I have an Ultra 80 installed supplying Domestic hot h20, radiant floor and baseboard heat. When it works.. it works great! Quiet, effecient. However, it has been installed for only 2 years and has left me without heat or hot water twice and everal service calls for minor things also. Not what I expected from a high end boiler!
The failures come from a poorly designed outside air intake inlet. The inlet happens to be just about the vent motor. Well, when the cold outside air hits the nice warm air inside the boiler in condenses.. and drips on the motor... shorting it out. This has happened twice and WeilMclain claims they have no knowledge of a design problem... The installer does not stock the part.. so I'm without heat or hot H20 for a week or more... Not good in Michigan winter! Had I known about this, I would have gone for the more expensive, yet apparently more reliable and TESTED Viessmam. Good luck. Hope this helps.