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Thread: Black or dark coloured HR92?

  1. #1
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    Default Black or dark coloured HR92?

    I have a couple of anthracite radiators against dark panelled walls. The white HR92 sticks out like a sore thumb.

    Has anyone come up with a more eye-pleasing solution? I'm assuming spraying them is not a good idea!

  2. #2
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    Spraying a HR80 is probably OK because it has a vent for the sensor. And HR92 might not be too happy being coated with paint.

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    I have been wondering the same thing as although I've recently fitted an Evohome system with HR92 to all radiators which is fine, but we will soon be moving to a period property with cast iron rads in a powder coated green colour. I don't think there is any reason why they couldn't be painted, but I think I would want to strip them down and properly rub down, primer and paint the components before reassembly rather than just blasting the complete unit with a spray can. The HR91 probably would be a bit easier although personally I prefer the HR92 with the display.
    But don't know how possible or practical this is, probably get a bit tedious let alone voiding the warranties!

  4. #4
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    If you use a remote temperature sensor then I see no reason why not.

  5. #5
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    Quote Originally Posted by bruce_miranda View Post
    If you use a remote temperature sensor then I see no reason why not.
    The man's a genius! I'll look into that, thank you.

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    Quote Originally Posted by bruce_miranda View Post
    If you use a remote temperature sensor then I see no reason why not.
    Why would the internal temperature sensor no longer be suitable? The colour of the casing only matters in terms of solar gain surely, which I would think would be insignificant compared to the ambient temperature of the room.

  7. #7
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    Think of the coat of paint as a jacket.

  8. #8
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    I very much doubt a layer of paint will have any significant insulation properties.

  9. #9
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    Quote Originally Posted by benwillcox View Post
    I have been wondering the same thing as although I've recently fitted an Evohome system with HR92 to all radiators which is fine, but we will soon be moving to a period property with cast iron rads in a powder coated green colour. I don't think there is any reason why they couldn't be painted, but I think I would want to strip them down and properly rub down, primer and paint the components before reassembly rather than just blasting the complete unit with a spray can. The HR91 probably would be a bit easier although personally I prefer the HR92 with the display.
    But don't know how possible or practical this is, probably get a bit tedious let alone voiding the warranties!
    Having stripped down an HR92 twice to repair it (from toddler damage) I would not recommend stripping them down just to paint them. It relies on a series of very flimsy plastic interlock clips to hold it together and it is VERY easy to snap one of them. Even though I was careful and have a lot of experience repairing electronics I still managed to break one of the tabs during disassembly (partly because it's hard to know where they are until it's already apart) and ended up having to use glue during the reassembly. They're not built with disassembly in mind.

    You're probably better off doing something masking off items like the screen and using spray paint if you really insist on painting them.
    Last edited by DBMandrake; 5th November 2020 at 10:13 AM.

  10. #10
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    Quote Originally Posted by benwillcox View Post
    Why would the internal temperature sensor no longer be suitable? The colour of the casing only matters in terms of solar gain surely, which I would think would be insignificant compared to the ambient temperature of the room.
    You'll get "solar gain" from dark paint from the infrared radiation directly from the radiator as well. Heat directly from the radiator to the HR92 is already quite a big factor in causing a temperature offset when they are white.

    Also I don't know whether the radiators you're talking about have convector fins or not - if they don't then that tends to exaggerate the localised heating effects of the HR92, in short, sensing the room temperature from an HR92 is even more inaccurate with radiators which don't convect well as they don't draw enough cold air across the floor to the sensor and rely more on direct infrared radiation to heat the room.

    With that type of radiator I would be wanting to use a remote sensor regardless of painting the HR92 black or not. YMMV.

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