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Thank you so much, diagram is great, I actually understand it. And Alec, I will ask and in the meantime will not set pump on the wi fi room thermostat/control at all. From what I had looked up on the www I'd sort of garnered that a combi boiler didn't need it. If I find I don't have hot water...

Definately do have a pump. thanks for the responses. Dave if I turn it off then surely the hot water wont get pumped through to the taps? things were much easier before I got this new combi....bring back my old tank in the attic and copper one in the airing cupboard any day....I understood how...

Do I need to have my circulation pump for my ecoTEC 838 on constantly via the vrt392f room thermostat radio transmission or should I set it to come on at the same time I have set the timer parameters to (which are the same for heating and water)? Thank you