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I have a rinnai 24 infinity model reu-242w-a. It ison the roof of a 3 storey townhouse we are moving into.Tthere are no remotes. It was working fine on demand until a plumber drained the system on the ground floor a few days ago to do some bathroom mods .. Now it only produces luke warm water at best. Any ideas?

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Ask the plumber who did the mods. to come a check that he hasn't crossed a hot/cold pipe. Really sounds like he has, this would cause hot water to mix with cold. Is the water hotter further away from where he did his work? This would be a clue. Easy way to check is to turn off the water to the hot water system, should be a valve on the middle pipe going in to the heater. This should turn off all water to all your hot taps. If you still have water at any hot tap or shower then the pipes have been crossed.

Posted on Mar 30, 2011

  • mklooknum Apr 02, 2011

    Thank you i same a problem
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Wanting to install a Rinnai Infinity HD200i, looking fot details on flue installation. How high does it need to pertrude through roof. Cheers Bob


Good cheer, Bob.
GENERALLY speaking: on a direct vent water heater, meaning a passive air flow pipe up through roof, the vent stack should be higher than roof peak and should not have tree branches or any kind of living-space air intake (window, chimney) or air conditioner within 10 feet, or other exhaust nearby. Local codes affect exact location and height. For example areas with high wind might be different than other areas of country and require certain height, since the wind can stop combustion exhaust from exiting house, and topple over vent stacks, and push odorless poison CO gas into home where it will kill the parakeet and set off CO alarm.

This being said. Each model tankless can have different venting requirement.
I would contact Rinnai, and read installation manual, read the required maintenance, and make sure you have qualified service technician available in area to save posting on fixya next year.
Bosch has a pdf for testing proper draft on certain models: http://waterheatertimer.org/pdf/Bosch_Checking_the_draft.pdf

Upvote the help.
And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

May 09, 2011 | Rinnai Water Heaters

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Im looking for the best option to get a Rinnai unit that would supply water at 30c or just below. i was going to buy the REU 55RT but looking at the manual i dont know how low the temp can get


Most tankless are preset to 120 degrees F.
30 degrees C is 86 degrees F.

If you want adjustable product, then tankless is not best choice.
Tankless are high tech gadgets with multiple interrelated parts controlled by sensors feeding information to control board. Everything internal and external has to be working correctly for tankless to work at all.
Most tankless brands do not suggest self-install, or self-adjustment, or any adjustment for reason given above.
You would be better off buying typical tank-type gas or electric and then thermostat adjustment is simple.
http://waterheatertimer.org/How-to-adjust-water-heater-temperature.html
http://waterheatertimer.org/pro-n-con.html
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Add a comment for more free help.
Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

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1 Answer

I have a Rinnai REU 55ft, which ignites but won't stay lit. We've cleaned the filters, fiddled with the dials and ensured that the batteries and propane are good. Any thoughts?


Hello,
In these water heaters there is a part called a "flame sensor", if you can read the wiring diagram/schematic spend some time trying to find where it is at; it will be located directly in the burner compartment. It senses that the gas is lit and there is flame, if it does not then it will shut the gas off almost within 3 seconds.
Solution- Turn off the power to the unit completely and take the flame sensor out and clean it with a 000 steel wool pad. These flame sensors develop carbon from the gas and then stop reading properly. You can test the measurement if you had an electrical meter (uA is how it would be listed on your meter- most basic meters have this function).
Let me know if this works, if not I have another solution you could try (I'm pretty sure this will do the trick though) James

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Sorry to read about your problem, I hope this helps you out.

you may have a loose wire.
I tried to help you. Please help me and Rate/Vote on my response, thanks and good luck

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Just joined fixya and am a Rinnai service manager in Australia. Is this still an issue?

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Hi, our plumber has hooked up a new infinity xr-26 but the existing remotes don't work. He says it's a simple 2 wire connection but ther's no cirrcuit


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1 Answer

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