Evening everyone,

I have been reading these forums for a while gaining some great ideas for some renovation work I知 doing on my house, but am now a bit stuck. I have trawled through here and the rest of the web and can't find a definite answer to my query so am hoping for some help/ advice.

I have a system boiler, manifold for the underfloor heating (5 zones) on the ground floor and radiators on the first floor. The system is set up with 2 two port zone valves, one for the manifold and one for upstairs heating.

I have bought two BDR91 relay boxes, the HCC80R undefloor heating controller, the evohome controller and 4 HR92 radiator controllers. I was hoping that I could control all of this from one evohome controller, however, from what I have read, this is not possible, at least not in the way I would hope.

For the underfloor heating, the configuration plan in the installation manual when using the evohome controller, suggests that it is the evohome controller that talks to the BDR91 (I assume when the BDR91 is set up as a boiler relay), however, it also appears possible that the HCC80R can talk directly to the BDR91 which I hope can be used to open the zone valve and then I can use the standard set up to configure and control each zone. Has anyone done it like this and is this the way it works?

For the radiator heating, it looks like I would have to set up the second BDR91 as a Boiler Relay and then configure the system with the HR92's, however I think the implication of this is that every time the underfloor heating zones call for heat, this will also open up the upstairs heating. This isn稚 the end of the world, but I知 hoping to understand if there is a better way?

The other option would be to buy another evohome controller, however, I would rather keep the controls central if possible.

Hopefully someone can point me in the right direction of what i can do?

Many thanks,