sizng a pool heater

grindog

iam sizing a new boiler for heating a 25,000 gallon pool and piping a radiant zone in a 2000 square foot basement. What is the btu take off for the swimming pool and can i use a flat plate heat exchanger for the pool or would i be better off using a indirect hot water heater to gain more volume. thank you

Kal Row

it takes 1btu to raise 1lb of water, 1degree per hr...

there are 8.33 lbs in a gal, so the pool has 208,250lbs

a 250 unit should do fine, but dont even think of starting that process untill you have straight sunny days - you will loose heat faster than you are putting it in and never get it to 84

i recomend the sta-rite heater

Kal Row

also about the flat plate..

it would have to be huge - for the flow rates involved - and need a filter - dont do it!!!

put the radiant zone on a seperate small hot water heater,

Al Letellier

heating pools

I believe that too many pool heaters are way oversized. Remember that you only have to heat it up once and then you just maintain temp. A good solar blanket will keep in the heat. We have an application where the pool is 20x40 inground with 10' deep end, in Maine, and we are using a 3 section 100MBH boiler with a small tank type heat exchanger. We have a second tank type pool heater for a spa, and the pool heats up from 40 to 80 in about a day and a half, and uses only 250 gallons or so for the entire season. Oversizing will only heat it up faster and then be really inefficient and will short cycle all season.


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Al Letellier

heating pools

I believe that too many pool heaters are way oversized. Remember that you only have to heat it up once and then you just maintain temp. A good solar blanket will keep in the heat. We have an application where the pool is 20x40 inground with 10' deep end, in Maine, and we are using a 3 section 100MBH boiler with a small tank type heat exchanger. We have a second tank type pool heater for a spa, and the pool heats up from 40 to 80 in about a day and a half, and uses only 250 gallons or so for the entire season. Oversizing will only heat it up faster and then be really inefficient and will short cycle all season.
Check out SuperStor. I believe they give a formula for their heaters.

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