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HW Loop off steam boiler.

weil-Mclain peg 40 steamjust installed  a weil-McLain peg 40 steam boiler.

I ran a hot water loop, and im having a problem with circulation thru the boiler.

I pulled the supply off the return right off the boiler and dumping it back in where the boiler drain tapping is. everything is below the water line ( pump, flow control valves ). With this boiler should I be using the return tappings on each side of the boiler to get proper circulation ?


  • TimcoTimco Member Posts: 2,813
    What size

    are your tie in points and what size pipe to and from the WH? What do you mean by flow problem? Not making hot water? What size pump? Any chance of pics? Any check valves on the loop?

    Working on steam and hot-water systems isn't rocket's actually much harder.
  • plumber888plumber888 Member Posts: 5
    Hot water loop off a steam boiler

    Connections are 3/4 inch. So is all the baseboard and flow control valves.

    Im using a bronze taco pump. There is about 20 feet of baseboard.

          I had this system running fine on the old boiler.

    Now that i installed the new Weil-McLain PEG 40 Steam Boiler im not geting circulation thru the loop. 

    So I was thinking, maybe i should be supplying and returning my loop from the return tappings in the rear section of the boiler to get circulation.

        Because right now i have my supply pulling out of the return tapping and returning to the tapping for the boiler drain, which is in the middle section.

    I don't know if thats the answer until i repipe it.
  • Could be

    an air problem.  Have you power purged the piping?
    Often wrong, never in doubt.
  • Steve WhitbeckSteve Whitbeck Member Posts: 669

    does your pump have enough head lift to raise the water above the highest point of your system.

    This is not a closed loop system. The water in your loop may be flashing to steam at a low pressure point.

    Is the pump pushing into the loop?  It must be installed this way.

    Use a pump with higher head it should solve your problem.

    I have done a lot of these loops without any problems.
  • plumber888plumber888 Member Posts: 5
    Hw loop off steam boiler

    Thank you for your input.

    Yes the pump is pushing into the loop and yes i have power purged the loop.

    I'll let you know the out come.
  • plumber888plumber888 Member Posts: 5
    hw loop off steam boiler

    My total head is 6ft.
This discussion has been closed.


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