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My Viessmann Vitopend 100 boiler has been struggling with high pressure (going above 3 bar when the heating's on) for some time now. This morning, a repair guy installed a new expansion vessel. He did not replace the old one, just connected it between the two valves you use to refill the...

Whenever I turn the heating on or simply run hot water (from any tap), within 5 seconds of the burners igniting, my Viessman Vitopend 100 boiler gets loud, like an airplane taking off. This lasts for about 5 seconds, then it stops. You can hear it here: https://streamable.com/9v8h97. (At the...

I have a new shower that has worked fine, albeit with low hot water pressure, for a couple of months. Now it starts hot, but then goes cold completely, sometimes after a couple of minutes, sometimes after less than 30 seconds. Meanwhile, on the side of the bathroom sink, there are no issues...

We recently renovated our bathroom and installed one of these: https://www.x2o.be/nl/blaufoss-smartbox-softline-inbouw-regendoucheset-thermostatische-kraan-brushed-gunmetal-kra-79636-95415-92943 (You can find the technical documentation in the Downloads section at the bottom of the page.) Our...

I have a Viessman Vitopend 100 combi boiler that loses .1 to .3 bar of pressure each time I turn off the heating (depending on how long it's been running). I ran a short test the other day where I turned the heating on for only 5-10 seconds. I could hear the ignition and the water pump kick in...

I have a combi boiler with 7 radiators in the apartment. When I turn the heating on, only 4/7 get hot. The remaining 3 are completely cold. It's as if there's something blocking the flow between radiators 4 and 5. I've bled the radiators (hardly any air came out) and restored the pressure in...