In my new 8 by 14 lean-to GH, I have two open windows into the house with a small window fan circulating air continually. This allows me to not have to vent and waste hot air to the outside as well as help moderate temps. I added one of the small oil filled electric radiators listed above, trying to keep the temps above 55 at night. With the radiator, continual fan and 15 hour a day lights, I was worried how crazy the electric bills would be - could end up with some expensive tomatos. But after the the expense of building the GH and loving growing the plants, I would not have changed a thing. I did turn the thermastat down in my home to help compensate for the added GH. I just got the first electic bill since adding the heater. I used 3KWhours per day less this month than the same month last year. Maybe I should add more lights. :) Carol Here is a link that might be useful: pictures of lean-to greenhouse

My bathroom is 11 x 7. I've used the heater twice now. I turned it on just before getting in the shower and by the time I was done...oh..15 minutes...no gasping....the room was nice and warm. The heater has two settings...1500 watts which you feel immediately and a power saver mode of 1000 watts. From the brochure: "120F Exit Air Temperature. The exit air temperature is approximately 120F, warm enough to heat an entire room." The only thing I wish it had was a timer...and that it looked a little more modern.... but heat is always a good thing.

I also installed this heater about a month ago and had all the same problems and was just about ready to get rid of it when a gas man that knew his stuff came along. It took him only a few minutes to fix. All he did was increase the gas pressure. My heater now stays on and no longer cycles. It ignites much quicker and I no longer get the gas smell. The only thing that bothers me is that several people seem to be having the same problem so the setting must not have been done properly at Hayward factory and they won't pay the gas guy so the customer gets stuck with the bill($200+ in my case) as they say "not under warranty". Thanks a lot Hayward. I know that I won't forget this experience next time I need a new piece of pool equipment.

I guessed when it was about 400 cfm. Standing at the range, you should be able to sense when it begins to move a lot of air. The switch I purchased, has a 1/4" compression fitting for copper tubing. The tubing is inserted into the duct. The adjustment is a screw ( I believe it's simply weighted ). I set it up about 6 years ago, and it works well. Not to get complicated........... Since I had the kitchen gutted, the walls were easily acessible: By the range, I added a 2 gang electricl box: For a MUA axial fan speed control, and a switch for the MUA duct heaters. We have found you don't always want that much air blasting into the kitchen. Duct heaters, we're in Minnesota. I found a double throw / off in the middle levitown decorator switch. This way we can get no heat, low, or high heat.