How do you size a pool heater
Andrew Campbell
Published May 21, 2026
One of the important parts of putting in a pool heater is making sure it is the correct size to maintain the comfortable temperature you want. … However, there is no such thing as oversizing a pool heater. The larger the heater’s output, the faster it heats the water in the pool, and it will not begin short-cycling.
Can you over size a pool heater?
One of the important parts of putting in a pool heater is making sure it is the correct size to maintain the comfortable temperature you want. … However, there is no such thing as oversizing a pool heater. The larger the heater’s output, the faster it heats the water in the pool, and it will not begin short-cycling.
What size pool heater do I need for a 40000 gallon pool?
A 400,000 btu pool heater is ideal for pools over 40,000 gallons. But you should also know that it’s always better to buy a larger pool heater so you’re…
What size water heater do I need for my pool?
The pool’s surface area divided by three gives you the minimal BTU size recommended for that particular surface area. Continuing the example above with the 15 x 30 pool, after dividing by 3, you get 150. Therefore, the minimum size heater that is recommended for a 15 x 30 pool is 150,000 BTUs.How many kW Do I need to heat my pool?
kW power heat pump The heat pump should be able to heat the water by approx. 0.20 – 0.25 degrees per hour. It takes 1.16 Wh to heat one litre of water one degree, which means 11.6 kWh for a 10m³ pool. In other words, one kilowatt hour heats 862 litre of water by one degree Celsius.
What size pool heater do I need for a 10000 gallon pool?
Sizing a gas heater for inground pools is done by first matching pool heater BTU output to pool size in gallons. Or approximately 100K BTU’s for every 10,000 gallons of pool water. For inground pools less than 20,000 gallons, small gas heaters like the Raypak 206K BTU output are suitable.
What size heater do I need for a 24 foot round pool?
Pool Size (Feet)Summer 4 BTU’sExtended 6 BTU’sUp To 10,000 Gallons Up To 21′ Round or 15′ x 26′ Oval50,000 BTU65,000 BTUUp To 13,000 Gallons Up To 24′ Round or 15′ x 30′ Oval50,000 BTU85,000 BTUUp To 17,000 Gallons Up To 27′ Round or 18′ x 33′ Oval65,000 BTU110,000 BTU
How do you size a pool heat exchanger?
Rectangular Pool Capacity = 7.5 x Length (ft) x Width (ft) x Average Depth (ft). Circular Pool Capacity = 5.9 x Diameter2 (ft) x Average Depth (ft).How long does it take to heat a 20000 gallon pool?
You have a 20,000-gallon pool and use a 125,000 BTU heater. Your water is currently 70 degrees F but you would like it to be a minimum of 80 degrees F. How long will it take before the pool water reaches 80 degrees F? 10 x 1.33= 13.34 hours of heating before the pool reaches 80 degrees F.
Which pool heater is best?- Best Overall: Hayward W3H150FDN Universal H-Series 150,000 BTU Pool and Spa Heater, Natural Gas. …
- Best Solar: Smart Pool S601 Pool Solar Heaters. …
- Best Electric: Ecosmart US SMART POOL 27 Electric Tankless Pool Heater. …
- Best Heat Pump: Hayward HeatPro W3HP21004T Pool Heat Pump.
How much is a Jandy pool heater?
Jandy Legacy gas powered pool heaters come in full range of power from 125K to 400K BTU inputs, with 19 models on the market. The prices are starting from the $1400 for the least powerful units and finishing with $3600.
How many gallons does a 27 foot round pool hold?
Above Ground Swimming Pool Water Volumes by Size21 ft Round9,106 gals10,408 gals24 ft Round11,895 gals13,594 gals27 ft Round15,054 gals17,205 gals30 ft Round18,585 gals21,240 gals
How do I calculate gallons in my pool?
Length x width x average depth x 7.5 = volume (in gallons) Length times width gives the surface area of the pool. Multiplying that by the average depth gives the volume in cubic meters. If you’d like to find the pool volume in gallons, multiply your results by 7.5, as there are 7.5 gallons for each cubic foot.
Can you oversize a pool heat pump?
Generally speaking, you should oversize the heat pump as much as possible. You’ll never regret going too big, as doing so means warming the pool at a faster rate without running the heater as much.
How many kW does heat pump use?
Consider that a typical heat pump system uses 3kW – 6kW while running, daily consumption in cold days can easily be 30–60kWh or more. This is why home insulation and air-tightness is such an important way of conserving energy.
Is a bigger pool heat pump better?
Bigger pool heaters are better Although a bigger pool heater usually means more BTU (power), it doesn’t necessarily mean better. A small pool heat pump can heat your pool just as effectively as a large one, and at half the cost. Because it’s really the size of your pool that determines which pool heater size is best.
How many BTUs do I need?
Area To Be Cooled (square feet)Capacity Needed (BTUs per hour)100 to 1505,000150 to 2506,000250 to 3007,000300 to 3508,000
How do I make my above ground pool warmer?
Above ground pools are easily heated with a solar heater. Above ground pools may be easily and safely heated using a combination of a solar heater and a solar cover, keeping your costs down and your family in the pool. So there you have it!
Can you add a heater to an existing inground pool?
Fortunately, there’s an easy solution: just add heat. A pool heater can be one of the best investments you make for your swimming pool. Heaters maintain your preferred pool temperature, and make the water more comfortable. … In some areas, you can even swim year-round.
What is the cheapest way to heat a pool?
- Use a Solar Cover. …
- Invest in Solar Sun Rings. …
- Try Out a Liquid Solar Pool Cover. …
- Build a Windproof Pool Enclosure. …
- Use the Black Hose Trick. …
- Snag a Pool Heat Pump. …
- Combine a Solar Cover and Pool Heat Pump.
Can you add a heater to an above ground pool?
Just like inground pools, above ground pools can have both heat pumps and gas heaters added. Plus installation is a fairly simple and straightforward process.
What is the ideal pool temperature?
What Is the Perfect Temperature? Pool water temperatures typically run between 78 and 82 degrees. Any cooler than 78 and you will feel chilled when you exit the pool. Any warmer than 82 and the pool will feel like bath water.
Should I run pool heater overnight?
When asking can you leave pool heater on overnight, the answer is definitely no if you have no swimming pool cover. … So unless you have money to burn, it’s best not to run your heater at night on an uncovered swimming pool.
Should I leave my pool heater on all the time?
Physicist: The correct answer is always to leave the heater off for as long as possible, as often as possible. The one and only gain from leaving a pool heater on is that it will be warm when you get in. The same is true of all heaters (pool, car, space, whatever).
How does pool heat exchanger work?
A heat exchanger transfers heat from one vessel to another. … The hot gas then travels through the heat exchanger, which heats up the titanium tubing. After that, pool water flows through the pool heat pump heat exchanger, heated as it flows past the tubing.
What is a pool heat exchanger?
A pool heat exchanger uses the hot water from your boiler (or your solar heated water circuit) to heat your pool water. You can use a swimming pool heat exchanger in both chlorinated and saltwater swimming pools, whirlpools, Jacuzzi’s, hot tubs, spas, and solar-heated pools.
How much is a pool heater pump?
Solar PanelsHeat PumpAverage Unit Cost including installation to the pool plumbing$4,000 to $9,000$3,500- $6,500Energy Source Connection Costs$0$1,000-$3,000Total average Upfront Installation Costs$6,500$4,000Annual Operating Costs*$0$1,200
How much is a good pool heater?
While adding a pool heater requires an upfront investment, it helps you maximize your investment by being able to use your pool for much more of the year. Between setup and operating costs, a pool heater costs between $300 and $5,000, with the average cost around $2,000.
What is the largest pool heater?
For pool owners who don’t want to wait and enjoy a heated pool, or need an extra boost of power, 400,000 BTU pool heaters will get the job done in a pinch. These heavy-duty heaters are designed for heating speed and efficiency.
How do you size a Jandy pool heater?
TO SIZE A POOL HEATER: First, determine your pool’s approximate surface area in square feet. Next, determine the desired temperature difference (or “rise”) by subtracting the coldest average air temperature when the pool will first be in use from the desired pool water temperature.
Is Jandy and Zodiac the same company?
Jandy Pool Products is a developer, manufacturer and marketer of innovative pool products sold under the Jandy® brand. Jandy was acquired by Carlyle (80%) and the Zodiac Group (20%) in April 2006.
