Read my my post that started this thread and you will see that I agree with you and did not ask about their saftey but am worried that this is going to be a big problem in years to come if the sensors fail. You will also see that I don't sell, install, or recommend them.
Originally posted by irishmist
When it comes to these type appliances I try to look at it logically, although that's not always easy to do. Two words jump out: "gas" and "ventless" These two terms are not mutually exclusive of one another. When shopping for a fireplace for my elderly parents the sales rep promoted the "ventless" system very strongly. My concern was the use of an "oxygen depletion switch." What that meant was just before you passed out, it would shut off the fireplace! Now I may be oversimplifying, but like an earlier comment, why would you want to utilize your living space as part of the flue? The fact that the majority of areas prohibit the installation and use of these should account for something. Trane: the fact that you have to make an inquiry about the safety and use of these should be enough for you to avoid furnishing and installing them. Think of all the occurances of CO poisoning with "acceptable" installations and equipment. Why would you want to take a chance with something that is "borderline?" Oh yeah, when I asked the sales person what happens if the oxygen depletion switch fails, they did not have an answer, but I could quickly picture the worse case scenario. Good practice: NEVER, NEVER, NEVER, install a system, equipment, or leave a system or piece of equipment operating in someone's home that you wouldn't put in your own child's NURSERY!