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Fire Tube Heat Exchangers taking hold
It appears as though ACV has been marketing their fire tube heat exchangers to more than a few manufacturers with successful results. If I'm not mistaken, the majority of these exchangers are made with 439 stainless steel which I'm guessing is significantly cheaper than Nickel carrying stainless steels in the 300 series, especially 316 L, and even more so with 316 Ti. I've noticed pricing with boilers that carry this new exchanger seems 'very competitive' lately as well from more than a few manufacturers. Lochinvar, IBC, and now NY Thermal (Trinity Fire Tube - just saw an add for it today) on top of the already existing Triangle Tube are boilers that I know of that now have models with this heat exchanger. It seems like Giannoni has some competition, and I wonder if Viessmann's heat exchanger will survive a redesign? It's a good heat exchanger but I'd imagine the Germans would have to acknowledge the electricity reduction from going with a heat exchanger with siginficantly less pressure drop.
Class 'A' Gas Fitter - Certified Hydronic Systems Designer - Journeyman Plumber