Boiler Making Loud Banging Noise

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  • espresso
    espresso Posts: 16,446 Forumite
    First Post First Anniversary Combo Breaker
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    Thank you for your input. But I'm still confused. The indirect circuit can't be entirely separate from the main part of the tank (the water which is used). I say that because I drained the indirect circuit once or twice, and all other parts of the system too. Then when water flowed back into the system it refilled the indirect circuit os there is at least a one-way link.

    I'm fairly certain I caused the problems in the first place by draining the system of chemicals and then not replacing them afterwards.

    Does anyone know if there is a one-way valve, please?

    Regards
    George

    You may have a single feed indirect hot water cylinder and not the more normal standard indirect hot water cylinder.

    HTH
    :doh: Blue text on this forum usually signifies hyperlinks, so click on them!..:wall:
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