On Thu, 10 Nov 1994, martha rubin wrote:

> With these installed vented catalytic propane heaters,
> do you still have to leave the window open a bit?  If so,
> don't you lose a lot of heat that way?
> 

No window opening is technically necessary...but I still leave one open a 
crack if the pop top is down. Radiant heat doesn't require the air to all 
be heated for a nice warm feeling.