Question about Bosch & Tankless LP Hot Water Heater

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Bosch water heater lines clogged with pipe dope

My husband and son installed the water heater, they used pipe dope instead of pipe tape, it appears when the heater got hot it sucked the goop into the heater lines and clogged them up is there any way to clean them out, it was only used of one night. and is to expensive to just trash so please help

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  • hidnout Jan 16, 2009

    well it appears they got out the pipe dope, but the burner wont heat up now once the water is turned on. my son said last night that the pipes inside the heater were freezing up. its in a heated basement. the pilot is lit, the burner ingites but dosnt flare up when the water is on to heat it.

  • 4th gen plbg May 11, 2010

    Is the shut off valve on the cold side of the water heater a ball valve or a gate valve? If that much pipe dope as used, and I doubt it was, it at worse would cause a problem at a faucet.


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For one thing what model heater is it?? If this unit has a mechanical water valve, the water valve may be clogged also.

Posted on Jan 18, 2009

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