Response to I have a small (5400 gal) in ground pool, indoors so no heat from the sun. I believe this size heater will do the trick but every website says it is for above ground pools. Does that matter, or do they say that because of the typical sizes of above ground vs in ground? Heater will be outside, so no need for a stack and I only use it spring through fall so I am not concerned with having extra BTUs for winter heat.

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