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Piping distribution to new rads
The attached diagram shows the planned location for new hot water rads I’d like to install in my 1900 SF house. Thirteen rads and two low temp baseboard units on the main floor. The boiler would be in the basement directly beneath Rad 7. Each grid block equals two feet.
Most people here seem to favor home runs, but in my case, this seems like an awful lot of tubing. Also, rads 9-13 and both baseboard units are above the unheated garage, which is shown in cross-hatching. Any tubing to these units would need to criss-cross the 750 SF garage ceiling, which is already covered by 10 light fixtures, a bunch of surface conduit, the garage door opener, and a steel I-beam the runs across the garage ceiling and drops down about 12 inches. I was hoping to minimize the tubing here, and much of the heat loss, by going with a two pipe system, at least above the garage.
But the layout of the house also isn’t good for reverse return, unless I skipped the interior rads and upsized the perimeter rads, though this would leave the kitchen and hallway with no rads at all.
That leaves direct return, which had been my plan, using three feeders and TRVs on all rads. But after playing with the head loss and flows, it seems like it’s going to be a challenge to balance. Seems like the more distant rads could still be relatively starved during really cold weather.
Was wondering how people here would approach this issue, given the diagram and the limitations of the house.
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