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Rinnai Propane tankless Water Heaters R85e-1

My new rinnai waterheaters (2) are controlled by a single control panel and are supposed to work together, so if there is high demand of hot water beyond the capacity of the 1st unit, the second unit will kick in and you should never run out of hot water.

For some reason, when we turn the hot water on, the flow occurs in intervals, that is, 10-15 seconds of flow, then it completely stops (nothing comes out) for about 5 seconds, then it flows again for 10-15 sec. and so on.

If I turn the heaters off at the control panel, the water flows uninterrupted.
These are Rinnai tankless waterheaters, which work with propane gas and are mounted to an exterior wall.

Any idea what may be causing the problem? Thanks.

The Model is R85e-1, (for some reason I could not enter that in the product line for this forum, so I had to pick a preselected option that does not match my product)

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Is there anywhere I can order a part for a Rinnai external water heater...was told we have to pay a technician to come out and tell us what our problem is that we already know and they will order and install the part. We just want the lousy part to do ourselves.

Posted on Apr 04, 2011

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If 2 rinnais are installed side by side they either work individually or seperatly depending on water demand. for the heaters to work correctly and in unison make sure the 2 units have a
'brain" or a circuit board installed. this will tell one or both to kick on when needed, if you do not have this installed then you will have the problem you described.

Posted on Jun 26, 2008

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Piping of these heaters in tandem is critical. Specified by Rinnai in their design manual, the cold water should be piped to both water heaters with a back-flow presenter installed before the first heater. The hot out piping should be "Tee-d" together and going to your hot water needs.

If piped as per the manual, try turning the water off to only one of the units. Turn on a hot water tap and see if the unit stays on without interruption. Then try the same on the second unit. You may find that one unit has a bad flow control, which is shutting off the flow of water.

You can get more technical help y contacting Rinnai direct at 1-800-621-9419 ext. 207.

Posted on Feb 07, 2008

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