We have a 4,000 foot, 2-story, 1984 Deck house. It has vaulted ceilings, lots of south-facing glass, wallboard heat and five heated zones. We live in southern Connecticut. The original Utica oil-fired boiler is shot. It has our hot water supply incorporated into it. I am contemplating switching...

I have a 75 Gallon Natural Gas State Select Water Heater. Model # PR675NRVTZ. It has a fan on top that vents the gas to the outside. Normally, this fan only runs when the water is being heated. Now, the fan runs constantly eben when the water is not being heated. I do not have the wiring diagram,...

I have a 75 Gallon Natural Gas State Select Water Heater. Model # PR675NRVTZ. It has a fan on top that vents the gas to the outside. Normally, this fan only runs when the water is being heated. Now, the fan runs constantly eben when the water is not being heated. I do not have the wiring diagram,...

A couple of years ago, I replaced our old mercury style thermostat with a digital one. It worked fine for a while. Maybe a year later, we noticed that the heat would kick on and off fine, however, the fan blows constantly (usually blowing unheated air). The only way to turn off the blowing is...