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I'm trying to find what to look for to get the correct spec. hot water cylinder to work with my Vaillant 418 boiler. Any recommendations for a conventional indirect open vented hot water cylinder that would be the best spec. heating coil wise to go with the Ecotec 418plus.? The existing tank is...

I have a Vaillant 418 on a Y plan. I'll try to explain problem briefly -- I can't get it to do both water and rads at the same time. With the 3 port valve in mid position (d70=1), the boiler only uses the D77 setting of 7KW and so it doesn't have a high enough KW output to do both rads and...