What is the safe pressure for a hot-water-heating system?
Jan 19 2015 · This is typical of residential hot-water boilers. As far as temperature is concerned my boiler will shut off if the temperature exceeds 205 F. THey do not want the water in there to boil. Of more importance though is the minimum return water temperature. With a conventional boiler you do not want the flue gases condensing in the flue so the return temperature should normally be hotter than 140 F learn More