I am in the process of replacing 23 yr old gas furnace and AC and was thinking about just replacing 23 yr old gas water heater tank around the same time (both in garage.) The existing is a typical 50 gallon / 40k btu tank and I can say that we always have the hot water we need when we need it. So I plan to replace with a Bradford White tank with same specs but was curious about savings or other advantages/disadvantages in going with a powered damper? I have a free outlet on the wall near the tank. Water heater is located in an unconditioned garage with insulated walls and insulated garage doors, so temps don't get too crazy either way.