My 2 cents, since pool was built 10 months ago we've had a Pentair Minimax HTR 400 NT TSI NH.
It's been a pain, 1/2 the time whenever went to use it to heat spa this winter it didn't work with E04 error message on LED screen. Builder fixed it 3 times so far and has 3 year extended warranty . . . still . . . .
PS: We never heat pool as live in south Texas so get enough heat and frankly it's way to big a heater for a spa.
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