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Hi Tony, Thanks for your feedback. The Viessmann tech told me that the B circuit has its own heating curve ont he boiler so can be set to the desired temp of say 40 degrees. A sensor on the mixer valve reports this back to the boiler and then the boiler adjusts the water temp accordingly...

Ok here’s the situation, I am a home owner (not an installer) and I am looking for some clear advice for a heating system I'm looking to have put in over the next 2 weeks. The house is a semi with 4 bed 1 bath, and 2 en-suites. We are considering a Viessmann 222-F WTC, and I have spoken with...