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    Help with Viessman Vitodens 100W temperature

    Hi John Your questions implied you maybe had some light to shed on this. I have answered them in later posts in this thread. Would you care to shine your light? :-)
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    Help with Viessman Vitodens 100W temperature

    Sorry, I have caused confusion. This is not a pressure gauge showing pressure in bar! It’s a little indicator in the LED display, which looks just like the old wifi/mobile signal strength indicator...
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    Help with Viessman Vitodens 100W temperature

    OK so the heating has two zones, upstairs and downstairs. Upstairs has been off for an hour, downstairs still on, so load on boiler reduced. Water temp in boiler with setting dial as high as it will go, is 68deg. The 5 bar indicator indicating how hard boiler is firing (?) shows 3 bars...
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    Help with Viessman Vitodens 100W temperature

    We had the plumber round who carried out the service (to fix a leak in the condensate pipe). Seemed very competent (hard though it is to judge). I guess I should ask him the question I posted here (but wanted to get others’ opinions first so I’m not flying blind)
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    Help with Viessman Vitodens 100W temperature

    3 bed semi detached but quite large (circa 2000 sqft) and old and poorly insulated (at present). Boiler is I believe 17kW. Hot water from taps is pretty hot (not measured temp).
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    Help with Viessman Vitodens 100W temperature

    I would be grateful fir any advice re the following. We have moved into a house with a Viessman Vitodens100W, believed around 7 years old, serviced by previous owners’ plumber last June. Separate hot water cylinder. We noticed that on cold days the radiators were only lukewarm even though room...
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