by peter r
(cornwall ontario)
Rinnai R75i water heater has a small pipe sticking out of hole on the side of the exhaust vent where it attaches to the top of the heater casing. Installer capped it with a small rubber cap. It appears to be an outlet for condensation to exit the heater exhaust when operating. The cap causes water to exit at the bottom of a grommet that seals the opening where the pipe comes out of.
The water collects on the flange of the exhaust pipe and caused 2 screws to rust. Installation wanted to charge 89.00 plus tax just to show up. I decided to connect a hose to the pipe held in place with a hose clamp draining to the floor drain. No more water collecting around the mounting flange.
If you have a Rinnai tankless water heater installed make sure the installer connects a drain hose to the pipe on the side of the exhaust where the metal exhaust pipe connects to the plastic exhaust pipe. its there for a reason. Don't know why the installer didn't do it in my case.
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