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What Size Heat Pump Do I Need For My Pool

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Estimating Heat Pump Swimming Pool Heater Costs And Savings

What size electric heat pump should you get for your pool?

For an outdoor swimming pool, use the following tables to help estimate your annual heat pump pool heater costs and savings compared to using an electric resistance or a gas pool heater.

Table 1 estimates annual swimming heat pump pool heating costs by location, by water temperature, and with or without using a pool cover.

Table 1. Costs by Location of Heating Outdoor Pools with a Heat Pump*


*Based on an electric resistance heated pool, which costs $1,000 per year at an electric cost of $.085/kwh, and using a natural gas cost 0f $.80/therm. A seasonal average COP of 5.0 was used to determine heat pump savings.

What Size Of Pool Heater Do You Need

Pool heaters allow you to open your pool earlier in the spring, and extend the swimming season well into the fall, but they are a large investment, so before running out to buy a pool heater you should spend a little bit of time doing research.

If you dont choose the size of your pool heater careful you could end up spending a lot of time and money down the line.

What you need to consider

Before buying a pool heater there are five basic things that you need to determine:

  • The size of your pool
  • Your heating needs and preferences
  • BTU requirements
  • Whether or not you use a solar cover
  • Environmental considerations.

1) Size of your pool

The larger your pool, the more powerful your heater will need to be, so that means you need to calculate the volume of your pool. To do this, youll have to first find the surface area and then multiply that by the average depth.

To find the surface area:

  • Square and rectangular pools: simple multiply length by width
  • L-shaped pools: break the pool into two rectangles and multiply length and width of each and add the two answers together
  • Round pools multiply the diameter by the diameter and then multiply the answer by pi
  • Oval pools multiply the longest diameter by the shortest diameter for surface area
  • Kidney shaped pools add the longest width and shortest width, and multiply that by the length

For all shapes of pool:

2) Your needs and preferences

3) Know your BTUs

Pool heaters measure their power in BTU .

BTU Needed to raise temperature


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 CooledCapacity 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

    Read Also: Building My Own Inground Pool

    What Size Swimming Pool Heat Pump Do I Need

    BackWhat Size Swimming Pool Heat Pump Do I Need?

    • What Size Swimming Pool Heat Pump Do I Need?

    What Size Swimming Pool Heat Pump Do I Need?

    Heat pumps are one of the most cost-effective ways to heat your pool! Its energy efficiency is unmatched, and the benefits of utilising a heat pump are countless. Here at 1st Direct Pools, to ensure that you select the right product for your pool, we’ve put together this guide that will help you to invest in the perfect sized swimming pool heat pump.

    Installing A Pool Heat Pump

    ComforTemp 125,000 BTU Heat Pump

    Theres not much difference in installation methods among our pool heat pumps. There are some size considerations, so if you have a smaller space, look to the product dimensions in the brochure or the owners manual .

    All heat pumps will need to be installed on a level platform or slab. You cut the pipe after the filter and any chlorinator, then connect the pool plumbing in and out of the heat pump. Heat pumps require a 30-60 amp breaker, depending on their BTU output size.

    Your heat pump installation may require bringing more power to the equipment pad, or if youre lucky, you have enough room left to add the required breaker size to the panel. To be safe, use a qualified electrician to perform the electrical hook-up on your new heat pump.

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    Selecting A Heat Pump Pool Heater

    Heat pump pool heaters cost more than gas pool heaters, but they typically have much lower annual operating costs because of their higher efficiencies. With proper maintenance, heat pump pool heaters typically last longer than gas pool heaters. Therefore, you’ll save more money in the long run.

    When selecting a heat pump pool heater, you should consider its:

    • Size
    • Costs.

    The Surface Area Of Your Swimming Pool

    Before you settle on the size of a pool heat pump to purchase, it’s advisable to first measure and calculate the pool’s surface area to get the proper size. Most people think that the number of gallons in their swimming pool determines the heat pump size needed. However, some sites use gallons of course, it’s paramount, but let’s think about it in a roundabout way.

    That said, the surface area of your swimming pool is critically an important factor. A swimming pool with a bigger surface area creates more space to release heat, and therefore more water will heat up. So, heat pumps should be huge enough to compensate for the pool size and surface area.

    You can get the surface area by multiplying the width by the length.

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    What Size Of Pool Heater Do I Need

    If youve decided to apply a heating system to your pool, the first thing you need to do is conduct a thermal audit to effectively size up your pool. A thermal audit will determine:

    – Power required to heat your pool

    – Appropriate equipment for your pool

    – Operating costs

    – Temperature increase times

    Both the shape and size of your pool or spa affect the time it takes to heat up and the amount of energy required to heat it. However, there are a number of other factors that need to be considered.

    What Else Do You Need To Know About A Heat Pump

    What size heat pump do I need?

    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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    We’re Here To Helpwe’re Here To Help

    A trained pool heating professional will use a sizing calculator toprovide a proper pool analysis for your swimming pool to determine thecorrect size heater that you’ll need. Get a free analysis by simplycompleting the form below.

    Input details about your pool, including pool size and environmentalconditions and we’ll provide you with a detailed analysis of the BTUsize required to heat your pool. We’ll include a list of features anddetails on our complete line of pool heaters and calculate costs andsavings. We’ll even share our leading brands that are backed bywatertight warranties.

    With a proper pool heat pump analysis, you will have all theinformation you need to make an informed decision on the best and mosteconomical way to heat your pool.

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    Why Proper Heat Pump Sizing Is Important Basic Guide

    Proper and accurate heat pump sizing is not easy and requires decent knowledge about the system and HVAC and the right tools. In order to answer the question how big of a heat pump do I need or what size heat pump do I need for XXX sq. ft. lets take a look at some useful tips and suggestions from the experts.

    As the climate in North America varies from one extreme to extremely hot summers in southern parts, more variables should be taken into account if you want properly to size the heat pump.

    And you have an option either to contact a professional for the free quotes and sizing estimation or consult the sizing guides found online and DIY. But you have to be careful and avoid what most of so-called expert do they make calculations based on the home floor space or the old HVAC system.

    Either one approach you choose, the proper heat pump sizing should provide an acceptable indoor comfort: temperature and humidity energy efficiency and savings.

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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.

    Min And Max Flow Rate Range

    How to Select The Best Pool Filter

    Almost there! Now that we have the minimum and maximum flow rates for your pool setup, put them together to get to your flow rate range: one of the two main specs for determining the pool pump size you need.

    So, lets say you have a 15,000 gallon inground pool. With two turnovers per day, your minimum flow rate comes to 20.8 GPM.

    Lets also say that you have a 2.3 square foot sand filter and 1.5 plumbing . You have to take the lower of those two values to make sure you dont overwork any components of your pool, so your maximum flow rate comes to 43 GPM.

    In this example, our flow rate range comes out to 20.8-43 GPM.

    Lets figure out the last main spec you need for your pool pump: total dynamic head.

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    What Size Heat Pump Do I Need For My Above Ground 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

    Keeping this in consideration, what size pump do I need for my above ground pool?

    For round above ground pools up to 24 ft. use a 1 HP pump. For round above ground pools over 24 ft. use a 1.5 HP pump.

    Likewise, how much is a heat pump for a pool? Heat pumps are priced according to BTUs and COP. Prices start at $2,000 – $3,000 and go as high as $4,000 – $5,000. Heat pump operating costs vary by geographic location, desired pool temperature, and whether or not a pool cover is used.

    Simply so, how many BTUs does it take to heat a 30000 gallon pool?

    For pools of up to 20,000 gallons, small heat pumps like the Hayward 95K BTU output are suitable. Pools up to 30,000 gallons should look at the AquaCal 120K BTU or higher, and 40,000 gallon inground pools should look at models like the Pentair 140K BTU.

    Can a pool pump be too big?

    Too large of a pump can cause poor filter performance and even damage it, if the filter is not also oversized accordingly. Another possible consequence is pump cavitation in which bubbles form in the water inside the pump and then burst with great force, resulting in damage to the impeller and other internal parts.

    How Much Pump Do I Need

    If your pool volume is 15,000 gallons, then one turnover would be equal to 15,000 gallons. This turnover is required every 12 hours, or twice a day. Pumps, on the other hand, use a slightly different description of “gallons per minute” or GPM. Think of this a little like the miles per gallon quoted as gas mileage on your car. Our goal is to meet or exceed our minimum required turnover and to use the least amount of energy doing it.

    Here is the problem: most pools are designed to sell, not to operate. It has become very popular to “sell on horsepower” or how powerful a swimming pool water pump is, not how efficiently it operates. Many pool builders routinely sell against their competition by quoting a “bigger” pump as a “free upgrade.” As a result, the vast majority of pools have pumps that are severely oversized. Water pumps of 1, 1.5, and 2 horsepower are very common — and for the average size pool, very oversized.

    Also Check: How Much Liquid Chlorine For 20000 Gallon Pool

    What Size Heat Pump Do You Need

    Heat pumps are extremely efficient pool heaters. The units themselves do not actually generate heat, but use electricity to distribute it ingeniously. A heat pump can extract heat from cooler air than the water it is going to warm up. This means the operating costs of a heat pump are significantly less than a gas heater. This also means that a heat pump needs to be chosen effectively for its size and energy output to match the pool that needs warming. In this article we will discuss some basic calculations you can do at home to determine what size heat pump is right for you.

    How Many Btus To Heat A Pool


    Size 4 BTU per gallon or 1 BTU per litre of water to be heated under normal summer conditions with an average ambient air temperature of 70°F over a 24 hour period.

    Size 5 BTU per gallon or 1.3 to 1.5 BTU per litre of water. heats under normal spring and fall conditions with an average ambient air temperature of 60°F over a 24 hour period.

    Sized at 6 BTU per gallon or 1.5 BTU per litre of water. heats under normal spring and fall conditions where the ambient air temperature averages less than 60°F over a 24-hour period.

    Sunrain swimming pool heat pump is a smart and reliable solution to heat the pool and spa. With most of the energy absorbed from the air, Sunrain pool heat pumps can heat the pool and spa all year round with much less cost. Running at low cost and without CO2 discharging, people can enjoy swimming or spa at pleasant water temperatures all over the year.

    If you want to get more information about how to size a pool heat pump, welcome to contact us today or request a quote.

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    The Climate Of Your Place

    The climate of where you live is another important factor to be considered. If you live in a comparably warm area, your pump doesnt need to work too hard. In this case, if you have an average-sized pool, you simply need a small to standard-sized heat pump.

    On the other hand, if you are in a colder area, your pump needs to work hard for your pool. Most heat pumps out there will serve you around the 50-degree mark.

    Also, there are heat pumps that are designed to work at a lower temperature . So, these kinds of heat pumps can help you in colder climates.

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