Hello, I am looking to replace a cast iron boiler with a mod-con. One contract who came by said that he had good support in the area (DC region) with NTI and Triangle Tube. I've heard mixed things about TT plus none of their boilers seem to modulate much. In terms of NTI, what are your thoughts about their lowest output boilers (I'd probably be looking at the Tx81 or even 57 given my approximate heatloss)? It looks like they have a SS heat exchanger, but nothing mentions that they're fire tube, unlike the TFT (although the 154 model only goes down to 15k) - does that imply their durability/reliability may be somewhat less?
In terms of my overall needs: I have two zones, one with 70 feet of fin tube and two sections of 4-foot cast iron baseboard and the other with 50 feet of fin tube, so not sure how low I'd need to go on the minimum modulation number. I haven't had a formal manual J as yet, but my 82% 140k-input 112k-output AFUE boiler (probably a couple points less as the damper is locked in the 'open' position) used about 800 therms over the past year (minus 80 therms for HWH and stove use) to keep my 2000 sq ft moderately well-insulated house at 60-65 degrees.
Thanks!
In terms of my overall needs: I have two zones, one with 70 feet of fin tube and two sections of 4-foot cast iron baseboard and the other with 50 feet of fin tube, so not sure how low I'd need to go on the minimum modulation number. I haven't had a formal manual J as yet, but my 82% 140k-input 112k-output AFUE boiler (probably a couple points less as the damper is locked in the 'open' position) used about 800 therms over the past year (minus 80 therms for HWH and stove use) to keep my 2000 sq ft moderately well-insulated house at 60-65 degrees.
Thanks!