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Need to know the surface square footage. Length X width only. Then, need to know the size and length of gas line run from the meter to the equipment pad; then the size in sq ft of filter, pump horse power, size of Plumbing. Is there a heater already in place?

Ken

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11y ago
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15y ago

How large of a heater do I need?

The model numbers indicate the BTU H400 Is 400,000 BTU

* Recommended H-Series Heaters for Swimming Pools.

Heater Model Pool Surface Area

H400 1200

H350 1050

H300 900

H250 750

H200 600

H150 450

* Determine the pool surface area by multiplying the length of the pool in feet by the width. Use the chart above to determine the heater size for your pool.

* A note about heater size: A pool heater should heat the pool, on average, one degree an hour. Once the heater is sized to the pool, stepping up one or two sizes will decrease the time to heat.

With that size pool - probably close to 18 x 36' = 640sq. ft. the recommeddation would be to use the 400 btu heater. Going to the larger heater size, if everything permits ( gas line size and run length) you will actually be using less gas to heat the pool that you would if you used the 200 or 250 heaters above. The eventual payback would be realized in you overall gas bill. So , the chart above is only for reference.

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15y ago

At a minimum you would need a 400K btu gas heater. This pool is larger than a 20 x 40' pool or 800 sq. ft. Many things dictate the size or sizing of a pool heater such as the surface area of the pool, the size of the gas line from the meter to the heater, the distance of the run from the meter to the heater, the size or capacity of the gas meter, etc. Proper sizing is a must if your heater is to run at optimum standards.

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14y ago

It takes one Btu to raise one pound of water one degree based on the density of the water. Water weighs approximately 8.345 pounds per gallon around pool temperatures. So, take the gallons of water in the pool, multiply that by 8.345 to get the weight of the water and multiply that for every degree you wish to raise the pool temperature. If you are sizing a fossil fuel heater to the task, you need to consider the efficiency of the unit. Input Btus per hour compared to output Btu's per hour vary greatly. If, for example, your heat plant is only 50% efficient, it will take twice as many input Btus than the weight of the water would require. tom

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11y ago

It depends on where the pool is located, if a blanket on the water is used at night, the months that the pool is open etc. Most of the time we like to use heat pumps over 110,000 BTU's or gas heater at 400,000 BTU's.

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3y ago

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Anonymous

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3y ago

.200000

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Q: What size btu pool heater will heat a 20000 gallon inground pool?
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