1. Welcome Hearth.com Guests and Visitors - Please enjoy our forums!
    Hearth.com GOLD Sponsors who help bring the site content to you:
    Hearthstone Soapstone and Cast-Iron stoves( Wood, Gas or Pellet Stoves and Inserts)

should i pressurise my OWB

Post in 'The Boiler Room - Wood Boilers and Furnaces' started by kealo, Oct 16, 2012.

  1. kealo

    kealo New Member

    Joined:
    Sep 7, 2012
    Messages:
    8
    Hey guys i have a wood doctor furnace that is open to the atmosphere. I was recently on there web site and they now only make pressurised boilers. claiming to last longer due to the ingestion of oxygen in an open system bla bla.. See link
    http://www.wooddoctorfurnace.com/index.html

    I know that pressurised system last longer and there is less to no corrosion.

    Do you think i should pressurise my system? at the top of the boiler there is a 1" open vent i was thinking of welding a coupling on and adding an air eliminator, pressure tank and relief valve. Is this all i would need to pressurise my system or am i missing something??

    thanks for your input

    Helpful Sponsor Ads!





  2. maple1

    maple1 Minister of Fire

    Joined:
    Sep 15, 2011
    Messages:
    4,234
    Loc:
    Nova Scotia
    Not if it isn't designed to run under pressure, I wouldn't think. There's quite a difference in a pressure vessel and non. Also I've heard some bad stories about those - adding any pressure at all could reveal something real bad in a big hurry.
  3. Eric Johnson

    Eric Johnson Mod Emeritus

    Joined:
    Nov 18, 2005
    Messages:
    5,725
    Loc:
    Central NYS
    You get a certain amount of pressure in an unpressurized OWB and my impression is that the water does get un-oxygenated over time, so I don't think corrosion is necessarily a given. My folks have had the same Heatmor for at least 15 years with no problems. But as maple1 notes, if it's not designed to be a pressure vessel (and yours isn't), then don't pressurize it.
  4. raybonz

    raybonz Minister of Fire

    Joined:
    Feb 5, 2008
    Messages:
    6,207
    Loc:
    Carver, MA.
    Introducing "raw" make-up water into an oil boiler is the only time corrosion is introduced this is why they last for decades. Based on this an OWB would see the same effects plus you can also heat the pressurized water to a higher temp without boiling just like a car cooling system. I wouldn't pressurize a system not designed for this purpose as you could cause hazardous conditions and risk boiler failure unless the boiler maker warrants that it OK to do this..

    Ray

Share This Page