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youngrichyoung t1_jdjds5s wrote

Some tankless water heaters have language in the warranty fine print that voids or shortens the warranty if they're used in recirculating systems. They're not designed for that kind of constant duty.

You should consider point of use heaters (as other users have suggested).

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GeekX2 OP t1_jdje626 wrote

I'm thinking more along the lines of a thermostatically controlled pump, perhaps in conjunction with a timer so that it only circulates at certain times of day. These are available.

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