Your recent columns have mentioned "vent-free heaters" and "ventless gas-burning appliances." Are these things safe -- or just carbon monoxide machines? -- H.A.K., Tulsa. Chris Kelly, a Chimney Safety ...

Over the years I've written several times about unvented or "vent-free" gas room heaters. My (negative) opinion about these appliances is based on the fact that the combustion by-products produced by ...

The aesthetic and practical aspects of vent-free gas heating appliances continue to draw consumer interest. For instance, potential buyers are looking for stylish fireplaces that do not include a ...

Radiant and Blue Flame vent-free gas room heaters are rated from 6,000 to 30,000 Btu and no electricity is required to operate them. The Radiant SR-10T, SR-18T, and SR-30T, and the Blue Flame BF-10 ...

Hot air rises. And so do hot exhaust gases from a water heater. But if an exhaust vent slopes downward, as this one does, ...

Powervent water heaters have become the standard for new construction homes here in Minnesota, but are they really that great? As I mentioned in my last blog post about natural draft water heaters, a ...