Quote:
Originally Posted by SimpleManLance
the water heater is a high efficient one with PVC venting that is 5 years old.
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I would look at that water heater again. It is probably just power vented, not high efficiency. If so, it will only be 50% efficient.
A lot of people equate power venting with efficiency and it is not so. I just moved into our new (old) house and it has a power vented, mid efficiency boiler.