Question about Kitchen Ranges
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Posted on Jan 02, 2017
It sounds like the Rinnai units are working correctly but you've got some plumbing problems. Any tankless heater has a minimum water flow required to keep the burners going. If the burners were going with very little water flowing through them to carry the heat away, the heat exchanger could overheat and fail. The solution is generally to the electronic controls to set the desired temperature and then just use hot water. Once you start mixing cold water in, you actually reduce the flow of hot water and the burners turn off. If you are right near the cut off point, the burners will cycle on and off resulting in those very annoying hot-cold-hot-cold showers.
The fact that you've got those very loud noises indicates some other sort of plumbing problem. Hooking up two tankless units in series is much more complicated. In heavy draw situations, the second unit is asked to finish heating the water up to temperature when the first unit couldn't quite get it there. Now you're putting hot water into a heater and heating it more. You have a lot more issues with fluctuating temperatures and pressures within the pipes which could conceivable cause these horrible noises. Everything's got to be set up right to for things to function properly and it's easy to get something wrong.
From your description, it sounds like a better solution would have been to mount the two heaters in different places. e.g. One in the basement to serve basement and first floor faucets. The other on the second or third floor to serve those two floors. Since these units are direct vent (don't use inside air), they can even be mounted in a closed closet as long as the vent can get to the outside. With this setup you avoid the complexities of a series installation and you also have a much shorter wait time (and therefore less waste) for the fixtures on the upper floors.
Posted on Jan 22, 2009
SOURCE: No hot water
The code # 11 is a code that warns of "no ignition" and the causes of this error code are too many to list. I would suggest that a qualified tech. perform a diagnostic test and repair.
This is not a task for the "do it yourselfer"
Posted on Mar 25, 2009
you need to unplug the unit, wait for 30 seconds reset the temp to the lowest temp, then try it, if this does not work it might have done something to the circuit board, are you on a gfi out let it needs to be there is water and ele, and should be on the gfi with a reset on it,,
Posted on Jun 01, 2009
SOURCE: takes too long for hot water.
You need a recirculating line. You will have to hire a plumber to run a water line from the farthest fixture or to the fixture you are concerned about on the hot side and return it back to the water heater. this will cause hot water to constantly run throught the hot water line (via the recirculating line) and when you want to draw water from the fixture, you will already have hot water right at the line.
I know this works with standard tank water heaters, but it is a lil trickier with rinnai units(but very possible) if your plumber pleads the 5th and tries to sell you another unit call the Rinnai manufacturerand ask them how.
Posted on Jun 20, 2009
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