crazypipes
New Member
JUST THE QUESTION: I am needing to run two propane tankless water heaters, but common venting is only allowed by the manufacturer if the units are connected electronically, set to the same temperature, and on the same distribution system. For reasons below, I would like different set temperatures and isolated distribution systems, but I am trying to minimize venting needs. Can these two units share the intake, but have individual exhausts? This would mean 3 vent pipes instead of 4, and I would really like to eliminate that 4th pipe. I cannot find anything about common venting only the intake, but intuitively it seems like it would be ok since these units also allow for room-air intake.
SKIP THIS, OPTIONAL DETAILS IF YA GOTTA KNOW: This is part of a whole-house down to the studs restoration of an 1880 farmhouse, all walls are currently open and some framing is still in progress. The water supply is from a dug well a 1/4 mile uphill that gravity feeds a cistern in the basement, in the winter the water is barely above freezing. To get to 120 degrees F, we are talking up to an 80 degree temperature rise. My hot water desires include:
SKIP THIS, OPTIONAL DETAILS IF YA GOTTA KNOW: This is part of a whole-house down to the studs restoration of an 1880 farmhouse, all walls are currently open and some framing is still in progress. The water supply is from a dug well a 1/4 mile uphill that gravity feeds a cistern in the basement, in the winter the water is barely above freezing. To get to 120 degrees F, we are talking up to an 80 degree temperature rise. My hot water desires include:
- 2 concurrent showers or 1 shower with concurrent washing machine run
- 800 sqft of hydronic radiant heat (first floor only, as a luxury not primary heat to home. House has adequate forced hot air heat)