Quote:
Originally Posted by Fuzz
If you have a well sealed new house that is a big risk. It will suck air from anywhere for combustion, including the hw heater exhaust, and furnace exhaust. If you turn on a kitchen fan and bathroom fan(several hundred cubic feet per minute of air-think about that for a sec...), you have all these things evacuating air from your house, and the only holes in being the exhaust ones. That is how you get carbon monixide in your house.
I hope you have a functioning CO detector, and if you insist on carrying on, at least open a window near the HW heater that isn't near water pipes, so they won't freeze too....
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This shouldn't be a problem in a newer house as they are required to have a combustion air inlet in the furnace room for conventional appliances. Hi efficient have their own inlets and do not draw from the surrounding air. The inlet and exhaust are sealed from the ambient air.
Older houses never had the inlet and this was a problem but anything built or serviced in the last ~20 years should have some combustion air supply.