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![combined.png combined.png](https://cdn.diynot.com/data/attachments/90/90757-16e81a22227ca895454ee9ef99820e69.jpg)
![HIVE-UP2.png HIVE-UP2.png](https://cdn.diynot.com/data/attachments/90/90758-ea7b0944eee5f820f20a00546a7ed0ee.jpg)
![IMAG0451.jpg IMAG0451.jpg](https://cdn.diynot.com/data/attachments/90/90759-887dcdf7eb69613d58fc49ff19aa5a88.jpg)
![nest-heat-link-1.png nest-heat-link-1.png](https://cdn.diynot.com/data/attachments/90/90760-a664366b3c4304ff3e0ac8bc11f437eb.jpg)
![nest-heat-link-y-plan.png nest-heat-link-y-plan.png](https://cdn.diynot.com/data/attachments/90/90761-31c9ab7e7ecff28f18f9e92b6509d671.jpg)
I'll start with an explanation of what I have and where I would like to get to and will drop a few photos here too.
I have a Gas fired Worcester Bosh 24Ri boiler and a hot water cylinder, there is a mid position valve controlling the hot water / central heating so must be a Y-plan setup.
I have a British Gas UP2 timer control ( Drayton LP lifestyle or LP722 rebadge I believe ) and WR1 receiver and T4 RF Wireless Thermostat.
The UP2 control is fitted underneath the Boiler in the kitchen, I have supplied a picture of the backplate
The WR1 receiver is upstairs next to the junction box and hot water cylinder.
The T4 RF wireless thermostat is in the hallway ( battery operated )
( The manual for Hive 2nd gen states the Hive receiver can be fitted directly onto the UP2 backplate as its the same config / backplate )
(The nest heat link would require some rewiring )
My concern is that the Hive 2nd gen wiring diagram shows connections for 7 wires including earth, my UP2 backplate only has 6 wires connected and is missing anything in terminal 2 (usually for Heating Off Normally Closed) . My system currently operates fine so am wondering does this wire need to be connected for the Hive 2nd gen receiver ?
Also for the Nest 3rd Gen heatlink, the y-plan wiring diagram shows that the Heating Off NC terminal doesn't need connecting ( matching my backplate and current wiring) but has terminal 2 for heating relay common and terminal 5 for hot water relay common ( can these both be bridged from permanent live as per wiring diagram for nest y-plan)
In both scenarios, would it also be just a matter of disconnecting the cables from the existing WR1 receiver from the junction box. Would the Junction box require any rewiring or modification ?
I am trying to work out whether one system will be simpler to install than the other and also how much it will cost for a pro to install all of this as I believe the Nest Pro installers will assess and quote accordingly and I don't want to be ignorant of whats actually required and be overcharged at all or fed BS to "justify" a hefty install quote.
Thanks for any help and let me know if further details are required for any of this.