Connecting HeatMiser UH8 to Vaillant system boiler


14 Sep 2015
Reaction score
United Kingdom
Hello everyone,

Could do with some advice please

This is my current setup:

Vaillant ecotec plus 637 system boiler
Unistor unvented cylinder
Vr66 wiring centre
Vrc 470f
S plan system

Now I have just had underfloor heating installed and a HeatMiser UH8 wiring centre, a new motorised valve for the underfloor heating has been installed, but none of it has been wired up yet.

I also want to add a new Nest thermostat 3rd generation to control my hot water and central heating and do away with the VRC 470f. From my understanding I would have to do away with the VR66 wiring centre. My underfloor heating will be controlled via HeatMiser slim thermostats and actuators.

My questions are what would be the preferable way to connect all this up, use just the HeatMiser UH8 or have a standard S plan wiring centre setup and then connect to that?

Also does anyone have any wiring schematics to achieve this?

Any help would be very much appreciated.

Thank you in advance.
Sponsored Links

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local