Smart thermostat set up

edited 12 December 2022 at 5:46PM in In my home (includes DIY) MoneySaving
2 replies 209 views
the_sphinx82the_sphinx82 Forumite
18 Posts
10 Posts
Hello, I wish to install a new smart thermostat to my combi boiler Vailant ecotec pro24. I have a box on the wall, that I think it might be an old thermostat (and the previous owners must have lost the remote part, it may be this ). Should it be easy to replace it with a smart thermostat by myself?Any advice? Thanks for your help 


  • womble12345womble12345 Forumite
    560 Posts
    Part of the Furniture 500 Posts
    I installed a Hive system myself, take a look online at the Hive installation manual. The hub was wired in by the boiler, the wireless controller went where the old thermostat was. The tricky bit is figuring out which wire does what on the old controller.
  • edited 12 December 2022 at 5:40PM
    bob_a_builderbob_a_builder Forumite
    2.2K Posts
    Part of the Furniture 1,000 Posts Name Dropper
    edited 12 December 2022 at 5:40PM
    Your link wasn't working ( an extra ')'  ) on the end 
    Here is a link to the manual of your Stat  - LINK which shows current wiring 

    The Nest E Smart thermostat is designed to replace existing thermostats in that it duplicates the existing connections you have there  i.e. the NO and Com(mon) connections and as such could replace that control box ( or indeed be connected in parallel)

    The Next E  equivalent box ( actually a grey circle ) is battery powered - just requires 2 connections connecting to the existing NO and Com connections in your existing control box (in your picture)

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