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How Many Btu For Pool Heater

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The Customers Ideal Water Temperature

How To: Size a Gas Heater for Your Swimming Pool

You need to identify what temperature your customers prefer to swim at .

This establishes what performance you expect your heater to maintain under different environmental conditions. For example, if a pool has an attached hot tub, the maximum water temperature for calculating Btu requirements would be as high as 104 degrees Fahrenheit.

What Size Heat Pump Do I Need For A 1600 Square Foot Home

Sizing a Heat Pump Typical home sizes range from 1 1/2- to 5-ton capacity. Though sizing a system should be handled by a professional, you can get a rough idea of size by figuring about 400 square feet of living space per ton in older houses, so, a 1,600-square-foot house would normally require about a 4-ton system.

Editors Picks : Best 400k Btu Pool Heaters

Most of these pool heaters are available in Natural Gas & Propane

Raypak : 406,000 BTU / NG

  • Compact design : Provides you with more options for installation.

DOCUMENTS for the Pentair MasterTemp series:


If you need a heavy-duty heater for your swimming pool the Pentair 460805 MasterTemp wont let you down. Its rock solid externally and internally. The shell of the pool heater can handle extreme hot and cold conditions, plus its rustproof and will always look fantastic. Its a huge positive because you dont want it affecting the aesthetics of your garden.

On the inside, its got a few features to protect the heater including the popular cupronickel heat exchanger. A water pressure switch wont let the unit overheat if there is a problem with your pool. If the water temperature exceeds factory setting limits it will automatically shut itself off. Youll need to also keep an eye on the pool pH levels to extend the lifetime of the heat exchanger.

Diagram showing how Pentair MasterTemp Pool Heaters work

Learn more about MasterTemp pool heaters by visiting the Pentair site.

VIDEO | Behind the Scenes Working at Hayward

400,000 BTU Pool Heater Natural Gas

Also available in propane : Hayward H400FDP


  • Low NOx emissions meets clean air quality standards

View or download the MANUAL and the BROCHURE for the Hayward H400FDN.


TRANE TR400NA : Discontinued

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How Many Btu Do I Need To Heat My Inground Pool

Pool Size
Up To 10,000 Gallons 12′ x 24′ 50,000 BTU
Up To 15,000 Gallons 14′ x 28′ 85,000 BTU
Up To 20,000 Gallons 16′ x 32′ 85,000 BTU
Up To 25,000 Gallons 18′ x 36′ 110,000 BTU

Step 2: Divide your Surface Area by 3 Therefore, the minimum size heater that is recommended for a 15 x 30 pool is 150,000 BTUs. Keep in mind, this is simply the recommended minimum size.

Subsequently, question is, what is the best pool heater for inground pools? Top 10 Best Pool Heaters:

  • Hayward H400FDN Pool Heater Best Overall.
  • Hayward HeatPro Titanium Best Electric Pool Heater.
  • EcoSmart Electric Pool Heater Best Value.
  • Hayward Above-Ground Pool Heaters.
  • Smartpool Inground Sun Pool Heater.
  • Raypak Gas Pool-Heater.
  • FibroPool FH055 Pool Heater.
  • People also ask, how many BTUs do I need for my inground pool?

    In-ground pools and spa general run from 100K to 400K BTU. For an average 15′ x 30′ pool , a 300K BTU heater would raise your pool temperature 2 degrees per hour a 400K BTU heater, 2.7 degrees per hour.

    How many BTUs do I need?

    Size and Ceiling Height

    Area To Be Cooled Capacity Needed
    100 to 150
    Pool Size
    Up To 15,000 Gallons 14′ x 28′ 85,000 BTU
    Up To 20,000 Gallons 16′ x 32′ 85,000 BTU
    Up To 25,000 Gallons 18′ x 36′ 110,000 BTU
    Up To 30,000 Gallons 20′ x 40′ 125,000 BTU

    What Is A Cop

    Jandy LXi Low NOx Pool Heater

    What does COP stand for? You probably read this quite often on the sides of pool heat pumps and typical air conditioning systems. While conventional heaters only achieve efficiencies of about 75%, a heat pump delivers on average about 5 times the heat absorbed. Nearly 80% of the energy needed to heat the pool comes from the ambient air. With the newest inverter models this efficiency can be up to a COP of 15 depending on humidity and temperature.

    A COP is in direct relationship with ambient air temperature and humidity because a heat pump extracts the heat from the air. Here is an Example of a COP chart taken directly from our testing facility of the Elite 11kW

    For example, with a COP of 5 – 1kW of electricity consumed, creates 5kW of heat released into the pool.

    In an example, if we warm our 40m³ pool by 10 ° C with a running time of 40 hours . For this we need a heat pump with an output of approx. 13.94 kW.

    A heat pump should have about 1/5 lower power consumption = 13.94 ÷ 5 = 2.79 kW input

    The relationship between the power supplied by the heat pump to the pool and the power it consumes is determined by means of the so-called COP factor . The higher the COP value of the pump, the more powerful it is and the lower your electricity bill.

    are increasingly being installed in the private sector in order to achieve an even more cost-effective power supply. Anyone who has such a system can use a heat pump very economically.

    Also Check: Is The Pool Open At Winstar

    Size Really Does Matter

    Contrary to what women say, size really does matter at least, as far as swimming pool heaters go.

    Correct pool heater sizing can be slightly tricky, but it mainly comes down to this: large heaters will heat quickly, whereas smaller heaters take more time to distribute heat throughout the pool. The choice is yours.

    How To Size A Pool Heater

    Whenever I talk to another pool professional about calculating heater size, I usually see their eyes glaze over. Not that sizing a pool heater is super difficult, but if you want to do it right, you need to do some calculations first.

    Similar to pumps, sizing heaters isnt usually calculated. Its usually a matter of picking a model youve used in similar applications. For example, if youre working on a pool with an attached hot tub, most installers would suggest a 400,000-Btu heater, which is the largest available in most residential applications.

    In that case, a pro might not feel he or she needs to run the calculations because they know the attached hot tub, circulated at pool temperature, will need to be heated before use. And the higher the Btu output of the heater, the faster the heater will raise the water from pool temperature to spa temperature.

    Nobody wants to turn on their spa two hours in advance just for it to warm up. With a giant 400,000-Btu heater, an average 8-by-8-foot spa could go from 80 degrees up to 104 degrees in about an hour.

    Similarly, when a homeowner asks what size heater they should use, most installers just pick their favorite heater that is between 200,000 and 350,000 Btu, knowing from experience that it will work on a pool approximately the size of the one in question.

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    Choosing The Right Pool Heat Pump For Your Pool Size

    The performance data is based on the following calculation basis

    C x VX P = ————————-

    P Performance of swimming pool heat pump

    C heat storage coefficient of water = 4.186

    V Pool volume

    T1 Start temperature

    H Heat up time

    The maximum heating time should be 4 hours per 1 ° C water temperature. This is calculated by the heat loss during the night being up to 2°C meaning it would take 8 hours to heat up to full temperature maintaining a constant temp throughout the season.


    Say you have a swimming pool with 40m³ of water and an initial temperature of 18 ° C.

    You want to heat the water to 28 ° C. The maximum heating time should be 4 hours per 1 ° C water temperature. Consequently, it takes 40 hours to heat up your 40m³ pool by 10 ° C.

    This results in the following formula:

    4.186 x 40 x P = ———————— = 52.33kW

    What Else Do You Need To Know About A Heat Pump

    How I installed plumbing and a 125k BTU Pentair pool heater for a 24 ft above ground pool.

    The choice of location is also very important because the heat pump needs very large amounts of air to function properly! For this, a suitable place for the fresh air must be found in most cases indoor operation does not work.

    The heat pump itself is then integrated directly into the filter circuit, after the filter system and before the chlorinator if fitted.

    High-quality heat pumps are equipped with corrosion-protected heat exchangers and can thus heat any swimming pool water, whether it is cared for with chlorine, bromine, ozone or chlorine-free products. The use for pools with sea water is also possible.

    With all pools other factors including solar gains, wind factors and evaporation losses need to be taken into consideration. This article is to give a bit of insight on one way of sizing.

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    Sizing A Heat Pump Pool Heater

    You should have a trained pool professional perform a proper sizing analysis for your specific swimming pool to determine pool heater size.

    Sizing a heat pump pool heater involves many factors. Basically, a heater is sized according to the surface area of the pool and the difference between the pool and the average air temperatures. Other factors also affect the heating load for outdoor pools, such as wind exposure, humidity levels, and cool night temperatures. Therefore, pools located in areas with higher average wind speeds at the pool surface, lower humidity, and cool nights will require a larger heater.

    Heat pump pool heaters are rated by Btu output and horsepower . Standard sizes include 3.5 hp/75,000 Btu, 5 hp/100,000 Btu, and 6 hp/125,000 Btu.

    To calculate an approximate heater size for an outdoor swimming pool, follow these steps:

  • Determine your desired swimming pool temperature.
  • Determine the average temperature for the coldest month of pool use.
  • Subtract the average temperature for the coldest month from the desired pool temperature. This will give you the temperature rise needed.
  • Calculate the pool surface area in square feet.
  • Use the following formula to determine the Btu/hour output requirement of the heater:
  • Pool Area x Temperature Rise x 12

    This formula is based on 1º to 1-1/4ºF temperature rise per hour and a 3-1/2 mile per hour average wind at the pool surface. For a 1-1/2ºF rise multiply by 1.5. For a 2ºF rise multiply by 2.0.

    Sizing A Swimming Pool Heat Pump

    Pool heat pumps are typically matched to the number of gallons in your pool. If you dont know or arent sure how many gallons you have, measure your pool, and use this pool volume calculator tool.

    Some heat pump manufacturers dont list the gallons, but list their heaters in terms of the BTU output. Most models are in the range of 50K BTUs to 125K BTUs.

    50K BTU heat pumps are meant for small pools, or aboveground pools, under 12,000 gallons. It will work on larger pools, but heating will be slow and total temperature rise may not be what you desire.

    Youll need to consider pool size and the desired temperature change when selecting a heat pump for your swimming pool. Other factors such as the average air temperature, humidity and wind speeds will also influence a heat pumps ability to warm the pool water. Figuring on a temperature increase of 1-1.25 degrees per hour, you can use the following equation to get an approximate heat pump BTU requirement:

    x x 12 =

    For example, well use a rectangular pool 14 ft. wide by 28 ft. long. During the coldest month of use, the pool owner wants to increase the water temperature by around 20 degrees Fahrenheit.

    x 20 x 12 = 94,000+ BTU

    If you happen to know the volume of your pool in gallons, you can also follow this general guideline for heat pump BTUs:

    Pool Volume

    Also Check: Aria Hotel Pool Hours

    The Volume Of The Pool

    The volume of a straight-walled pool can be loosely calculated using this formula :

    average length x average width x average depth x 7.5 = volume in gallons

    If youre working with a freeform pool , heres a slightly more accurate formula:

    average length x average width x average depth x 7 = volume in gallons

    What Size Pool Heater Do I Need An Easy Guide To Sizing


    Would you like to extend the swimming season in your swimming pool? Maybe open it a month or two earlier and close it a month or two later? Wouldnt it be great to have it available for more than just a few months in the summer?

    Well, you can. But no one wants to swim in ice water unless youre a member of the Coney Island Polar Bear Club and you like torturing yourself in freezing cold water so, to extend the swimming season, you need to heat the water. But what size what heater do you need?

    Thats what were here for. Weve already done all the hard work for you, so just sit back, receive our words of wisdom, and youll be able to make an informed decision on the heater thats best for you.

    Also Check: Vdara Hotel Pool

    Raypak Residential Gas Heater Sizing

    The really cool thing about technology is that it makes all of our lives easier. Raypak has a handy-dandy gas heater calculator that configures your city and state with your desired water temperature, average air temperature, and desired temperature rise. This online calculator allows pool owners to input really specific information about their pool and location and configure what size heater is best, not only for their pool but taking your physical location into consideration as well.

    The calculator also has the ability to calculate the cost of natural gas and propane. This tool allows customers to compare energy costs and discover which unit is truly right for them. It goes much further than I could ever tell you, thats for sure.

    Rules For Sizing Your Heat Pump Pool Heater

    • Size at 4 BTUs per gallon or 1 BTU per litre of water. To heat in normal summer conditions when ambient air temperature average 70°F in a 24 hour period.
    • Size at 5 BTUs per gallon or 1.3 to 1.5 BTUs per litre of water. To heat in normal spring and fall conditions when ambient air temperature average 60°F in a 24 hour period.
    • Size at 6 BTUs per gallon or 1.5 BTUs per litre of water. To heat in normal spring and fall conditions when ambient air temperature average less then 60°F in a 24 hour period.

    We recommend the use of a pool cover during chilly periods.

    Also Check: Costco Swimming Pool Supplies

    Pool Heating Pump Systems: How To Calculate Heat Loss And Heater Size

    This Blog post goes in a bit of detail the complex calculations we provide for you with our instant online pool heater calculator.

    This report is the gold standard of pool heater sizing and heating evaluation and will provide you with all you need to know to get your pool heated.

    Continuing from last weeks post where I explained how pool heat pumps being the most efficient way of heating a pool, I mention to speak to experts on how to calculate the heating requirement. This week I delve a little deeper into the technical aspects of pool heating pump Explaining COP, heat up times and kW required. So put your thinking cap on and continue reading, maybe you’ll be an expert by the end.

    Solar Pool Heater Sizing

    Swimming Pool Heater Guide

    One of the most environmentally practical methods for heating your pool is through solar energy. Solar pool heating is when solar panels connect to your pools heater and absorb the suns energy to power the heating element. You will need to make sure you have adequate sun exposure to the solar pool heater for optimal results. After all, a solar pool heater with no sun will be ineffective.For best results of your solar pool heater, the solar panels need optimal sun exposure of at least 4 6 hours of constant sunlight. Do you have an above ground pool? A solar pool heater would be a good choice due to the amount of depth that an above ground pool lacks.

    For best results of your solar pool heater, the solar panels need optimal sun exposure of at least 4 6 hours of constant sunlight. Do you have an above ground pool?

    A solar pool heater would be a good choice due to the amount of depth that an above ground pool lacks.

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    Advantages Of Using A Pool Heat Pump

    • No emissions, and very low energy use
    • Reliable heater, requires no maintenance
    • No dangerous gas or flames used
    • Easy to install, operate and troubleshoot
    • Highly efficient, cheap to operate.

    This blog post is a Buyers Guide to help you select the best pool heat pump for your pool size and usage patterns, and answer some questions about heat pumps along the way:

  • Energy Saver
  • Heat Pump Pool Heaters
  • Aheat pump is a device that uses a small amount of energy to move heat from one location to another. Heat pumps used for heating pools transfer heat from the outdoors into the water. Because they use heat that is already available and just move it from one place to another, they use less electricity.

    What Size Tank Do I Need

    For a standard size pool most pool heaters are 300,000 400,000 BTU . Because of this you will need at least a 200 gallons of propane to satisfy the amount of pressure to run these heaters. This can be accomplished a few ways. One way is with 2-100 above ground gallons tanks, this is probably the most common application for pool heat. Another option is 1- 250 above ground gallon horizontal tank. Another option would be to install a 500 gallon or 1000 gallon underground tank. This option is much more costly, but is less of an eye sore. If you intend to heat your pool regularly this might be the most expensive option upfront but could actually save you money in the long run.

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