southern burner heaters

[awalker1106]

Hi --- I am getting ready to purchase a heating system for a new greenhouse after being out of orchids for 25 yrs. I am thinking about purchasing a Southern Burner C-1 non-vented heater ... Does anyone have experience with this model? Are there problems with flower development and gas combustion products as a result of non-venting?

Thanks

[HDCochran]

I use another brand of non-vented heater and cannot identify any impact on orchids or citrus.