conditions. A 20,000 gallon pool starting at 65°F and targeting 82°F could take 8 to 17 hours of continuous run time. Heat pumps work best as temperature maintenance equipment rather than fast-recovery heaters. If you need to heat from cold quickly, a gas heater will do it faster.

Do these units work in cold weather?

Most models in this collection have a minimum operating temperature between 40 and 50 degrees F. Efficiency drops as temperatures approach that minimum. Check each product page for the specific minimum operating temperature. For sustained cold weather heating, a gas heater does not have this limitation.

What electrical service do these units require?

Many models in this collection require 220/240V single-phase service. Breaker size varies by model and BTU output - confirm your panel can support the unit before purchasing. Installation must be performed by a licensed electrician.

Do you offer installation?

Yes. Visit our installation page for details on connecting with a qualified installer in your area.