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Thanks for the useful replies. (y) So shouldn't be a plumbing change apart from in the garage. How about wiring? I think in the Viessmann case it needs a low voltage stat, so would need a Viessmann Cylinder Demand Box. Is it probable that can be fitted at the garage end, using the existing...

Hey. I’m looking to replace my 18yr old and occasionally temperamental Worcester system boiler with something efficient and reliable, possibly a Viessmann 100-W system boiler. With a smart thermostat that would ideally give modulation control (pref using OpenTherm). I plan to keep the Megaflo...