"Edwin Pawlowski" wrote in message
news:IK_3j.105$VJ.16@trndny05...

"Phisherman" wrote in message
My thoughts are that anything that is
burning needs to be vented.

Correct, but the question is how much venting. Many of the new propane
heaters are 99+% efficient so there is not much fume, however, they do
consume oxygen. Since the airtightness of houses varies considerably,
that is not a big deal in most cases. Air going out a chimney = the same
amount of air infiltrating someplace

Millions of homes have gas ranges and ovens with no vents and no
problems..

I've always wondered how safe these were...

Does anyone know if they are acceptable for use in Alberta, Canada (Calgary
specifically)?