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I have a older vented fully pumped system with a trusty old Glow-worm Spacesaver 75 boiler, new Drayton LP722 2 channel programmer, new Grundfos pump, 2 x 2 port Sunvic MOMO valves, and Honeywell thermostats for the CH and the HW cylinder. Been working fine for years, with CH and HW working...