I have an inground fiberglass 12,000 gallon pool. Even though the "recommended" btu size for my pool is in the 200k range, my pool guy who is a very close friend steered me toward the 336k and I couldn't be happier. Pool heats up really quick! Also, with his recommendation I ran an 1 1/2" line from my gas meter so I'm sure that helps too. In the early spring when the pool was at its coldest it would heat the water about 4 degrees an hour. Now it's June and warmer it basically maintains 88 degrees all the time. Another reason I chose this brand is my guy said with his experience it's very easy getting parts for this unit compared to other brands.
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