Thanks, Ryan. I am inclined to place one at sleeping-to-thermostat level, near the beds. After all, aren't we primarily concerned with the risk while we're sleeping?
An earlier experience, with a first-generation model, had nuisance tripping from the "bloom" of gas released when the wall-mounted heater kicked on. I believe that the unit was located too close to the heater, and the tendency of the "bloom" to rise before dispersing contributed to the problem. (The heater has a direct outside air source, as well as a direct vent).
