Swimming Pool Ideas – Question and Answer
I need help sizing a natural gas pool heater for a fiberglass pool

I need help sizing a natural gas pool heater for a fiberglass pool

07 September 2020

I need help sizing a natural gas pool heater for a fiberglass pool. The dimensions are 16’ x 40’. It has a tanning ledge that is approximately 16’ x 10’ and the shallow (3’6”) to deep (7’) end measures approximately 16’ x 30’. I tried calculating the gallon capacity by the usual formula online (L x W x Avg. Depth x 7.5) and that was off by about 4,000 gallons for some reason because the pool specs say it holds 15,400 gallons. Using the formula, I came up with around 19,500 gallons taking the tanning ledge (8-10” deep) into account. Anyway, that might not matter for the sake of my question. How many BTUs do I need for a natural gas heater? I’m only looking to take the chill out of the water in the beginning and end of season and I’d like to keep just above the freezing point during winter as I don’t plan on closing it. I live in the South; temps are usually a high in mid 40’s and low in upper 20’s during the coldest month or two in winter. Pool will have a saltwater system.

den: Surface area x 300 will get youma minimum input BTU that should achieve 3/4 degree temp rise every hour the heater is one for most of the year. Otherwise you need to look up the sizing charts from the heater manufacturer that you are coming sidering for a better sizing.

stev: What brand and model is your pool?

cry: it’s a Latham Corinthian 16. It’s going in at the end of September.

den: Cry you’re going to want a 200,000 BTU or larger gas heater for that pool.

stev: Here is a chart that tells how many BTU of natural gas given the size and length of your gas pipe. I wouldn’t bother purchasing a heater that is rated a lot higher in BTU than your pipe can supply.

Here is a chart that tells how many BTU of natural gas given the size and length of your gas pipe.

Here is a chart that tells how many BTU of natural gas given the size and length of your gas pipe.

Heater sizing

Heater sizing

eri: I agree with Dan 200,000 btu or larger!

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