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I have a Vaillant Ecotec plus 637 boiler fitted 2 years. I also went from a vented to unvented hotwater system and had underfloor heating fitted in a converted garage. I understand the pump overrun is supposed to protect the boiler heat exchanger from damage but where does the heat go? Reason I...

Thanks for your help - will leave setting at 55C

I'm trying to figure out the best target flow setting for my Vaillant Ecotec plus 637 boiler. What is the acceptable range? It's been set at 55C right now - return is around 40C

not sure how to check that - I do know pressure is around 1bar when cold (30C) to about 1.8 bar at 75C

thank you - sometimes when the water temperature drops my radiators start banging - is that normal?

I have an ecotec plus 637 boiler. I have a question - when the boiler starts ( heating mode 'burner on' when I look at the status) why does the temperature drop first before going up? Is that normal?

Apologies for not being clearer - I'm trying to figure this out as I go along By boiler cycling I mean the boiler goes through the usual checks before the burner goes on then the temperature reading on the boiler (flow temperature) goes up. After a several minutes the burner switches off and...

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.