90% plus boilers, worth it in this case?
Question: High efficiency (90% plus) vs. lower efficiency (86% or so) gas fired boilers. I’m a remodeler in the twin cities. We’re working on a basement remodel that will get in floor heat, then all the first floor radiators go away and the basement ceiling will be under floor heat for the first floor. The second floor original (1920’s) radiators will remain. Our heating contractor is against the high efficiency boilers: He says- gunk in the original radiatiors will dampen the efficincy of the smaller coil area. Warranty/callback issues, unproven track record. Expense, greater equipment cost, plus higher piping costs b/c of this case where we have to feed higher and lower temps. to radiators vs. in floor, underfloor. Cast iron (86% eff.) are cheaper, more reliable, ready to pipe for this application. What’s the deal how can I sell this to homeowners who want to pay more for more efficiency? Is our heating guy stuck in the past or legit. concerns?
Thanks for any info.