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I have a room in my apartment that can sometimes get around 40°F (4°C), and that's where my new tankless water heater is stored. Should I take any special precautions to keep my pipes from freezing or to avoid any other weird problems with my water heater? I live in the US Midwest in a second-floor apartment.

  • This strongly borders on HomeImprovement.SE topics. – Erik Sep 9 '20 at 6:48
  • What's the make/model of the heater? They might have recommendations of ambient temperature. I also wouldn't be surprised if it has an "emergency" thermostat to run a little heat if the unit is close to freezing. – LShaver Sep 9 '20 at 14:05
  • Thanks, good question! I never bothered to look. I have this: rheem.com/product/… I can't yet tell whether it has an emergency thermostat setting like you describe. – capet Sep 9 '20 at 15:59
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    How would water freeze at "plus 4 degrees Celsius"? – sharptooth Sep 17 '20 at 10:33
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    Yes, that's possible but if that water freezes then all adjacent pipes are also at risk. – sharptooth Sep 17 '20 at 15:22

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