The home I recently bought has a hot water heater that is different
from any I've ever seen before. There is a fan blower on the top of
it, so that every time the hot water heater kicks on, so does the
blower. Seems odd to me. Hot air rises. But I do notice that the
exhaust is out the side of the house about rather than through the
roof. Is that why? Thanks.
I presume it's a gas fired high efficiency water heater.
As you pointed out, hot air rises, but since the exhaust "pipe" can run
sideways for quite a distance in some installations a fan is needed to
push the combustion products outside.
Called a Power Vent heater (or you might have a Direct Vent).
Instead of having a chimney, the draft blower sends the
combustion gases out the side of the house.
Not needing a chimney, they can be located more
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