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I have a Vaillant Ecotec plus 637. The pump overrun is set to 5 mins (default setting) When the boiler cycles at flow temperatures around 50C the pump overrun drops flow temperatures to about 40C the radiators around the house start making a banging noise almost as if the radiators are cooling...

I do have a tap where the is a big difference between pressures - hot tap has very high pressure which I didn't understand because another hot tap two feet away was fine and they are both from the same pressurised cylinder

Thanks - what happens if the pressure to mixer in the body outlets are not at the same pressure?

Can someone explain to me what a balanced cold water supply is. I've updated my system from vented to unvented after some extension work and am trying to understand the reasons why turning on cold water taps from the old part of the house cause a banging noise in a wall between the new...

Hi - I have an unvented system . the hot water is directly connected to the pressurised system and the cold water is connected to the mains. I have two problems 1) The hot water from the upstairs bath tap is very high pressure but downstairs shower low pressure. 2) For the mixer taps, hot...

Just have a white one - central heating has vaillant boiler - no vessel

That was my understanding - so there is no connection between expansion vessel and central heating system?

Hi...I need some help understanding an issue with my expansion vessel connected to my unvented cylinder. My understanding is the expansion vessel helps regulate the pressure in my unvented hot water system. Does the expansion vessel performance affect the central heating system? Reason I ask is...

yes they are 1/4 turn taps

thanks - very educational. If you have an unbalanced supply can it cause noise problems in the pipes? reason I ask is I get loud banging noises around the area of the taps.

Sorry for sounding stupid but what you mean by balanced supply and how do i check my mains pressure?

Apologies - I have an unvented hot water system - water cylinder is 290L and boiler is 37KW. I had the mains pipe renewed during building work. Let me know if you need any other information. Thanks

I'm trying to figure out why my hot water tap pressure is much higher than my cold water tap pressure. Can someone help me understand this.

@opps - I will need to put the foam idea to the plumber - I do think noise is coming from pipes in a boxed section @Alec_t - I don't think I have a water tank with a float valve @denso 13 - Yes the main stopcock in the house was replaced Thanks everyone for your replies

Shower pressure is already borderline as had a pump on the shower when it was vented and now it's unvented shower not as good. Don't understand why all the noise from all the taps and toilets is located in one part of the house. Might have to investigate getting the arrestors you mentioned

thanks...if I reduce water pressure at mains will that affect the pressure of shower or is that controlled by the unvented cylinder?

I seem to have a problem with a banging sound in one upstairs room (bathroom). When the toilet is flushed and sink tap closed I get a banging sound in one corner. I also get the same sound in the same place when I flush a downstairs toilet. I also get same sound when I close a kitchen tap which...

I'm not judging my plumber based on a few posts on this forum My confidence in my plumber isn't high for a numbers of reasons 1) It took me a year of chasing to get him to complete the commissioning document. He didn't register the boiler with Vaillant so my 10yr warranty was worthless. And...

what do you think the problem might be?

thanks - some of my noisy radiators do not have TRVs ( bathrooms and Hallway where the Thermostat was originally fitted)