My boiler was down this summer for a cleaning and I have the 40 Super with the cleaners in the tubes. The cleaners are 1 1/4" twisted flat stock steel and the tubes are 1 1/2" diameter. Theoretically that leaves and 1/8" crud on the inside all the way around in each tube. My temp transfer was great for about a week and then dropped down to really nice and has stayed there since. I really need some 1 7/16" or 1 3/8" twisted flat stock to keep the tubes good and clean with out having to take things apart since I have a lot of idle time and will have until I can get my storage up and running. I wonder how much the crud in the tubes effects the "ideal burn" we are all wanting to have????barnartist said:Thanks for the update Shannon. I'd like to get to where you are, but like you said it is a border line addiction to mess with these boilers.
Today I cleaned out my exchanger tubes (I have the old model that does not include the exterior cleanout arm) and my stack dropped about 100F at normal operating, so I must be making a better air to water echange back there. I was lazy this year to get back there, so I should try and clean out more often.
Any way my point is the built in tube cleaner is really nice but I still have to clean my tubes too and I'm thinking all the time all of us has spent burning with less than the peak fire has left a lot more tubes cruddy than we would like to think. :cheese: