Question about Rinnai Digital Remote Water Heater Control Mcc-45-4us

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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

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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.

Posted on Mar 24, 2011

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Posted on Jan 02, 2017

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1 Answer

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...


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.

Mar 21, 2011 | Water Heaters

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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

Jan 17, 2011 | Rinnai Water Heaters

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Ignition problem: I have a gas hot water system: RINNAI CORPORATION; MODEL:REU-2008W-A the panel display temperature as 40C, when open the tap, the temperature display dropped to 12C, and no...


This is an error code 12, not 12 degrees. You have a short on your low voltage side by the sounds of it.. First disconnect the controllers inside the heater. Turn of the power first, 2 screws top and bottom to take the frnot panel off. Follow the low voltage wires (not the power point ones) to the PCB on the ride side and disconnect them both. Panel back on, power on and try the heater again. If this fixes it you have a short circuit in the controller or the wires leading to it. If not the most likely short circuit is on the thermal fuse which loops around the heat exchanger. This will need an expert, Perth has plenty north and south of the river. Give Rinnai a ring first, they have some good staff in Perth who might help.

Dec 02, 2010 | Rinnai Water Heaters

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I need a service manual for a Rinnai Infinity 26 continuous flow hotwater system - REU-VR2626WG-AK Can you help me? Linda


I left Rinnai only about a year ago at a levle of State Service Manager. I had been asking for service manual for for many, many months. Basically as far as I am aware there is not a service manual for the WG. If you google Rinnai Infinity 26 manual you can get a PDF from the Rinnai NZ sales site but his dates baack to 2003. Unfortunately there are major changes to some of the components but it might be better than nothing. Just don't use part numbers, and you might find bits to check that now have voltage and resistance differences. Send a message to Rinnai complaining, I encouraged people to do so even when I worked for them!

Aug 26, 2010 | Water Heaters

2 Answers

Hi there, I have a rinnai 20 ,the water heats up


Usually this type of fault is down to poor water flow. Basically you are asking the unit to work at a level below it's minimum output. Easy thing to try is to check any filters or water flow limiters in your tapware. Usually these are in the nozzle of the tap. I often take these out. The inifinty reduces water flow anyway and there is no reason to have water limiters. Try turning on two taps at once. If this stops the fault then you definately need to increase your water flow. Make sure the mains water is turned on full. Aslo you can check the cold water filter on the infinity. It's just above the cold water isolation tap (middle pipe as you look at it), turn that off first, the filter is a round plastic nut, unscreww it and clean the filter. Reconnect, turn you mains water back on.
There are other faults but this is by far the most common.

Aug 14, 2010 | Rinnai Digital Remote Water Heater Control...

1 Answer

Need help


I would use the instant unit for a secondary unit to a large conventional heater, 40 gal min, gas or electric. They are both about the same now, but when the power goes out, you might not have the pump running, but you will have hot water! And whether it is a secondary or a primary water source, you will have a hot supply feeding it just in case. We have 2 people in the house, and a 30 gallon unit, and it is not big enough. The 40 gallon tank worked great. Hope this helps.

May 04, 2010 | Bosch & Tankless LP Hot Water Heater

1 Answer

Our rinnai infinity 24 is not heating the hot water at all its sound like its going through all the right motions but no hot water the tec said could be the solinoid but they no longer stock new ones. any...


I WOULD SUGGEST YOU BUY A NEW UPDATED ONE AS TEN YEARS OF LIFE FOR THE ONE YOU HAVE WAS GREAT , SO YOU SHOULD LOOK FOR A PLUMMERS SUPPLY STORE AND CHECK FOR AN UPDATED ONE , AND IT IS EASY TO INSTALL AS YOU SHOULD GET INSTRUCTIONS AND MAKE SURE THE POWER IS OFF BEFORE YOU START, GOOD LUCK.

Nov 11, 2009 | Rinnai Digital Remote Water Heater Control...

2 Answers

In your experience is better to put a Rinnai Tankless Water heater in the attic, the garage or outside? Please help we are building a house and running behind on plumbing


depends on where you live. Also depends on your venting options. I believe the Rinnai is vented with a stainless steel kit....very limited and expensive.

I would suggest looking into a unit called Navien....it is 98% efficient and qualifies for the 30% tax credit....plus it is vented with PVC and can run 70-100 feet depending on the unit, making venting much cheaper and easier to do.

Oct 24, 2009 | Rinnai Digital Remote Water Heater Control...

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