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a water tank (above the bathroom)
A big cylindrical sealed one (like a hot water cylinder) with lots of pipes attached, or a rectangular plastic/fibreglass one with an open top?
The red cylinder looks like an expansion vessel for an unvented system, although maybe you can get combi boilers which don't have an internal expansion vessel and need an external one?
rhowe
@Cupcakes
Yup I've got a water tank (above the bathroom) and an expansion tank (next to the boiler).
I thought the system attached to the water tank was vented and therefore not susceptible to airlock?