For vented products, check that the vent is free of anything combustible or ... But if there’s visible damage to the heater, or if the gas company disconnects service and leaves a red tag ...

Water is emitted from burning natural gas. Using a vent-free gas heater is like running a humidifier. It often adds to moisture problems. Even houses that tend to be dry may suffer from moisture ...

gas water heaters, gas or oil furnaces, and traditional fireplaces must have properly sized and blockage-free flues in order to vent properly. Making matters worse, even properly installed ...