thermal expansion tank/water heater

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  • This topic has 8 replies, 5 voices, and was last updated 19 years ago by TheLocalPlumber.
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    • #275763
      henrywilson

      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

    • #292842
      NickHydro
      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.

    • #292843
      racefanone
      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.

    • #292844
      robertgf
      Participant

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

    • #292845
      NickHydro
      Participant

      Bout the same reeson yuo ned seetbelts ina car.

    • #292846
      robertgf
      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.

    • #292847
      NickHydro
      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.

    • #292848
      robertgf
      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

    • #292849
      TheLocalPlumber
      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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