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This is a clear indication of what is called: "Hard Water"-- meaning that you have too many minerals in your drinking water!-- This problem is aggravated when you heat the water (as in your Hot Water Heate3r!)-- Heating causes the mineral (normally dissolved in the cold water)- to precipitate OUT when heated-- and thus they end up setting in your piping AFTER the heater. Solution: YOu may have to install a water softener, to reduce the 'hardness' of your water. Another aid, is lowering the water temperature of the hot water heater-- Can you do that, and still enjoy the bathing or showering with that water temperature? The lower the water temperature it is heated to, the fewer minerals will settle out in the piping after the heater. You must notice this problem in your Tea Kettles-- and your Coffee Maker?- Tell us more-- and we'll help you further.
All parts for Rinnai Heaters and Tankless Water Heaters must be purchased from Rinnai authorized dealers. To find one closest to you go to http://www.rinnai.us/ and click on find a dealer tab in the top red banner..
chances are that you have a bad faucet that is drawing water from a cold water tap. You will need to have a helper turn on the hot water in that bathroom while you feel the pipes at the water heater and see if they are heating up. If they feel like there is no flow, the water is coming from somewhere and you will need to turn the shut-offs of at various sinks to target the problem faucet. If you find which cold water line is acting up, install a back-flow check valve so the water goes only one way, toward the faucet.
your temp control is bad and you will have to have a tech to service the unit, contact rinnai and they will give you info on a quilified repair person,, not just any one should be allowed to work on it,, depending on the age it may still be under warranty,, they come with 5 year parts 1 year labor 12 years on heat exchanger this is on all rinnai units
sounds like the water line is frozen before it gets to heater. You can take a blow dryer and try to thaw the line.You should be able to hook up a hose on the hot side of water heater. turn valve off so it wont flow into house.You can turn on hot water valve on in kitchen but you will have to thaw cold and hot line. Make sure you know where water shut off is to the house just in case a line breaks.
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.
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.