Forum Discussion

1L243's avatar
1L243
Explorer II
Nov 09, 2017

Hot Water Heater Bypass

I have had a 3 valve system and a one valve system but I have never had a two valve system. I am beginning the process of winterizing and want to bypass the hot water heater and am a little perplexed.

Cold line in on the bottom, Hot line on the top. If I shut the cold line valve it would stop water from going into the hot water tank but wouldn't it stop the water from circulating?

What are your thoughts
  • You will bypass when winterizing so you do not need to fill the HW tank with the pink stuff.
  • Is the bypass just in case there is a problem with the heater or is there another reason
  • Artum Snowbird wrote:
    The bottom is a two way valve, it either lets through straight or shuts off straight and sends it the other way like it should. The top valve is an on/off valve only. If you send water upward with the bottom valve, you want to make sure the top valve is shut off.

    Once you have them set to go up on the bottom, and not go into the HWT on the top, you will send cold water to all your taps, both hot and cold. HWT will be bypassed.

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  • rhagfo's avatar
    rhagfo
    Explorer III
    Artum Snowbird wrote:
    The bottom is a two way valve, it either lets through straight or shuts off straight and sends it the other way like it should. The top valve is an on/off valve only. If you send water upward with the bottom valve, you want to make sure the top valve is shut off.

    Once you have them set to go up on the bottom, and not go into the HWT on the top, you will send cold water to all your taps, both hot and cold. HWT will be bypassed.


    Why, it appears that the hot water outlet a check valve on it the same as used on a single valve bypass. The only plus to this setup is you could replace the check valve or
    hot water tank without shutting off water to the trailer.
  • I never thought of the cold valve being a two way valve I was thinking of and off and on. Thanks for the input.
  • newman fulltimer wrote:
    both handles point up for bypass

    What ^^^^^^^^^^^^^^^^^^^^^^ he said! (Or, the top valve may POSSIBLY point down instead.)
  • The bottom is a two way valve, it either lets through straight or shuts off straight and sends it the other way like it should. The top valve is an on/off valve only. If you send water upward with the bottom valve, you want to make sure the top valve is shut off.

    Once you have them set to go up on the bottom, and not go into the HWT on the top, you will send cold water to all your taps, both hot and cold. HWT will be bypassed.
  • Mine is like that. There is a check valve in the hot line coming out of the tank. Stops backflow into tank.

    With the valves set to bypass cold water will still circulate to everything except the water heater tank.