We...Ok.. Larry did this during summer

canuckDale

Larry and I did this this summer. Larry did it. He's a fine fitter and a great coordinator! I just supply support.

Love those boilers that chug flu-water!
Likely a quick payback. It's a 'hot' building and we can run RW temp <120*F. Regardless of what the engineer said. Because we set the I/O controller down to max out at 140* SW temp last year. And it worked all the long cold winter!
So much for 20* delta T and you need to design for 40* or 60* or . ??..."It will never payback!"

Look at the WHOLE system says Mr. Steam ;-) Thx Dan!

It's a school and things are looking good (gas) 1/2 price during September.

Mike Kraft

Dale & Larry

beautiful work.........and the end result is just as pretty!You must feel so proud to crank one up like that and then watch the payback for the building!

cheese

Boilerpro

Somebody's thinking out there

It's amazing how few take into account internal gains and how it effects real life operating temps and loads of systems. When was the last time you saw a building actually operating at design conditions... no sunlight (perpectual night) for several days, no people inside, no lights in use, no heat generating equipment in use, and a constant -5F and 25 mph wind. Kudos to you! Did you use condensing equipment for the full load or did you just baseload with condensing equipment? I suspect payback becomes very long for the last half of the load using condensing equipment, it probably only be in use less than 100 hours per year. I would think that using much less expensive 82 % ef boilers would make sense for this brief load. Twas wondering about your thoughts on this?

Boilerpro

canuckDale

Ya..

A bit of a crap shoot for sure. BTW they are Fulton Pulse boilers. It only got down to -20*F last winter and the 140* supply water held. The existing firebox boiler had that nice power burner - just push all that heat up the stack and warm the world! If we were getting 50 cents of usuable heat out of every dollar of fuel we burned, I think that would have been the best the old kettle could do. Even at hi-fire and non-condensing , the Fulton's should give us 86%.

Yes, we thought about a fin-tube for full load. But this is a two story building and boiler in the basement. There wasn't room for a B-vent chimney and the 7" SS one in the old flu chase. Not to mention a 6" B-vent DHW heater flu. We would have had to find some room through two floors and it wasn't there. And add the cost of the work and a structural engineer. I want to do just that next year and am looking for a single story energy hog. In fact, I dying to do a Viesmann with a fin-tube back-up but around here you can buy four Fultons for the same price as one Viesmann, which means two buildings with low gas bills instead of one.