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You do have to keep up on the cleaning of the exchanger. I've gotten away with every 2 years on my heater but some we need to do every year. Just part of the equipment I guess.


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That was one negative I read about Rannai. They use relatively thin walls on their HE and it's not Stainless Steel.... which then means it's probably a more compact HE but is probably more sensitive to scaling.

Good looking job. We have had terrible luck with these units however. Split HEs and rinnai does not support them very well. When HE goes there is typically collateral damage since all controls are below HE.

Well that makes sense then!

He didn't care about any savings. He wanted the room to build an entertainment rack / system, as there was no where else outside it went.


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So how much money are you really saving having to run heat tape all the time? Just curious, but it doesn't seem like the pay back would be there. A vacation home I can understand the logic.

And I still wouldn't try it here. We have at least a week of - double digits. Actually had my truck thermometer read -35 one morning.

The electrical meter was existing when the owner bought the home. He wanted the water heater to match that finish, so that is what was done. We cut the existing stucco and some rock then finished back around the unit.


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My neck hurts from trying to look at those pics. Looks like they finished the stone face wall and dryvit around the new unit and electrical meter.

It does get cold in Colorado from time to time. This has been installed for 2 years going on its 3rd winter season coming up and haven't had any issues. We check the heat tape and the auto valves on the pm to verify operation. The heater will also fire for a few seconds so the exchanger won't crack, a feature from Rinnai

Originally Posted by mayguy

Isn't still cold in the winter in CO for this to be outside??

Not according to the manufactures but I used to live in CO and it got down to -18*F one night when I was oncall.

Isn't still cold in the winter in CO for this to be outside??

The pipes are in the lower box and insulated and heat taped. If the power goes out there is an auto valve in the basement that opens and drains the lines.

Originally Posted by OldSchoolMech

Cool I have never seen an outside tankless water heater. Don't think it could take a canadian winter EH!
Nice install

Sure, just need a little thicker insulation and plenty fo heat trace.

You can do exterior in Colorado. I thought it still got pretty cold there. Seems a little risky if the power goes out for a period of time.

Wheres the pipe insulation?

Never seen a horizontal left tankless before!

It was directed to the ground. That picture was a mid shot.

relief valve should be piped 6 inches from ground or at least face it down so when it goes off it doesnt hit someone in the face

Cool I have never seen an outside tankless water heater. Don't think it could take a canadian winter EH!
Nice install

Tankless H2O

Exterior Tankless water heater install. Replaced 2-50 Gallon tanks with on tankless.