How do I bathroom / kitchen / extension? etc.

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Airhead in reply to @konastab01

Is it not normally external?

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konastab01 in reply to @Airhead

Yeah they are normally inside unless the system is bigger and needs an extra one too

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Airhead in reply to @konastab01

Ahh, most of the ones I see have an external one. I've not seen inside many of them though. Pretty sure the one at home doesn't have an expansion tank in it but it's 20+ years old.

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