coldguy wrote:the heat exchanger: Ok, the photo you were looking at is with the door t(o the big horizontal heat exchager0...open. The two photos following show the same section of the heat exchanger, but with the door shut. I just opened the door for that one photo so everyone could see the tubes in there. I'm assuming thats just an access door to clean out those tubes?
Correct, it is a dryback, firetube boiler (firetube, the heat runs through the pipe as opposed to a water tube boiler where the water runs through the pipe and heat around it).