What do you look for in a water heater?

[BigM]

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In hot water...

Ran into a new problem last night. The instant hot water heater powering our Autovap decided it had better things to do with its time and electrickery than help me recover solvent Current diagnosis is that the flow sensor doesn’t like hot water! I believe we’ve got a replacement sensor coming, but I suspect that is just going to kick the can two weeks down the road rather than solve the problem. We’re looking for one rated for the temp now. Question: why has nobody else raised their hand on…