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    Sealed system boilers work in a similar manner as conventional
    Added: 2020-05-09 | Category: one | Comments: 0

    Sealed system boilers work in a similar manner as conventional boilers, where they indirectly heat a separate store of domestic hot water system boilers are designed for use with unvented cylinders unvented cylinders don’t require a separate header tank in the loft they are feed directly from mains water and.