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  1. Avgust

    Thermal Expansion Tank question

    Thank you all for your replies :)
  2. Avgust

    Thermal Expansion Tank question

    Terry, I got RINNAI RL94i tankless heater. The instructions say "If a water heater is installed in a closed water supply system, such as one having a backflow preventer in the cold water supply line [which is what I have], means shall be provided to control thermal expansion.". I guess it means...
  3. Avgust

    Thermal Expansion Tank question

    Hi all, I recently moved into a new house (built in 2016). I found a thermal expansion tank in an attic space above the garage. The valve to the tank is closed (see pic below). Shouldn't it be open? Not sure if it matters, but the house has tankless gas heater. Thanks in advance! Alex
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