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Asking again

Ok I just got a gas boiler to replace my oil boiler. It’s a Westinghouse wbrc140 It has a internal circulator on the supply side. I added a few more baseboard radiators in the second floor considering it never had heat. Alas here is my issue, it’s a mono flow system,to start. The heat does flow to the second floor, it just seems to take a lot longer then I anticipated. Question is with the circulator on the supply side, may I, can I, should I, or not add a second circulator on the return side to help pump faster. I should add it’s all one zone up and down work on one t stat.


  • Brewbeer
    Brewbeer Member Posts: 616
    Did it heat faster with the oil boiler ?
    Hydronics inspired homeowner with self-designed high efficiency low temperature baseboard system and professionally installed mod-con boiler with indirect DHW. My system design thread: http://forum.heatinghelp.com/discussion/154385
    System Photo: https://us.v-cdn.net/5021738/uploads/FileUpload/79/451e1f19a1e5b345e0951fbe1ff6ca.jpg
  • kcopp
    kcopp Member Posts: 4,392
    How did you pipe it? it should be piped primary/ secondary.
  • Jamie Hall
    Jamie Hall Member Posts: 22,916
    Two pumps in series is a very poor idea. If you need more flow capacity, a bigger pump is a much better idea.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • lchmb
    lchmb Member Posts: 2,997
    I find the 008 works real good on monoflo. more gpm...how about a picture of the boiler to see how its piped? The other question, is it using out door reset and did the curve get set or is it factory?
  • MikeJ
    MikeJ Member Posts: 103
    Look at all the Geo pump packs that have two pumps in series.
    JUGHNE Member Posts: 11,021
    But there is not a boiler between them, would that be different?
  • DZoro
    DZoro Member Posts: 1,048
    How long is " A lot longer". The second floor is the furthest away from the boiler, sometimes patience is ok.
  • Jamie Hall
    Jamie Hall Member Posts: 22,916
    I should be more precise. Two pumps in series is OK, provided they are properly matched. Likewise two pumps in parallel. However, if a system -- such as it might be a radiant piping set of loops -- needs a pump, the simplest and most reliable solution is one pump with the needed head and flow capabilities.

    Without getting into a dissertation here, any pump installation must concern itself with the net absolute pressure at the inlet to the pump. If you have two pumps, one at the inlet to a pipe system and one at the outlet, there is a real risk that the one at the outlet may not have that pressure required, unless (in a heating system) that is the point of no pressure change.

    There are too many possible configurations to give a general answer. However, the fundamental question is -- why bother? With the wide range of pumps available, surely one could find a single pump which matched the system.

    The only time I have used two pumps in series -- and I have -- was in a situation where I simply could not find a single pump with adequate head. It was a slightly unusual situation; I needed to pump -- as I recall -- about 200 gpm up an elevation difference of about 3500 feet... that installation got an intermediate 15 stage turbine at the 1700 foot level installed in a surge tank.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • Paul48
    Paul48 Member Posts: 4,469
    I'll repeat what was asked......how did you pipe the added baseboards?
  • Memoose
    Memoose Member Posts: 2
    Using mono flow t’s I spliced the upstairs in the supply side. The current circulator pump is factory installed from Westinghouse.
  • Steamhead
    Steamhead Member Posts: 16,723
    That won't work. Too much pressure drop in the new zone.

    Repipe it so the new zone has its own circulator and add a flow-check to each zone.

    Maybe it's time to call a pro. Where are you located?
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service