Water tank heats up water but temp not high enough

[disc0d4ve]

I wonder if anyone can help me. My girlfriend has and an ACV E Tech W electric boiler/central heating system:

http://www.acv-uk.com/pdf/E-Tech W.pdf

The problem is that the tank appears to be full of hot water (e.g. the pipes coming out of the tank are very hot to touch. The boiler is turned up to 5 (max setting) and the temperature guage on the outside displays approx 85C.

When you turn on the hot water tap (or the shower) the water is never hotter than what I would describe as luke warm. This is the same even if you leave the hot water on for hours on end (note, the water pressure is very good). The water temperature is fine for a shower but too cool for a bath which I dont think is right?

I suspect that the hot water is supplemented by the mains water coming in and that the mix of hot/cold is too high?

Apologies if I'm not explaining the problem very well and I could be way off track with my suspicions above but plumbing is not my field of expertise!

Can anyone help/offer any advice? It would be appreciated.

Cheers,
Dave

 

[cross thread]

never worked on one but suspect that you may have a thermostatic mixing valve on the hot water cylinder outlet ,this may be adustable to give hotter water

 

[disc0d4ve]

never worked on one but suspect that you may have a thermostatic mixing valve on the hot water cylinder outlet ,this may be adustable to give hotter water

Thanks for the reply, I can see a dial with heatguard TMV2 written on with the dial noting min/mix. How do I adjust this as it doesnt seem to move when i try to turn it. I'm not trying too hard as i have no idea if i might break it? Presumably there's a safety/tamper proof element to this? Any ideas?

Thanks again,
Dave