Rinnai V65IN 5.3 GPM Indoor Low NOx Tankless Natural Gas Water Heater

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Price: $685.18    

Product Feature

• Max BTU's 150,000
• Max Energy Factor 0.82
• Indoor Installations
• Meets California and Texas NOx Emissions Standards
• Lightweight and Compact

Product Description

Rinnai's V65I interior-mount tankless water heater efficiently delivers up to 5.3-Gallon per minute (GPM) of hot water, making it perfect for your one- or two-bathroom home. This easy-to-install, ultra-compact unit lets you enjoy all the benefits of Rinnai tankless water heating. You'll experience clean, reliable hot water at a consistent pre-set temperature, while saving energy and precious floor space in your home.

Rinnai V65IN 5.3 GPM Indoor Low NOx Tankless Natural Gas Water Heater Review

install was fairly painless as far as the unit goes. I chose this as the time to learn to solder plumbing so that stretched things out. I move my water lines and got a bigger gas line to replace the one going to the old hot water heater.
I ran it for 2 days with no vent on it. I just kept the back door open so no chance of carbon monoxide poison. I wouldn't recommend doing this but I'm OUTRAGEOUS!!
Unit worked fine. washed a few loads of clothes. dishwasher and a couple showers. No problems. I wish it would get 10 degrees hotter. 120 is not quite good enough. I guess there's an Addon to make it go to 140 which would be nice. sucks you have to pay more for it.
!!!!!!! IMPORTANT !!!!!!
It doesn't come with a vent kit And the instructions all refer to their vent setup.
Here's the important thing!! Its a direct vent unit. Not knowing what that meant I connected a 5" vent to the unit. It slides right in past the rubber gasket. Perfect fit I think.
Turn on the hot water and 20 or 30 seconds later BOOOOM!!! it blows up. Well that was scarey. Panic and look for a fire. shut off the gas. nothing really looks wrong so I try it again. Booom. hmm.
I called roto rooter on a sunday before memorial day and a guy comes out and tells me its back-drafting because my gas line is to small.
I change to a bigger supply line.
Boom.... Glad he didn't charge me for the service call...

OK so now im going to call my hvac buddy to come out. But in the middle of the night I have an epiphany. The 5inch vent pipe coming out of the top of the unit has a smaller 3 inch pipe inside.

Its the 3inch inside pipe that is a vent. The outside is actually the fresh air return.
See new houses are well sealed and if the unit didn't have its own fresh air return it would create a vacuum in the house and not work.

Sooo. I ran a 3" pie from just the exhaust of the tank and left the fresh air open to pull from inside the house. We are in an old condo that is far from sealed so no issues with a vacuum.
muahhahaha,. working like a champ now.

So what was happening was with a 5" pipe around the whole thing it was trying to intake and exhaust through the same pipe. It would blow out the flame because there's not enough oxygen in the exhaust gas. Then the gas would build up and the ignitor would kick in and blow it all up.

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