I’m in the middle of a small renovation of my family room. I’d like to add some baseboard on the cold side of the room. Lots of questions below.
Background: It appears that the previous owner removed a section of baseboard that was piped through the slab before adding a fireplace (which I since removed). They never added a new section to compensate. 2016 I got a Lockinvar KHN085 installed by a local company. During planning I did my own heat loss calculation and noted that my family room was under-radiated by about 5 feet. Not a surprise as it has been a bit chilly in this room for the past 10 years. Fast-forward to today – I have an opportunity to add some baseboard to the cold side of the room as part of my reno. Room is on a slab, front and back walls are exterior and one wall is shared with the insulated garage.
What makes this a bit more difficult is that my family room is on a slab. I am also replacing the patio door with something a bit taller which will take up most of the stud space under the header not leaving any space on this wall to route pipe. The tile is not being redone, so trenching a pipe isn't an option.
System: Lochinvar KHN 085, 2 zones piped in series (1st Floor, 2nd Floor), slant fin baseboards, Taco 007 circulator used for the zones. I have the ODR set to run almost non-stop all winter. Very conformable in the house other than the area I am trying to deal with.
My proposed solution: My thought was to add the baseboard to zone 1 between the powder room (next to my family room) and the rest of the family room. See poorly drawn picture below (not to scale in the slightest). I would remove the elbow exiting the powder room and pipe straight out into the stud bay in the family room. I’d pipe up the stud into the ceiling, follow the joist bay to the other side, then back down the stud to the baseboard location. I’d pipe the return the same way, connecting back into the existing pipe headed to the rest of the family room.
With the additional 5 feet of baseboard, I’d be just under the 67’ threshold for the zone. As mentioned previously, I’d also be matching my heat loss per my calculations. My math was correct for the rest of the house.
Lots of questions.
1. I’d be adding ~60 feet of piping and a few more elbows. I assume this won’t be a problem for the circulator pump?
2. Any issues with going in the ceiling with this piping run? This configuration would lead some water being trapped in the baseboard if I would ever need to drain the loop. Should I be installing a drain valve next to the baseboard to drain if needed?
3. I’d like to use Pex (would use PAP). Do the copper to Pex adaptors present any flow issues that I should be worried about?
Looking for input on my plan. Any input on better methods or pointing out something I missed would be greatly appreciated.