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not much wrong with them i suppose. the ferroli is temperamental and very noisy. the vaillant seems ok. the whole system is a little odd, there is a thermostat halfway up the stairs, so when one boiler warms downstairs, the warm air reaches the thermostat and turns off the upstairs boiler...

i am renovating an old property, and have come to the point of needing a heating system. i have fixed the roof, insulated it, and replaced 21 draughty windows with new double glazed ones. currently the house has 2 combi boilers fitted, one serving hot water downstairs and heating upstairs, the...