Click here to Find a Contractor in your area.
Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit

Tekmar demand signal with TRV's

Tylor Member Posts: 1
I was just wondering what guys are doing to signal a demand through a Tekmar or similar boiler control with a system using TRV's or where end switch wires cannot practically be run to the control.

We've thought of using a flow switch but have had trouble finding one with a low enough minimum flow to close the switch. This is for small multi-family units consisting of 4-6 zones.

Since we run conventional oil fired boilers we have to maintain much higher temps than necessary in the shoulder seasons. Our thoughts are with a proper demand signal we could run it on a cold start. Systems are set up primary-secondary with the system loop using a delta-P Wilo Stratus Eco pump so flow rates can get quite low.


  • SWEI
    SWEI Member Posts: 7,356
    TRVs modulate

    So flows really can get down there.

    Given the requirements, I'd probably install an ORC-controlled mixing valve on the distribution loop and let the WIlo run all the time (it will go to sleep in the event the TRVs all close off.) Then add a buffer tank and use WWSD on the burner.
This discussion has been closed.


It looks like you're new here. If you want to get involved, click one of these buttons!