vaillant luke warm water

[pbbuilder]

turbomax plus 824e ch red hot but my hw is only luke warm even with the temp gauge right up does anyone know what this could be its 3 years old and had nothing done to it thanks

 

[Agile]

When I see builders I know that boilers they fit are by unregistered fitters and the system is never powerflushed.

Says it all I suppose "nothing ever done to it" ! I am sure you know that they should be properly serviced every year?

In these circumstances I would expect the plate HE is stuffed full of dirt.

Tony

 

[pbbuilder]

i am a builder but i dont get involved with central heating i leave that to the experts. this boiler is at my house and i have been a bit daft not having it serviced i agree, but it was fitted with all new pipes and rads and had no leaks. do you still think it is dirt causing the problem

 

[Agile]

Well there are several aspects to consider.

You need to measure the flow rate. A 24 kW can only heat about 8 litres per minute to a nearly too hot to touch temp.

It could just be that you just have too high a flow rate.

Tony

 

[pbbuilder]

thanks tony is it easy to turn the flow rate down, do i just turn the stop cock down a bit untill i get it right

 

[ChrisR]

You can turn the basin variety tap down to reduce the flow
Dirt is quite likely but so is the diverter valve, various ways they fail. Do you get more/better HW if the CH is on?
With CH off and cool pipes, put hot tap on, does ch flow pipe (leftmost) get hot - it shouldn't.
Servicing wouldn't have made a jot of difference to these issues.

 

[pbbuilder]

the ch pipes do not get hot when off and water on also no temp diff in hot water with heating on or off

i have turned my stop cock down and it is a bit hotter but im only getting 5-6 litres per min, not 8 as mentioned by tony