Keeping DHW on, but Radiators off - NAVIEN

Discussion in 'Tankless Water Heater Forum' started by theMezz, May 20, 2019.

  1. theMezz

    theMezz New Member

    Joined:
    Feb 28, 2011
    Location:
    Central NY
    I have a Navien all in one,,,

    I am starting in a bathroom and want to physically remove one water heat radiator for 2 weeks.

    How do I shut down the unit, but LEAVE the Domestic hot Water ON

    Is it ok, to just turn the heating water isolation valves to off, disconnect the radiator - disconnect the house thermostat - but leave the Navien ON so we have Domestic Hot Water?

    Thanks!
     
  2. DIYorBust

    DIYorBust Member

    Joined:
    Mar 5, 2019
    Location:
    Long Island, New York
    Yes that should be fine if the plumbing is done the normal way. I'd pull the thermostat so you don't dead head your pump. Probably want to drain down the the system to below the radiator before you pull it.
     
    theMezz likes this.
  3. Sponsor

    Sponsor Paid Advertisement

     
    theMezz likes this.
  4. Dana

    Dana In the trades

    Joined:
    Jan 14, 2009
    Location:
    01609
    Your plan to disconnect the thermostat and isolate the loop with valves should work. Don't drain the system unless you absolutely have to. I believe the static pressure on the heating side of Navien combi boilers needs to be at least 12 psi for it to fire up at all. When you pull the radiator either cap off valve isolate the missing radiator section and check that the pressurize the heating system side is still running 12 psi (30 max, but 15 psi is enough for most residential systems) and add water if necessary.
     
    theMezz likes this.
  5. DIYorBust

    DIYorBust Member

    Joined:
    Mar 5, 2019
    Location:
    Long Island, New York
    Wouldn't the house water pressure/prv maintain pressure on the heating side?
     
    theMezz likes this.
  6. theMezz

    theMezz New Member

    Joined:
    Feb 28, 2011
    Location:
    Central NY
    It seems to be
     
Similar Threads: Keeping Radiators
Forum Title Date
Tankless Water Heater Forum Cast iron radiators and Takagi TH 2 Apr 9, 2012
Tankless Water Heater Forum mod con tankless combo NG boiler sizing to exisiting cast iron radiators Feb 20, 2012
Tankless Water Heater Forum Tankless or Boiler for Radiators and DHW? Sep 21, 2009

Share This Page