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No thermstat on boiler. Is it possible to install one?

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  • markin
    markin Posts: 3,860 Forumite
    Sixth Anniversary 1,000 Posts Name Dropper Photogenic
    grumbler said:
    markin said:

    You could also just use a marker pen to mark 21c.
    This is the CH water temperature. The OP wants a room thermostat.

    No its a built in thermostat, The frost star is a big hint, And the manual confirms it.
  • ThisIsWeird
    ThisIsWeird Posts: 7,935 Forumite
    1,000 Posts Second Anniversary Name Dropper
    edited 2 November 2023 at 11:21PM
    Leard91 said:



    A couple of points from that pic. The first is the timer having a section for DHW - on a combi. Weird, until I looked it up for a similar recent thread - the DHW timer is for the 'preheat' feature. Nice.
    The other is the sight of two cables coming out its bottom. 
    Learn, could you confirm if there are, please? And, where do they go?
  • glennevis
    glennevis Posts: 733 Forumite
    Eighth Anniversary 500 Posts Photogenic Name Dropper
    The money saving solution which I  did was to fit a Danfoss RMT 230 manual thermostat. £15 on ebay and no recurring cost as no batteries to buy.
  • markin said:
    grumbler said:
    markin said:

    You could also just use a marker pen to mark 21c.
    This is the CH water temperature. The OP wants a room thermostat.

    No its a built in thermostat, The frost star is a big hint, And the manual confirms it.
    it's a built in thermostat, for the CH water.  will go from 40-80 ish degrees C
  • FreeBear said:
    markin said: You have to remove the case it seems, So needs a Gas safe person?  Probably a 20min job when its being serviced.
    It certainly looks that way. If it were possible to access the terminal block without removing the casing, I'd say "go ahead". But the minute you remove the casing, you need to be Gas Safe registered. 

    it's possible to access the required terminal block without breaking the combustion chamber seal, so you don't actually need to be GS reg to fit a thermostat.
    https://www.gassaferegister.co.uk/media/1449/who-can-legally-work-on-a-gas-appliance-factsheet.pdf

  • ThisIsWeird
    ThisIsWeird Posts: 7,935 Forumite
    1,000 Posts Second Anniversary Name Dropper
    I'd imagine most boilers are like mine - the front panel is purely decorative. My GW's is held on by only two screws, and then lifts off. The front control panel then hinges forwards, and gives access to all the electrical connections.
    That is surely a standard design - t'would be nuts to have the PCB and controls within a combustion-controlled area, and double-nuts for your sparky to refuse to write a boiler 'cos they ain't GasSafe.
    Anyway, the instructions will hopefully make this clear.
  • Albermarle
    Albermarle Posts: 27,843 Forumite
    10,000 Posts Seventh Anniversary Name Dropper
    markin said:
    grumbler said:
    markin said:

    You could also just use a marker pen to mark 21c.
    This is the CH water temperature. The OP wants a room thermostat.

    No its a built in thermostat, The frost star is a big hint, And the manual confirms it.
    it's a built in thermostat, for the CH water.  will go from 40-80 ish degrees C
    I have a similar boiler with a similar dial for the boiler flow temperature. The manual says 35 to 82 degrees.

  • Leard91
    Leard91 Posts: 46 Forumite
    Tenth Anniversary 10 Posts Name Dropper Combo Breaker
    Learn, how electrically competent are you. Can you wire a plug with your eyes closed?
    And do you have a preferred Smart prog stat?

    I have an electrician for a Dad fortunately, who can probably install it if I can't.
  • markin
    markin Posts: 3,860 Forumite
    Sixth Anniversary 1,000 Posts Name Dropper Photogenic
    markin said:
    grumbler said:
    markin said:

    You could also just use a marker pen to mark 21c.
    This is the CH water temperature. The OP wants a room thermostat.

    No its a built in thermostat, The frost star is a big hint, And the manual confirms it.
    it's a built in thermostat, for the CH water.  will go from 40-80 ish degrees C
    Did you read the manual? It clearly calls it a Room Stat, and is where you would wire in a remote room stat.


    ""230V room stat/clock (ST10): The diagram shows the option of roomstat with programmer or roomstat only.""
  • Leard91
    Leard91 Posts: 46 Forumite
    Tenth Anniversary 10 Posts Name Dropper Combo Breaker
    Leard91 said:



    A couple of points from that pic. The first is the timer having a section for DHW - on a combi. Weird, until I looked it up for a similar recent thread - the DHW timer is for the 'preheat' feature. Nice.
    The other is the sight of two cables coming out its bottom. 
    Learn, could you confirm if there are, please? And, where do they go?

    One is just the mains that goes around the back. The other isn't an electrical cable. It's just the water feed.
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