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Ok, ignoring the dodgy maths: I have a 120,000BTU boiler and a 210L vented indirect cylinder 15m away. Should I use 28mm for the primary heating coil given the size of the boiler? If so, I'll probably have to include a restrictor to balance the dhw with the CH. Could someone please...

I've just bought a BS1566 1500 x 450mm (210L) indirect vented cylinder to connect to the existing central heating system, which uses a pumped 35kw gas boiler. I'm intending to use two 2 port zone valves for independent control of CH and HW. The cylinder will be positioned 15m from the...