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Hydronic Retrofit

Dan Foley
Dan Foley Member Posts: 1,258
Brian and Dragon’s latest creation. This is a hydronic retrofit in McLean VA. The 1960’s two-story Home was heated by electric baseboard.

We are installing Runtal baseboard sized to heat thechomecatc140* SWT.

We installed radiant floor heat in the kitchen and we will install Runtal towel warmers in the baths.

An NTI trinity running on outdoor reset drives the system.


  • Dan Foley
    Dan Foley Member Posts: 1,258
    DHW is provided by two 80 gal electric water heaters. This was chosen over an indirect as the owner is installing 32 pv solar panels on the roof.
    EBEBRATT-Ed Member Posts: 15,345
    Nice job!!
    Dan Foley
  • Steamhead
    Steamhead Member Posts: 16,734

    Nice job!!

    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Dan Foley
  • DanHolohan
    DanHolohan Member, Moderator, Administrator Posts: 16,491
    Retired and loving it.
    Dan Foley
  • Solid_Fuel_Man
    Solid_Fuel_Man Member Posts: 2,646
    edited August 2019
    Nice work!

    How do you like the NTI? I put one in at a large radiant slab shop. Same SS HX that W-M uses. I liked the ability for BMS interface with a 0-10volt input, but found the touch screen to be difficult to navigate.

    I also found it curious that NTI suggests pumping into the HX, with expansion on the return, yet W-M suggests pumping out of the HX with the expansion on the supply. Low head fire tube HX...
    Serving Northern Maine HVAC & Controls. I burn wood, it smells good!
  • EzzyT
    EzzyT Member Posts: 1,290
    Beautiful job as always @Dan Foley
    Dan Foley
  • Dan Foley
    Dan Foley Member Posts: 1,258
    @ Solid_Fuel_Man

    We have been using NTI boilers for about 4 years now. Easily 100+ installed. They have proven to be solid and reliable.

    I like the touch screen control. I sent my techs through the factory training to learn how to properly program. The more you use it, the easier it gets.
  • John Ruhnke
    John Ruhnke Member Posts: 882
    Great job and it looks like a work of art.
    I am the walking Deadman
    Hydronics Designer
    Hydronics is the most comfortable and energy efficient HVAC system.
    Dan Foley
  • TAG
    TAG Member Posts: 755
    Nice -- I used some Runtal baseboard and towel warmers when I redid my place in Chestnut Hill. Two of the warmers used thermostats and one used a Danfoss head ... like the Buderus panel radiators I used. In my case it was all PEX and manifolds -- so the warmers need a dedicated loop. I wish Runtal made a bypass fitting as they have on the panel radiators .. it would make them easier to install. Having the Danfoss head is easy and quick
  • Erin Holohan Haskell
    Erin Holohan Haskell Member, Moderator, Administrator Posts: 2,263
    They're going to be very comfortable this winter. Nice work, Team Foley Mechanical!
    Dan Foleynjtommy
  • Robert_25
    Robert_25 Member Posts: 527
    Dan Foley said:

    DHW is provided by two 80 gal electric water heaters. This was chosen over an indirect as the owner is installing 32 pv solar panels on the roof.

    How large is the home? That seems like a rather large amount of DHW capacity.
  • Dan Foley
    Dan Foley Member Posts: 1,258
    The house is about 5500 sq ft. DHW is oversized to store energy from 32 PV solar panels.
  • Robert_25
    Robert_25 Member Posts: 527
    The electric bill from heating that place with electric baseboard must have been scary.
  • Ron Jr._3
    Ron Jr._3 Member Posts: 603
    Beautiful work Dan and your crew !
    Dan Foley
  • jumper
    jumper Member Posts: 2,208
    I like manifolding but did you need multiple circulators?