No votes.
But, manufacturers do not warrant products against bad design. If it works for the warranty period, then as far as they are concerned their warranty obligations are satisfied.
That's how they all think. End of story.
Also, EVERY heater manufacturer will assume that premature failure of wetted metal parts was caused by the pool owner's failure to maintain the pool's chemistry. My own personal experience suggests that that viewpoint is not always correct, but it usually is.
Best wishes.
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