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Instant Electronic water heater

I have two instant water heater in the appartment, and installed already Pressure reducing valve.

Now problems are:

1.    Both heaters have similar problem that water temperature fluctuates abnormally.  Temperature is either too hot or too cold with just a slight adjustment at the water taps.
2.    The German Pool heater at the guest toilet generates abnormal noise during operation.
3.    Only one bathroom tap can be operated at a time to have hot water running.  When another tap should run (even just for running cold water) at the same time, hot water at the bathroom tap turns to cold water suddenly and temperature starts to fluctuate wildly.
Should anybody help to find out the reason? Or recommend?
Thanks a lot.

By 匿名  on 2011-05-06  答案 1   觀看次數 140

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