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  1. CharlieFromMass

    Stiebel Eltron solar hot water - losing pressure

    Thanks for your reply - this is an antifreeze closed loop with a pressure tank and relief valve. There could certainly be some mineral deposits in the relief valves or some related issue with them if the require any kind of maintenance. The temp sensors sometimes get flaky and I have replaced...
  2. CharlieFromMass

    Stiebel Eltron solar hot water - losing pressure

    I have a Stiebel Eltron solar hot water system approx 15 years old for which I've been doing most maintenance the past 7 or so years. The system slowly loses pressure - used to be over a period of a year or longer but now more like 3 months. When it does it eventually blows off steam on the...
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