>We have two propane heaters--no electricity, no natural gas lines.
>Glow-Warm 18,000 BTU, Comfort Glow 15,000 BTU. Can be vented or
>unvented. Ours are unvented since they're so small and low-power.
Doesn't unvented fill the house with noxious fumes? I have read that even
cooking with gas has been known to cause problems.
It hasn't been a problem. You could use air-to-air heat exchangers to
change the air frequently, but our house isn't officially
superinsulated. These are blue flame heaters that are 99.9% efficient.
The byproduct is primarily water vapor. As long as the tank is outside
and doesn't leak inside, it's fine. The greenhouse leaks enough fresh
air into the house most of the winter through the cat door and roof vents.
Our heaters are very small and aren't used more than a few hours a day
[haven't used them since Tuesday], only on low and sometimes medium heat
[500/600 BTU each]. Most houses around the same size would require 10
times more BTUs than ours [max for unvented is 40,000 BTU]. There's a
low-oxygen monitor that turns the heater off automatically. The supplier
adds a noxious odor to the odorless propane so customers can smell a
leak and shut down the heaters. We turn off the pilot and valve when
we're away; if the propane leaks when you're away, your house could
explode, but you'd notice a leak when you're at home by the scent. For a
typical American house, you'd need vented propane or natural gas heat,
not unvented.
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