Heatmaster G series 3 way mixing valve

Rugar Posted By Rugar, Oct 4, 2017 at 9:12 AM

  1. Rugar

    Rugar
    Member 2.
    NULL
    

    Oct 12, 2008
    128
    1
    Loc:
    East central KS
    Is it necessary to have a mixing valve on a heatmaster g series to limit cold return water. It does have a circulator dedicated to mixing internal water. Wouldn't that accomplish the same thing.
     
  2. hondaracer2oo4

    hondaracer2oo4
    Feeling the Heat 2.
    NULL
    

    Jan 18, 2012
    302
    40
    Loc:
    Canterbury NH
    Heatmaster has gone the direction of adding the mixing pump onto the boiler instead of requiring return protection via a three way valve. I think that the mixing pump helps if the boiler gets some cold water return but I think there is no substitute for a return protection valve. With all that being said the g series is an outdoor boiler that typically operates 24/7. Since that is the case the boiler won't be heating a store of water and then going cold waiting until the next time it is fired. Operating this way causes you to have cold water return to the boiler until your storage gets up above 140. The g series running 24/7 shouldn't drop below 160 unless the fire goes out. With proper flow to the heat load you shouldn't see more than a 20 degree delta t which means you should be above 140 all the time and the mixing pump helps to mix it if it does.
     
  3. Rugar

    Rugar
    Member 2.
    NULL
    

    Oct 12, 2008
    128
    1
    Loc:
    East central KS
    Thanks for that reply. That's what I was thinking but wanted to make sure. Now I need to figure out how to add a line into boiler room for heat and double as an over run. Also it needs to be separate via flat plate or sidearm for antifreeze. I probably should start a new thread for that
     
  4. hondaracer2oo4

    hondaracer2oo4
    Feeling the Heat 2.
    NULL
    

    Jan 18, 2012
    302
    40
    Loc:
    Canterbury NH
    I take it that you are planning to run glycol in the g100? Why? The boiler room in the house or boiler room outside??? This is an open boiler and really shouldn't climb in temp very much in ththe case of a power outage.
     
  5. Rugar

    Rugar
    Member 2.
    NULL
    

    Oct 12, 2008
    128
    1
    Loc:
    East central KS
    Not planning to have glycol in boiler itself or house just a loop for supplemental heat in garage. I did start another thread about install questions. Im really missing the simplicity of having a pressurized wood boiler like my old eko 25. Plumbing seemed simpler to me.
     
  6. hondaracer2oo4

    hondaracer2oo4
    Feeling the Heat 2.
    NULL
    

    Jan 18, 2012
    302
    40
    Loc:
    Canterbury NH
    Is the g100 in the garage that is going to be heated? You could just put the garage loop on a timer so that it circulates the water every hour for a minute so it keeps it from freezing. If you had a pressurized boiler and you wanted a loop like the garage with antifreeze than you would still have to separate the systems with a flat plate.
     
  7. maple1

    maple1
    Minister of Fire 2.
    NULL
    

    Sep 15, 2011
    7,490
    1,307
    Loc:
    Nova Scotia
    Wouldn't this dedicated mixing circ also have the effect of making supply temps lower? Which may or may not be a concern...
     
  8. Rugar

    Rugar
    Member 2.
    NULL
    

    Oct 12, 2008
    128
    1
    Loc:
    East central KS
    Was thinking about placing the garage loop on the return side. I need every degree to keep the house hot, however I don't need the capacity of the furnace in the house. I'm expecting return temps within 15 degrees of supply. I have an old inefficient house and baseboards need it hot to keep up.
     
  9. Rugar

    Rugar
    Member 2.
    NULL
    

    Oct 12, 2008
    128
    1
    Loc:
    East central KS
    For the heat emitter was thinking of an old cast iron radiator, old truck radiator with fan, or a Mr heater coil with fan. The garage is 22x23 ft and uninsulated at the moment.
     
  10. hondaracer2oo4

    hondaracer2oo4
    Feeling the Heat 2.
    NULL
    

    Jan 18, 2012
    302
    40
    Loc:
    Canterbury NH
    Your money would be well spent to at the very least air seal the home. That is the biggest losses of btus.
     
  11. Rugar

    Rugar
    Member 2.
    NULL
    

    Oct 12, 2008
    128
    1
    Loc:
    East central KS
    Certainly so but my biggest priority now is getting this furnace installed. Don't want to rely on my indoor gas boiler that's 40+ years old more than I have to. The house has had some pink board laid tight over the old siding and then new vinyl siding overlaid on that around 15 years ago. Tyvec wasn't that popular yet. My foundation cracks and windows are the biggest problem. First I'll get boiler in then try a few windows. Sometimes blow straw on foundation when gets cold.
     

Share This Page