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right... I going to back up Alec here a little bit. in reality there will be two figures at work here. 1, the actual heat loss at any give outside temperature and 2, the kw output need to equal and then over come the heat loss to heat the house to any given temp. if you use...

getting better ericmark :lol: but have you tried to get a vc4013 valve in UK? Dont fancy flying over to Syria. At any rate if you wire up as you suggest, I you would not be able to time the hot water, It would keep the cylinder hot 24hr a day 7days a week 365 days a year. Though I do some...

Jez, the wc part is useful in system with two 2-port valves as you you can still time the dhw and though not stated by eco you can keep an intergas a combi. Which gives can give you two different dhw temperature and a low temp ch temp.

I think EFLImpudence posting that picture sums up the problem quite nicely... you can't wire up a modern boiler with-out permanent live and the pump is directly wired to the boiler nowadays for pump over run... if you were the sparky on site and followed that wiring diagram I would need to...

Makes perfect sense to me, he wants to dual flow temperature system. One flow temperature for the boiler to CH and another for the DHW. The problem with you electric lads is you dont know why we want to do the thing we do so you dont have the background.

I work in Cleveland, you can find my number in my profile.

Transam is a bit of a boiler pimp, He likes them cheap and dirty :lol: Lets hope he wears rubber gloves when he installs them... Btw I would look in his profile at the ravenheat heat exchangers. Anyway atleast you will have spare parts when the first one goes tits up. You can rob it for bits...

Replacing the cylinder is easier... But If you did want to use a Phe then you not put it on the mains but put it on the cold feed to the cylinder pumping the heated water into the cylinder out let.

Interest theory Simond... but the installer does not have to fix anything. You can fit and forget all You want. I think You are getting confused with someone like me who installs and repairs. unlike other installers that leave their customers swinging in the wind after they have took there...