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I think I'm in love

Stephen MinnichStephen Minnich Posts: 1,970Member
I was able to put my hands and eyes on a Viessmann CU3A today. Wow! Easy to service, 13.5 gallons of water in the smallest model, and what looks like a bullet-proof HX and burner. It's in my shop now and will be installing my first one before long. I'd love to hear what others think of it.


Comments

  • Robert O'BrienRobert O'Brien Posts: 2,989Member
    Have only installed one, very nice! Takes up some space though
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  • Stephen MinnichStephen Minnich Posts: 1,970Member
    edited April 16
    Yeah its a big one but still takes up less room than a boiler AND a buffer tank : )

  • Danny ScullyDanny Scully Posts: 933Member
    Tank...enough said :wink:
  • SuperJSuperJ Posts: 194Member
    Variable primary is so simple and elegant.
    High mass, high efficiency makes so much sense. I've got the poor mans version with a Polaris and hacked controls. I live 5 minutes from the Viessmann factory in Waterloo, only got to inside once though.
  • Solid_Fuel_ManSolid_Fuel_Man Posts: 935Member
    Pretty sure the HX has been used in Europe for many years, just made it over here 3 years ago AFAIK.
    Master electrician specialising in boiler and burner controls, multiple fuel systems, radiant system controls, building controls, and universal refrigeration tech.
  • hot rodhot rod Posts: 8,123Member
    13 gallons is nice. It takes a large cast boiler to get that type of water content these days, most are under 5 gallon capacity

    maybe fixed output cast boilers are the application need for buffer tanks
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    The magic is in hydronics, and hydronics is in me
  • We just placed our first CU3A in the boiler room yesterday and attended the Viessmann classes in Warwick, RI last month to go over installation and servicing.
    I love it that we are returning to high volume boilers, this time with condensing technology.
    Often wrong, never in doubt.
  • Stephen MinnichStephen Minnich Posts: 1,970Member
    I have not taken the classes yet but I will. Meanwhile, I'll read every manual as if it were a textbook with highlighter in hand.

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