greenhouse heaters

[BikerDoc5968]

OK, first, I have been using a non-vented NG heater for the past 3 years and have not noticed any problems with my orchids flowering or growing. This has been my personal experience. Others may have different opinions; I'm by no means an expert! If your NG heater is in GOOD WORKING ORDER, the only thing, besides heat, that it should produce from the combustion of methane is carbon dioxide and water vapor. There should be no or possibly minute amounts of carbon monoxide. These things are designed to be used inside of homes as a supplemental heat source! As for rust etc, I don't use a garden hose during the heating season because it is FROZEN! My unit is as clean and functional today as it was 3 years ago when i installed; I do remove it during the spring/summer months. I use a 3 gal hand pump sprayer which works out just great for my situation. As for the manner in which I built my GH, I placed it up on a wall so I would have greater head room since it is only 7' 4" at the center and the entrance is now level with the adjoining deck. The floor is insulated with 3" of polystyrene and the side walls with 3.5". I used a treated wood floor because of the ease of keeping things clean and water drains off and it is much easier to walk on a solid surface. In the dead of winter I can walk out there bare foot and not notice the cold! The heater is 20,000BTu and has no problem heating my 8' x 15' GH to 75 ~ 80F deg even last week when we had night time temps to 0 ~ 5F.