Works as expected. Couldn't get replacement parts in stores because nobody sells hot tub water heaters anymore. And this part is cheaper than the one that comes with the burner. And combustion chamber gasket and glass and lid. All unnecessary. If you're perhaps a DIYer, you want to make things as easy as possible for yourself. Then buy a hole because then all you have to do is unscrew and re-tighten a few things and you're done. But the only negative is the thermopile.
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