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Viessmann Vitola 200 w/ Riello Stack Temp @ 254
I was in a mechanical room the other day drooling over a boiler combo I've comtemplated for my home (If money wasn't a concern). Viessmann Vitola 200 w/ a Riello F10 burner. It was a mixed system with both radiant floor and baseboard. The service folder was there so I started checking it out and noticed on the factory burner test sheet the gas anaylsis was as follows:
T. Air- 74F
I couldn't find any notations from the installer if he'd corrected this, but why would the factory test be set up like this? In the brochure for the boiler it states a net stack temp of 329 degrees with a water temp of 167. I know this boiler is supposed to be great at handling ultra-low return temps, but what about stack temps. Could too low a stack temp harm a boiler with no low limit?
Is the danger in low stack temp really about protecting the flue liner?