Question about Bosch AquaStar 2400ES-NG
After a cold snap overnight, there was no hot water in the morning. There was no flow of water from the hot side of any of the faucets. I opened the pressure relief valve to determine if water was flowing thru the heater (there was none.)
I opened up the exterior and interior covers and saw that the way the exhaust was exposed to the outside air directly. I believe that the cold air was able to make it down into the combustion chamber and cause the tubing surrounding and thru the heat exchanger to develop ice blocks. I was able to use a hair dryer to thaw the tubing out in about 20 minutes.
My questions: Is there a way to minimize or prevent the exterior air from entering the unit thru the exhaust tubing?
Is there a suitable high temp damper that would at least reduce the amount of air flow?
Is it possible to program the Secondary fan to run all the time at a low speed to provide positve pressure in the combustion chamber to force warmer interior room temp air into the exhaust duct?
Can the front and combustion covers be left off to allow interior air to keep the tubing at room temperature?
Any assistance that you can provide will be greatly appreciated.
The 2400ES in cold climates needs to be a twin piped unit. 3" SS venting with a combination air port made of pvc also 3 feet apart I believe on the same wall and at the same plane. Keep the cover on at all times and this will seal of the heater from the rest of the house and from freezing.
Posted on Jan 18, 2009
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