Bosch 1600H tankless water heater (NG)

Discussion in 'Tankless Water Heater Forum' started by soonergirl99, Jan 29, 2009.

  1. soonergirl99

    soonergirl99 New Member

    Messages:
    1
    Location:
    Dallas-Fort Worth area
    We installed a Bosch 1600H (natural gas) yesterday. When we first tried to start it we would get a spark but it would not light (the green light would not come on). After about 10-15 minutes of trying different faucets we now no longer get a spark.

    We know it is getting gas. We reduced the gas flow into the unit from 3/4" to 1/2" because of existing pipes from the previous, very old, standard hot water tank. Could this be part of the problem? If not, what else could be wrong?

    Thanks!
  2. gregsauls

    gregsauls Homeowner

    Messages:
    56
    Location:
    Texas

    This unit uses water flow to generate a spark. Low flow through the unit could be an issue and I would suspect the low flow of gas as another possible issue. Page 3 of the manual states 3/4" gas line as a requirement. Page 11 states "The minimum diameter required for any appliance connector used is ¾ NPT."

    One other note from page 19...
    Confirm that there is an adequate flow rate. With
    the temperature adjustment knob on the unit
    positioned all the way clockwise, a 1/2 gallon per
    minute (GPM) flow rate is required for heater
    activation. Fully open a hot water faucet and fill a
    quart container. If the container fills in 30 seconds or
    less, the flow rate (1/2 GPM) is sufficient to activate
    the water heater.
    NOTE: When the dial is turned all the way
    counterclockwise, a flow rate of 1.1 GPM is required
    for heater activation.
    Last edited: Jan 29, 2009
  3. Gary Swart

    Gary Swart In the Trades

    Messages:
    7,341
    Location:
    Yakima WA
    Aside from the questionable worth of any tankless water heater, you never should mess with the manufacturers installation instructions and especially with gas. It goes without saying that you had no permit and have no intention of having it inspected, so what you have is anyone's guess. If you're lucky it won't go boom!
  4. Ladiesman271

    Ladiesman271 Homeowner

    Messages:
    221


    You most likely still have some air left in the gas line. You have to bleed that air out of the heater before the gas will get to the burners.
  5. nhmaster

    nhmaster Master Plumber

    Messages:
    3,189
    Location:
    S. Maine
    Helmet secured. Awaiting orders Captain. :rolleyes:
  6. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
    Whatcha think NH Master...
    It sounds to me like the Dilithium Crystals are shakin too hard and it's gonna be nothing but tribble...
    Bosch Repair Video
  7. nhmaster

    nhmaster Master Plumber

    Messages:
    3,189
    Location:
    S. Maine
    Hey Red, nice Pex post on ****. Note my incredible restraint on the subject.:D
  8. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
    You must have your helmet strapped down tight tonite.
    Either that or the big sticks are all covered in snow...
  9. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
    Maybe we should put together a kit we send out to these DIYer gas installations...

    Bunk beds, a square, purple cloth, five dollar bill and three quarters, black shirts and sweat pants, brand new black-and-white Nike athletic shoes, and armband patches reading "DIYer Gas Installation Team" for each family member.
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