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went to a breakdown on a five years old vitodens 100 the other day and the flow switch was hissing water out of the top of the part, last year the hydroblock had the same fault and customer is now having a worcester fitted in his new extention.

looking at the amount of double radiators you have on the system you will proberly have to put an extra expantion vessel on as the one in boiler works by volume of water in the system, not by heat output. 8)