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my designer [ im installing} really seems to hate boilers for radiant he says the low flow 1gpm burns them out and they are too expensive when tankless water heater are better, this is the opposite of everything ive read, but hes got a lot of experience and though ive done a fair amount of hvac and plumbing even a bit of radiant im no expert . i thought he was maybe operating on old information since hes kind of old but hes full of numbers specs etc i know enough to know hes not bullshitting but not enough to know if maybe hes just got a maverick perspective worth considering. i asked if it was the condensation from the low temp that burnd them out thinkng he didnt get the whole stainless modcon thing but he says no its the thin wall tubes get hot spots on low flow high btu i thought the tubes were now usually in a block to heat exchange for a dhw loop. any thoughts, if you guys are adament recomend a boiler i was lnterested in triangle tubes newer also dans recomended one on the home page here , this guy swears by tagagi t2s
im doing 5000 sf 5 story brick in brooklyn