Years ago a friend put one of the ventless heaters in a small trailer she was renting. When she got home on a cold winter day, everything was soaked inside from the water vapor. Obviously, it wasn't a good fit for that type of installation.
Richard P. On Fri, Feb 27, 2009 at 7:00 PM, b_s-wilk <b1sun...@yahoo.es> wrote: >>> >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. > > > ************************************************************************* > ** List info, subscription management, list rules, archives, privacy ** > ** policy, calmness, a member map, and more at http://www.cguys.org/ ** > ************************************************************************* > ************************************************************************* ** List info, subscription management, list rules, archives, privacy ** ** policy, calmness, a member map, and more at http://www.cguys.org/ ** *************************************************************************
