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I fit a lot of unvented systems and find if your going for Worcester best to fit there twin coil cylinder, if you are not zoning the heating you can use there internal diverter
normally if it's no zones I fit
30cdi system
int diverter
worcester twin coil cylinder
worcester system filter
and dt10rf optimiser or they do a weather comp control
if you stick to all Worcester products there all covered within the guarantee
5year plus 1year for cylinder plus 1year for filter so seven year guarantee in total on all there products.
if you are zoning then Honeywell zone valves draton +3rf stats
And parts are crazy price
We recommend City Plumbing Supplies, BES, and Plumbing Superstore for all plumbing supplies.