Tankless water heater not to blame for bad pipe venting.
I’ve been heading downstairs in the morning after E leaves for work to take care of our cat, Voices, who is in kitty prison for marking around the house. I’d noticed a bit of an exhaust smell a few times, and logged it in the wtf area of my brain under Tankless Water Heater (of course, Carbon Monoxide is odorless). Yesterday morning was particularly bad, and we ran the dishwasher in the evening and had to open the basement windows so the whole-house-fan could dissipate the gasses (none of our CO sensors beeped, but whatever). After clearing the water filtration drop-valve (the only diy warranty maintenance on the tankless system), I googled for venting and found the solution. A plumber on you-tube shows exactly how bad installations lead to exhaust blowing back into the house; and how to fix it with Aluminum tape- assuming that everything else is done right. Ours is not done right, but AL tape triage (after cutting a bit more of the drywall ceiling away to reach around the tubing) is the fix it gets for now.
This galvanized tube needed Aluminum heat tape. It should be stainless steel tube with sealed fittings, and the top run should slope downward by a degree or so to the outside to keep condensation from running back into the vent tubing and possibly ruining the tankless system. It is at a straight 90 degree bend snugged up against the floor above, and there was some condensation damage to the tubing.
The system had huge gaps where the pipes sleeved into one another (which is beyond stupid construction work from the original installation), and water staining and pinholes from condensation rolling back into the house. I could feel (and smell) the exhaust blowing down into the room when running hot water. It must always have had some exhaust blowing back in, and the whole house fan probably backdrafts the system. Maybe when the heater fan turns off and the system is cycling, then the whole house fan pulls all the latent gasses into the house. something like that anyway.
In June I replaced the big brass fitting on the R- it is the water pressure gauge, and had begun to drip, then spray a fine mist. This gauge should be placed after the piping for outside water, but no, we regulate the pressure for the yard. So that needs resolved. Turns out we also filter the water for the yard as well, which is the blue unit. It had no filter in it, so I picked one up and installed it. This unit is supposed to be placed in line with the tankless water heater as a pre-filter just for the heater.
Still not right plumbing wise, but at least not trying to kill us any more.
Broad Canyon Fire. Acrylic. 24″x48″
some sense of the perspective; near = fire/sunlit crazy smoke you are about to pass under, far is miles and miles of smoke heading to distant mountains.
Redo of the last post with an image 5x denser; the sun is now red and the vaseline view is clarified.
This is ten days of painting, but who’s counting…