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I assumed that if both valves were closed, the new expansion vessel would be isolated from the rest of the system and, hence, have no effect. I gave him a heads-up. He will come back on Saturday to check. If that is indeed the case, he will have no other option but to get the EV off the ground...

Thanks. Yes, I am aware, but I'm in Brussels and most plumbers here don't speak English. (This one was sent by my insurance company.) Here's a better picture of the valve: Does that say anything to you? Also, is there a big difference between a "proper external EV" and this one?

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...

The guy the insurance sent over was a gas engineer (and he's the one who said it was the heat exchanger).

Are we both referring to the sound you hear at the 25-second mark? The actual sound is much louder than what you hear in the video. (Think of an airplane flying overhead.) There was really nothing to notice before as it only started recently.

Thanks. Is there a reason it has started doing this all of a sudden? Anything I can do to fix it?

Would Fernox F2 help in this case (assuming there are 2 heat exchangers and the problem also occurs when simply running hot water using any tap)?

If I understand correctly, the primary heat exchanger heats the central heating system, while the secondary one transfers heat to the domestic water supply. Given that the boiler is making the noise both when requesting hot water from a tap and when turning the central heating on, I am now...

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...

Removed the plate covering the thermostat and noticed these two screws. Turned the red one counterclockwise a bit. Problem solved. Thanks!

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...

I have just tried turning off the hot water on the boiler side, then turning on the hot water, first on the sink side, then on the shower side. Nothing came out of the sink tap, but there was cold water coming out of the showerhead. Does this confirm I have a crossover and the culprit is the...

Any thoughts?

Thanks. I happen to have a spare mixer. According to page 5 of the installation manual, I might be able to replace the "cartridge" (if that's the right term) without demolishing the wall...

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 also noticed that the shower water pressure fluctuates a lot and the water goes cold, and hot, and then cold again quite often and I can hear the boiler kick in every 15-20 seconds or so. Could both problems be related to the PRV?

The pressure you see at the start of the video (around 1.6 bar) was like that before switching the heating on. Again, for the sake of the test, I ran it for only 5 seconds or so, then immediately switched it off. I did not notice it rise, but the drop was quite obvious. I have already checked...

Where exactly should I be looking?

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...

So, turns out the actual problem was the 2-pipe valve which lacked a bypass that would allow the hot water to flow to the other radiators with the TRV closed. Mystery solved. Many thanks for all the help.