Question about Bosch & Tankless LP Hot Water Heater
We have a Rheem 21V40S-2 installed in 1999 in the attic; it is gas-charged; we bought the house 2 yrs back and can only guess that the heater has neither been serviced nor replaced in the last 10 years.
Anyhow, since the last week or so the heater has stopped heating; i.e. water coming out is not hot at all; went over to check out the heater and here is what I observed: 1) just looking at the exterior there doesn't seem to any visible difference (no overflow, no discharge etc.) 2) the air hose that is connected to the heater and exhausts through the roof had come unplugged from the joint where it exhausts out of the roof; i reconnected the hoses for now so that it is properly getting the air it needs; did not make any difference - the water is still not hot; 3) I left a couple taps on for a few minutes and during this time tried to see if there was some activity inside the heater (like sound of water being heated etc..); it is still very silent..
can one of you help out on what is going on? I am hoping this doesn't mean a big bill.. all help is appreciated
All brands and models have a flow switch which protects the heat exchanger from overheating, a very common problem is calcium build up in the heat exchanger which reduces flow and causes the flow switch to shut off the burner. Can be fixed by descaling the heat exchanger. We have a kit available at heaterup.com its safe and easy to use.
Posted on Jul 14, 2009
Pilot light needs re-lit? aDVISE IF THAT IS NOT THE PROBLEM
Posted on Jul 11, 2009
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Posted on Jan 02, 2017
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