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    Help identifying valve function

    Thanks, yeah I think I'll drain everything like I did last time. But what about these 2 red valves? I fiddled and closed them (stupidly) thinking it'd prevent the tank from filling, and I'm doubting if the top one was already closed or not ... So that's why I'd like to understand their purpose.
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    [SOLVED] Is there a piece to extend a flexible tap hose?

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    [SOLVED] Contamination CH water into HW tank?

    Thank you all. I eventually also found a nice article explaining this. I guess I wasn't searching with the right words... Plumbing is very stressful indeed...
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    [SOLVED] Contamination CH water into HW tank?

    Hi, yes I have a HW cylinder in my airing cupboard in spare bedroom. I'm just confused about how the system works, how can the boiler heat both CH water and domestic HW at the same time without mixing them? Both waters go through the boiler using the same pipe, right?
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    [SOLVED] Contamination CH water into HW tank?

    Hello, sorry if this is a stupid question... Couldn't find the answer anywhere. I have a condensing boiler with an open-vented CH system. I recently drained the CH and added inhibitor via the F&E tank. But if I turn both HW and CH on at the same time, will my HW tank be contaminated with the...
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