Best Electric Pool Heater (2026): Heat Pumps Sized for Your Pool
Accessories
The best electric pool heater is a heat pump sized to your gallons, not the biggest BTU number you can afford. A 10-degree lift is a fixed amount of heat, so here are the hours and the cost for 5,000, 15,000, and 33,000 gallons.
Our picks
An electric pool heater is almost always a heat pump. It pulls warmth out of the outdoor air and pushes it into the water, which is why it can heat a pool for a fraction of what a resistance element or a gas burner costs to run. The unit moves heat rather than generating it, and that is what keeps the running cost down.
For most backyard pools, the pick is the Aquastrong HEX016. Step up to the TURBRO Beluga B50V for a mid-size pool that wants inverter quiet, or the Varpoolfaye 120,000 BTU inverter for a large in-ground pool.
That is also why sizing matters more here than anywhere else on the equipment pad. A heater that is too small runs all day and never catches up. A heater that is too big short-cycles and wastes the efficiency you paid for. The three picks below cover the common pool sizes without asking you to guess.
This guide sits with the pool accessories gear, next to the best pool skimmer and the pool heat pump brand guide. If you already know you want a heat pump and just want the brand comparison, start there. If you are sizing one for the first time, stay here.
How to size an electric pool heater before you buy
Three numbers decide the unit: your pool volume, your power at the pad, and how much of the season you actually swim.
Gallons first. Start with the maker's gallon rating. The 120V Aquastrong HEX016 covers above-ground pools up to 5,000 gallons, the TURBRO Beluga B50V covers up to 15,000, and the Varpoolfaye 120,000 BTU unit covers a large in-ground pool up to about 33,000 gallons. Quick-warm sizing guides often use about 5,000 BTU per 1,000 gallons. Maker bands run lower because they assume a covered pool. Add extra capacity if the pool sits in wind or shade.
Voltage second. Small above-ground heaters often run on 120V, which means a normal outdoor outlet and a simple install. Bigger units need a dedicated 220-240V circuit and an electrician. That electrical work is part of the real price, so budget for it.
Season length third. If you want to swim in May and October, size up and plan on a cover. If you only want to take the chill off in July, a smaller unit is enough. Keeping water warm is much easier than warming cold water, so plan on a cover.
How many BTU does a 5,000-gallon pool need?
A maker like Aquastrong rates a 16,000 BTU unit for above-ground pools up to 5,000 gallons. Quick-warm guides often quote about 5,000 BTU per 1,000 gallons, or 25,000 BTU for 5,000 gallons, but that assumes you want a fast climb with no cover.
Can a 120V heater keep up with a larger pool?
No. A 120V unit like the HEX016 is built for small water, roughly 5,000 gallons and under. A 15,000-gallon pool wants a 220-240V cabinet, and a 30,000-gallon in-ground pool wants a 120,000 BTU class unit. Pushing a small unit past its gallons just makes it run all day and never catch up.
How many hours does a 10-degree lift take?
A degree of water is a fixed amount of heat, so the arithmetic is the same for every pool. One gallon of water weighs 8.34 pounds, and one BTU raises one pound one degree. Ten degrees on 15,000 gallons is therefore 1.25 million BTU, and the cabinet's output decides how long that takes.
Those hours assume no heat loss, which is why a cover changes the experience so much. An open pool sheds heat all night, so a heater that can do the job in 14 daylight hours may need two days of running to make the same gain on an uncovered pool in cool weather.
What is the best electric pool heater for a 20,000 gallon pool?
The Varpoolfaye 120,000 BTU inverter. At 120,000 BTU it lifts 20,000 gallons 10 degrees in about 14 hours of running, and it is the first pick here rated past 15,000 gallons. Expect to pay for 220V service at the pad.
Can a heat pump be too big for a pool?
Yes, but only at the small end. An oversized single-speed unit slams to setpoint and short-cycles, which wastes the efficiency you paid for. An inverter modulates instead, so a slightly large inverter cabinet is a mild waste of money rather than a fault.
At the other end, a unit that is too small is worse. It runs all day, never catches up, and the pump and the compressor both wear for nothing. That is why the gallon band on the label is the first number to check and the BTU is the second.
Best for above-ground pools: Aquastrong HEX016
The Aquastrong HEX016 (12' x 14' x 48") is the pick for most above-ground and smaller in-ground pools, at $509.14 today. At 120V it installs without a new circuit, and it both heats and cools, so a hot stretch in August does not leave you with a one-trick machine. The display is readable, and setpoint holds within a couple of degrees.
The pool forums back this up: it warms a well-matched pool steadily rather than instantly, and it rewards a cover. On a 24-foot above-ground pool, one owner said it was great at taking the chill off and noted that adding a dome cover helped it work more efficiently.
Buy it if you have an above-ground pool up to roughly 6,500 gallons, you want a simple 120V install, and you already own or plan to buy a solar cover. Skip it if your pool is large in-ground, where the BTU math needs a bigger cabinet and 220V.
Best inverter for mid-size pools: TURBRO Beluga B50V
The TURBRO Beluga B50V 50,000 BTU is the pick when your pool sits in the middle and you care about how the pad sounds, at $1,749.00 today. Full DC inverter control means soft starts and low-speed holds instead of full-power bursts, and the titanium exchanger is built for treated water. It heats to 104F and cools down to the mid 40s.
TURBRO rates the Beluga with a COP that climbs well into double digits, but those numbers come from lab conditions. In the yard, efficiency tracks air temperature, humidity, and run time, which is why a cover and a sensible schedule still matter. The brand lists a 2-year unit warranty and a 5-year compressor warranty, extended by registration.
Buy it if your pool is roughly 8,000 to 15,000 gallons, you have a 220-240V circuit at the pad, and you want quiet, steady heat. Skip it if you need fast heat in cold air, where gas still wins, or if the pad has no room for airflow around the cabinet.
Best for large in-ground pools: Varpoolfaye 120,000 BTU
The Varpoolfaye 120,000 BTU Inverter is the pick for a large in-ground pool, up to about 33,000 gallons, at $3,299.99 today. Inverter control stretches the compressor life and softens the power draw, the exchanger handles both freshwater and salt, and the app lets you adjust temperature and schedule run times from the house.
The noise claim sits around 47 dB, which is about the level of a quiet room, and the unit lists both heating and cooling modes. The install guide is thin for a cabinet this size, so line up an electrician who has done a pool pad before.
Buy it if you are heating a big in-ground pool, you want app control and salt compatibility, and you have 220V service at the pad. Skip it if your pool is small, where the price and the electrical work are more heater than you need.
Electric, gas, or solar: which one fits your season
If your goal is a longer season at a predictable monthly cost, a heat pump is the right tool. If you want to swim tonight after a cold snap, look at gas. If you have sun and space, solar can carry the shoulder months for almost nothing.
Why does a heat pump slow down in cool air?
A heat pump pulls warmth from the outdoor air, so the colder the air, the less heat there is to move. Most units do their best work above about 55F to 60F, and below that they spend more time in defrost. Warm-up slows down, but the heater keeps working.
Do Hayward and Raypak make electric pool heaters?
Both companies build pool heaters, and most of what either sells at retail is gas. Hayward has sold heat pumps under its own line and Raypak's catalog leans gas and commercial. At these gallon bands the badge tells you less than the rating and the noise spec.
What raises an electric heater's running cost
The heater is only part of the bill. The pump that feeds it, the cover you do or do not use, and the temperature you ask for all move the number more than the brand on the cabinet.
Does a cover really cut the bill?
Yes, and it is the biggest lever you control. An open pool loses most of its heat overnight to evaporation. A solar cover traps that heat and can cut the heater's run time noticeably, which is why every pick here rewards a covered pool.
How much does a 10-degree lift cost?
About $10 on a 15,000-gallon pool. A 10-degree lift is 1.25 million BTU, which is 366 kWh of heat, and at a COP of 6 the compressor draws about 61 kWh. At 17 cents a kWh that is $10.37, with a cover on the pool.
That number is the one to hold on to when you compare an electric heater with a gas one. Gas wins on speed in cold air, but the fuel is the expensive part, and a heat pump's whole advantage is that it moves heat instead of making it.
Pump speed and run time. A heat pump needs a minimum flow to run without erroring out. Pair it with a variable speed pump so you can hold that flow without paying for full speed all day.
Your setpoint. Every degree you raise the target costs run time. Holding 82F instead of 86F is a smaller bill for the same enjoyable pool. Pick a comfortable target instead of chasing a number.
What to skip
Skip a resistance-style electric heater for a whole pool. It has a COP of about 1.0, meaning you pay for every unit of heat directly, and the monthly bill reflects that. For an electric whole-pool heater, a heat pump is the pick.
Skip a unit that is oversized for your gallons. A heater that slams to setpoint and shuts off is short-cycling, and that wastes the efficiency you paid for. Match the BTU to the water.
Skip the "attach it to the existing pump and hope" install. These units want a dedicated circuit at the pad and the right flow rate. Get the electrical and plumbing right once, then enjoy the season.
Bottom line
Buy the Aquastrong HEX016 for an above-ground or smaller in-ground pool and a simple 120V install. Buy the TURBRO Beluga B50V for a mid-size pool where quiet inverter heat matters. Buy the Varpoolfaye 120,000 BTU inverter for a large in-ground pool with 220V at the pad.
Size to your gallons, add a cover, and run the pump efficiently. The heater will do the rest.
Frequently Asked Questions
What is the best electric pool heater for a 20,000 gallon pool?
The Varpoolfaye 120,000 BTU inverter. A 20,000-gallon pool needs about 1,668,000 BTU to come up 10 degrees, which is roughly 14 hours at that output. The 120,000 BTU cabinet is the smallest one in this group rated past 15,000 gallons, and an inverter modulates down rather than short-cycling.
Are Hayward or Raypak pool heaters better?
For a heat pump, the brand question matters less than the gallons. Both companies are best known for gas heaters, which is most of their retail catalog. Neither pick here is a Hayward or Raypak, because the inverter heat pumps in these gallon bands come from smaller brands, so compare cabinets by rating and noise instead of by badge.
How much does it cost to run an electric pool heater?
About $10 of electricity for a 10-degree lift on a 15,000-gallon pool. That lift is 1.25 million BTU, which is 366 kWh of heat, and at a heat pump's typical COP of 6 it draws about 61 kWh. At 17 cents a kWh that is $10.37.
What is the most efficient electric pool heater?
A heat pump, not a resistance element. A heat pump moves heat from the outdoor air into the water, so it can deliver several units of heat per unit of electricity. The TURBRO Beluga B50V is the inverter pick here, and inverter models hold temperature at low speed instead of cycling at full power. Real efficiency still depends on air temperature, humidity, and how long you run it.
How many BTU do I need for my pool size?
Sizing is usually quoted in gallons by the maker. The 120V Aquastrong HEX016 is rated for above-ground pools up to 5,000 gallons, the 50,000 BTU TURBRO Beluga B50V for up to 15,000 gallons, and the 120,000 BTU Varpoolfaye for in-ground pools up to about 33,000 gallons. Quick-warm guides often use about 5,000 BTU per 1,000 gallons, but maker bands run lower because they assume a covered pool, so treat the gallon rating as the real target.
Are electric pool heaters better than gas?
They are cheaper to run for long, steady holds and they do not need a gas line. Gas still wins when you need a fast temperature jump in cool air. Our gas pool heater guide covers that lane.
Do electric pool heaters work in cold weather?
They slow down as the air cools. Most heat pumps do their best work when outdoor air is above about 55F to 60F, and they spend more time in defrost below that. They stretch a swim season, they do not replace a hot tub.
How long does an electric heater take to warm a pool?
Plan on a steady climb, not an instant jump. On a 5,000-gallon pool a smaller 120V unit can take a couple of days to reach target, and a covered pool holds the gain far better than an open one. Size the unit to the gallons first, then let the cover do the rest.
Is 120V or 220V better for a pool heat pump?
Match the voltage to the unit. Smaller above-ground heaters often run on 120V, which keeps the install simple. Larger in-ground units generally need a dedicated 220-240V circuit and an electrician, so budget for that before you order.
How loud is a pool heat pump?
Quieter than a gas heater, and inverter models are the quietest of the group because they idle at low speed once the water is warm. Makers quote operating noise in the high 30s to high 40s of decibels, close to a quiet conversation.