thermal expansion tank/water heater

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    • 4 Sep 2002 at 10:37 pm #275763
      Avatar photohenrywilson

        What is the purpose of adding a thermal expansion tank to a gas 50 gallon water heater? I have to replace the water heater and the plumbing company is recommending that I add the expansion tank. I’ve never had one and I’m leary, their charge is $200 just for that piece. Any insight is appreciated. BC

      • 5 Sep 2002 at 12:23 am #292842
        Avatar photoNickHydro
        Participant

          You hav rto stop watre from goin back to the street with valvs so wen yuo heet it grows an can pop out the releef. Thapanshun tank gives watre room to growe.

        • 5 Sep 2002 at 2:07 am #292843
          Avatar photoracefanone
          Participant

            There is a thermal expansion ball valve out that takes the place of the tank.Dont waste your money on a tank .This valve has a relief valve on the side.You need a drain in which to drain the discharge from it.Ask your plumber to check the valve out.

          • 7 Sep 2002 at 3:09 am #292844
            Avatar photorobertgf
            Participant

              why does any thermo expansion device need to be installed unless the t/p valve is discharging?

            • 7 Sep 2002 at 3:42 pm #292845
              Avatar photoNickHydro
              Participant

                Bout the same reeson yuo ned seetbelts ina car.

              • 10 Sep 2002 at 12:35 am #292846
                Avatar photorobertgf
                Participant

                  need a little more ‘splanin on that one , if the water system in the house is able to accept the expansion of the w/h (usually past the water meter & into the street[ provided there is no pressure regulator])why do you need the expansion tank? the t/p is the saftey release.

                • 10 Sep 2002 at 12:53 am #292847
                  Avatar photoNickHydro
                  Participant

                    Code sez thet yuo havto putin a bakflo so the street dont tak up thepanshun Thet maks the fawsets leek wen the preshur geto 100 ponds the releef only dumps watr et 125 ponds Like yuo dont us the arebags in yor car evrie tim yuo driv.

                  • 12 Sep 2002 at 12:21 am #292848
                    Avatar photorobertgf
                    Participant

                      nick as usual you bring an ounce of clarity to an otherwise confusing world, thanks

                      » This message has been edited by robertgf on 12 September 2002

                    • 15 Sep 2002 at 6:14 pm #292849
                      Avatar photoTheLocalPlumber
                      Participant

                        The reason why the new code requires an expansion tank on each and every new installation is for the protection of the public, of course.
                        For if no new expansion tank is installed for that heater and one day a homeowner installs a pressure regulator, the expansion tank will not be there. Not every home needs an expansion tank with there current plumbing system, the code is there to overprotect and to take care of alot of “what ifs” just in case someone alters the system in the future, the homeowner will be protected.
                        So pay up and protect yourself.
                        Good Luck,
                        Bill
                        The Local Plumber
                        Tustin, California http://www.TheLocalPlumber.com

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