Vaillant Ectec 937

[BGTECHY]

Hi, guys and gals.... I have a vaillant 937 in my house and recently the hot water has begun to feel colder, the outside water temperature of the mains has not even dropped that low yet? I have gas rated it and it is running about 35kw.... The system is clear and has a magnabooster fitted, I am at a bit of a loss now as to what could be causing the problem.

Any ideas?

Cheers Paul.

Is it normal to display 80deg on the display when running the hot tap, I think it is reading the flow thermistors temp but I'm not totally sure.

 

[ianmcd]

you have 35KW gross input to a 37KW output boiler and you call yourself BGtechy ???? what is the flow rate and have you considered a blending problem from a shower or mixer tap ?

 

[BGTECHY]

It's not a slagging match, I've isolated the cold inlet to the shower, and it's still only 41 deg on the dhow outlet pipe from the boiler....