Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.
If our community has helped you, please consider making a contribution to support this website. Thanks!

Adding to a monoflow system

Options
Halbert
Halbert Member Posts: 26
in THE MAIN WALL

House in suburban Philadelphia. Hot water baseboards, NG fuel. Main floor is a single zone. Loop is set up with monoflow tees.

There are two rooms that seem to need additional baseboards to get them decent. Especially like now, where the outside temperature is flirting with 0F.

The question is, will it be problem to add more baseboards? In one room (bathroom) there is a space on an outside wall were a 4 ft section could be added, and it will directly above the loop pipe in the basement. In the other room, the only place to add another baseboard unit will be on an inside wall, and the piping will have to either loop out from the main pipe somehow, or involve a cross connection across the loop.

I will absolutely have my HVAC contractor do the connections. Suggestions please on questions to ask, pitfalls to look out for, etc.

Note, I had a bunch of new windows (double glazed, inert gas) installed last March. It's better, but not enough.

Comments

  • 2x_Tom
    2x_Tom Member Posts: 43

    You can certainly add more tees and radiation to a monoflow loop. It's done all the time. You can also change existing baseboard to high output. Is the existing baseboard getting hot?

  • Halbert
    Halbert Member Posts: 26

    Oh, yes, it's getting hot. There just doesn't appear to be enough. Aquastat set at 190. Bathroom is about 60 sq ft, on the house corner, with a single 6 ft strip. Living room is big—about 15X30, with an old, unused fireplace that has the flue blocked with insulation. Total 16 ft of baseboard. Living room has one outside wall, with multiple windows and the main door.

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 19,947

    You need 2 monoflow tees 1 for the bathroom and 1 for the living room. They should be size for the same size as the others on your main probably 1" or 1 1/4". The monoflow tee goes on each baseboard return. Use a regular tee for the baseboard supply. The branch pipe size should be 1/2" copper tubing for all tees.

    Make sure to put a baseboard tee on the baseboard return connection for an air vent.

    The monoflow tee and the supply tee need to be spaced apart at a minimum the length of the baseboard they supply but more is better. If you can keep the tees 18" away from any elbows or tees in the main.

    If the branch piping is more than 10' from the main you may wan't to use 3/4" tubing. The branch pipes should pitch up toward the baseboard (you don't need much but do not pitch down or elbow down)

Categories