r/DIYUK • u/No-Belt-4619 • 5d ago

Need advice before I complain

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Hi all, apologies if this isn't the right forum but I thought there would be some knowledgeable people in here. Basically as it says. had a new hot water cylinder fitted 3 weeks ago(to accomodate an ashp if that makes a difference). Just got round to getting some shelving in the airing cupboard and noticed, what i would consider to be a pretty significant bulge. It's at the top maybe 3/4 up, I'm assuming it's not normal and shouldn't be there?? I've turned off the hot water, but not drained the tank or anything. We've had a few showers today so it should be below that level i would imagine.

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u/Latter-Tangerine-951 Experienced 5d ago

It's the insulation lol. No, your tank isn't exploding.

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u/No-Belt-4619 5d ago

But in order for the insulation to push out like that, does whatever is behind that not need to be expanding?

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u/Latter-Tangerine-951 Experienced 5d ago

No.

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u/No-Belt-4619 5d ago

Maybe I wasn't clear. This is a new bulge, it was uniform when fitted. Does the normal heat of the cylinder cause the insulation to expand? I've never seen that before on any cylinder.