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  1. M

    Boiler adding air into system when hot?

    I previously made a post here about low heat output of the boiler - this has been mostly rectified with a balance however two radiators still only get hot at the top and not at the bottom. Edit: Forgot to mention the boiler is a 26kW Viessmann Vitodens 100-W WB1B :) When the heating/hot...
  2. M

    Viessmann 100 short cycling while warming up, overall low heating?

    Hello, Recently I moved into a property built in 2004, which had a boiler replacement in 2014 with a Viesmann Vitodens 100 WB1B, 26kW. I believe the system is open-vent as there is no pressure gauge, tanks in the loft, a HW cylinder, and what looks to be only a feed and return pipe out of the...
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