I have a recently installed Rinnai RU801 Tankless Water Heater. The WH was installed with the concentric vent option. The WH is mounted on an interior wall, and the vent goes directly to a 90 degree elbow, then slopes UP to the exterior wall over about a 10 foot distance, then 90s up, second 90 to horizontal, exits the house, then 90s up in a snorkel for about 18" (for snow), then 90's horizontal with the dual pipe outlet/inlet.
The house is still under construction, and the WH has not yet been fired up yet.
I've had some intermittent water drips that appeared on the bottom of the water heater, but I was not able to determine the source. Yesterday, there was a lot of water on the ground, and I took off the cover and traced the water up to the intake fan. It appears that water is entering the intake air pipe and running down to the tankless water heater (I thought it was wrong to slope DOWN to the water heater, but the instructions indicated that this is how to do it).
I've read the WH manual, and while it addresses condensate from the exhaust, it says nothing about the intake.
I can try to better protect the intake from rain, but is there anything I can do on the intake pipe? Can I drill a hole in the exhaust section of the pipe and run it to a drain?
The house is still under construction, and the WH has not yet been fired up yet.
I've had some intermittent water drips that appeared on the bottom of the water heater, but I was not able to determine the source. Yesterday, there was a lot of water on the ground, and I took off the cover and traced the water up to the intake fan. It appears that water is entering the intake air pipe and running down to the tankless water heater (I thought it was wrong to slope DOWN to the water heater, but the instructions indicated that this is how to do it).
I've read the WH manual, and while it addresses condensate from the exhaust, it says nothing about the intake.
I can try to better protect the intake from rain, but is there anything I can do on the intake pipe? Can I drill a hole in the exhaust section of the pipe and run it to a drain?