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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.

Buy individually or both books together. Delivery is free!

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    • CommentAuthormikrt
    • CommentTimeSep 23rd 2018
    Hi all,

    My wood pellet boiler is out of action for a week or so awaiting spares.

    My issue is I think that the immersion heater thermostat is no good (and was never fit for purpose)

    I have done some research on my model number VLK3304 and it is intentionally made without a rest facility if it overheats. See quote below from brochure.

    "The unique, patented ‘One shot’ Over Temperature sensing action is impossible to reset by hand, offering a degree of safety by ensuring the control stat which caused the over temperature condition is replaced and nol merely reset to fail again"

    The thing is, I have solar coils in the same tank, and during Summer months, the whole tank temperature exceeds 90oC, the cut out for thermostat I think is 81oC.

    So I'm about to buy a different model with a reset button, is this something anybody has had issues with before?

    Yes. I have solar thermal and an Immersion heater on a MegaFlow tank. The overtemperature trip on the Immersion trips the immersion, and acts to trip the boiler as well.
    Essentially I never use the Immersion - I'm on gas.
    However, the immersion trip point was set at about 60C initially, and one hot summer, the tank got to 70C+ on the Solar. When It started raining, and no sun, I found the boiler not running because the trip was holding it off.
    Manual reset, all good. Manual reset was a faff, as you have to open things up, screwdriver job.
    I have reset the trip to 80C, which the solar never gets to, so its been all good since then.
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