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Viessmann Vitodens 200 or Triangle tube prestige solo
Need suggestions, I live in the Seattle Tacoma area and in the process of replacing and old oil burning Wm P268v-w DOE 86 with a natural gas Mod/Con. I have narrowed my choices to the Viessmann Vitodens 200 series or the Triangle Tube Prestige Solo series. My out door design temperature is 25 F and my house is a 1965 2550 sq ft multi level home. Ashrae heat loss calculation came out at ~70000btu and the slant/fin calculator and one other came in at ~62000btu. I originally purchased a TT prestige solo 110 but have been second guessing my choice thinking that the boiler is about 20% over sized. I really like the new viessmann vitodens 200 b2ha with a modulation output between 10.9 and 61kbtus. Yes I realize this boiler this boiler is a little undersized but there is a lot of info out there saying btu losses are over inflated(fudge factor). Triangle tube solo 60 is another option but even more so undersized. My current heating element are fintube base board that will eventually be upgraded to staple up and I floor light gypsum top pore. I will also be adding a TT smart indirect for dwh. What are your thought or suggestions?