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This is a conventional boiler on an S-plan sealed system. Its the older style greenstar (not the new cylinder HE style) The boiler works a treat when under normal operation, however, if it is firing when the demand finishes e.g. the DHW is satisfied, the valves shut pump stops and temp (if...

Anybody fitted worcester, vaillant or viessmann solar panels?? A mate is wanting me to fit some alongwith an unvented cylinder, just wanting opinions as never done any. Viessmann looks good with the horizontal cylinder, and vaillant looks just plain good, WB might be easyer on the wallet...