Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

question with piping with gb142

It is suggested to use the domestic hot water tapings on the GB142 manifold and the domestic hot feature we offer. If the DHW priority is used on the GB142, the boiler will fire to high limit (194 degrees F), de-energize the primary loop pump and ignore the delta T modulation. When the domestic is treated like a zone of heat (priority zone on a relay board) the GB142 does not reconize it as a call for domestic hot water and will modulate the burner based on the delta T, just like a heat zone. This could cause the domestic to take longer to recover. The use of a "kick space" type of heater should not be an issue. Please contact me if there are any questions.


  • MARK_95
    MARK_95 Member Posts: 1
    piping question with gb142

    i just had all new piping installed with my existing boiler
    can the indirect use the existing piping or does it need to piped thru the manifold sent with the boiler. also i have toe kicks on one zone and cast iron radiators in remander of house. any problem with the toe kicks using the 142 with modulation
  • Eric_33
    Eric_33 Member Posts: 3

    Hey Mark,

    You should pipe the domestic tank to the provided taps on the provided manifold. Reason being is that the provided boiler pump shuts off on a call for domestic. You must also upsize your domestic pump to overcome the high resistance in the boiler.

    If the boiler came with the AM10 reset control you would want to program it for the highest temp heat emitter.(The toad space heater) The dial on the boiler should be set for AUT

This discussion has been closed.