06/03/2026
When you have a small room with no combustion air vents, three gas-burning appliances, and a dryer installed right next to the water heater, the dryer can pull a significant amount of air from the room and create negative pressure. In these situations, backdrafting at the water heater becomes very likely because air is pulled back down the flue to satisfy the dryer's air demand. I'm sure most of us already knew this, though. Sorry for wasting your time.