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Constant circulation

Joe Plumb
Joe Plumb Member Posts: 7
Hi Dan,I had a recent conversation with a fellow member of the trade regarding constant circulation utilizing a constant but lower temperature. This method of heating came into play after I had mentioned the awful heat swing that occurs in my own home.Here's the situation. I,ve got old style recessed cast iron radiators on the first floor zone and they always overshoot the setpoint on the t-stat; at least by three degrees on really cold days. Yes, I have checked the heat anticipator setting. He mentioned installing a two stage t-stat and a mixing valve. Hot water is produced by the boiler and circulated into an aquabooster requiring the boiler to maintain temperature. Given this, what would you suggest as an efficient setup incorperating constant circulation? (controls, mixing valve, etc.)


  • Dan Peel
    Dan Peel Member Posts: 431
    a different Dan

    What we've been doing is piping the boiler as a secondary and "feeding" into the constant circulation of the CI loop. Your alternate load of the DHW tank doesn't need to have any effect on the space heating flows or temperatures. This strategy also allows for the use of WWSD and full reset of the radiator primary. Enjoy....Dan

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  • and the other dan

    dan h. will be out of town till next week, he told me to tell you.
  • Al_3
    Al_3 Member Posts: 79
    A small band aid

    Maybe you could try wirsbo's New digital t-stat, has a -1 degree dif.
  • Mike T., Swampeast MO
    Mike T., Swampeast MO Member Posts: 6,928

    (Thermostatic radiator valves) May be difficult with recessed convectors (like requiring in-line valves below the rads) but with constant circulation and TRVs, space temperature fluctuation is near nil.
  • kevin
    kevin Member Posts: 420
    what would ..

    you use (make/model) to control the boiler and water temp in a constant circ. system? If it were your house?
  • Mark J Strawcutter
    Mark J Strawcutter Member Posts: 625
    a couple of options

    tekmar 256 or 260, Honeywell AQ475A

This discussion has been closed.