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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