2 water heater tanks parallel question

Discussion in 'Water Heater Forum, Tanks' started by jacdela123, May 9, 2014.

  1. jacdela123

    jacdela123 New Member

    Messages:
    4
    Location:
    Houston, TX
    I have 2 water heater tanks (3 years old) set up in parallel. Water heater tank2 broke down a few days ago, the plumber fixed it by replacing thermopile and control valve. Everything seems fine.

    i just noticed today when i opened the hot water faucet, water heater tank1 burner immediately started, but water heater tank2 is still in pilot light.
    i waited for many minutes and opened another hot water faucet (kitchen) but water heater tank2 is still in pilot light.. it seems water heater tank2 is acting as a back up..

    Water heater tank2 is ok coz when I increased the temperature for tank2, the burner worked. As i said it seems tank2 is acting as a back up..

    This confuses me coz the way i'm looking at the diagram below they should act together at the same time.
    I'm also looking at my water heater I don't see anything that would make me think tank2 is acting as a backup.

    I wonder if this caused tank2 to break down faster coz it's almost always on pilot light.

    Another theory I see is water pressure inlet going to tank1 is stonger so way more hot water is coming out of tank1 as opposed to tank2.


    [​IMG]
  2. dj2

    dj2 Member

    Messages:
    425
    Location:
    California
    Is the enclosed diagram an accurate representation of your set up?

    If so you have the cold/hot entering and coming out the wrong nipples.
  3. jacdela123

    jacdela123 New Member

    Messages:
    4
    Location:
    Houston, TX
    when i checked online the problem is, it is not balanced.
    i did notice outlet piping length is shorter for tank1 than in tank2.
    plumber didn't put the T outlet intersection in the middle.
    what i did is tried to balance the system by partially closing inlet valve for tank1.
    i opened hot water faucet, i checked if both tanks burner starts, there's about 2 minute gap.
    i'm fine with it. i guess that's the closest thing i can get to getting it balanced.

    do you see anything possible problem with partially closing inlet valve for tank1.

    i do know re-piping this is the proper way but for now i don't see the need to do that.
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