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I am renovating a property that I use for a bed and breakfast. I have a fairly well working 30 gallon water heater that is electric. I also have a propane tank that I use for limited heating in my shop when I need it. I also have a nice tankless propane water heater. I am thinking about installing the tankless to pre-heat the water to the electric unit to save some money. Propane is cheap and easy here. Electric is relatively expensive.

What do you think?

Judgeyoung
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    About what? Please revise to be more specific, and take the [tour] when you get a moment. We aren't a discussion forum. – isherwood Mar 04 '21 at 21:40
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    Does this answer your question? [tankless water heater before the reg hot water](https://diy.stackexchange.com/questions/116066/tankless-water-heater-before-the-reg-hot-water) – isherwood Mar 04 '21 at 21:41
  • Can you give us what one therm of propane and one kWh of electricity costs for you? – ThreePhaseEel Mar 04 '21 at 23:36
  • Why mess with the electric at all? If you've got a tankless propane water heater, just use that. – Peter Duniho Mar 04 '21 at 23:44

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