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I have a 7' x 7' hot tub, built as part of my pool. Walls are gunnite, same thickness as the pool. I think they were 4-6" and had rebar. The seat comes 18" from the wall which leaves a 4'x4' section in the middle. The depth in the middle is 3' and the seat is 18" high.
I like Hayward parts, mostly because it's what I have and they seem to work. Options for heater were 120kBTU/hr or 400kBTU/hr. We went with 400 since it heats the hot tub faster and the pool (27000 gallons) if needed. 400kBTU/hr will raise my pool 2 degrees per hour. My Hot tub is roughly 1000 gallons. The Heater will heat that around 50 degrees per hour.
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James
The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994)
Red-beard for President, 2020
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