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Thread: Viessmann 100W combi (2021 version ) Opentherm

  1. #11
    Automated Home Jr Member
    Join Date
    Dec 2015
    Posts
    19

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    Boiler has in built wireless that is is connected to house wifi .

  2. #12
    Automated Home Jr Member
    Join Date
    Jan 2021
    Posts
    11

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    Hi JCK,
    Thank you for your answer. Do you know, by any chance, what is the lowest flow temperature available for this boiler ?
    Also, can someone please explain what is the reason for downgrading the boiler's nominal power output ? Generally speaking, are there any other boiler settings that should be correlated with the power cut back ?

    Thank you !

  3. #13
    Automated Home Legend
    Join Date
    Jul 2014
    Posts
    2,307

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    The boiler should only create as much heat as can be shifted away from it and consumed. The rating determines how fast the water is heated. In my case I had to derate my 38Kw boiler because the pipe sizes and pump couldn't move that hot water away from the boiler fast enough. Most boilers are sized for the whole house and HW all together. But with Evohome, you aren't ever heating the whole house at once.

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