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our LP gas hot water heater has an exhaust fan on it that has to come on first, if the fan isn't on then gas will not turn on and the flame will not light, so we have that fan on a simple Christmas tee light timer that comes on at 6am and turns off at 8am, leaving us with hot water all day until 2pm when it comes on again for an hour this cut our LP use in half, it would be less but we use LP for cooking as well.
I wonder if you could do something simaler with your boiler, and the timer has an over ride switch so you can turn it on if you wan really hot water at 2am or something crazy.
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