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Thank you for responses so far. Tony, I think my original post is getting a bit confused - I am trying to use WC on the UFH but with the UFH separately zoned from the rads (I completely agree with what you are saying about response/warm up times of rads versus UFH). The Viessmann...

Sadly, the UFH valve/pump is already installed (but I will take it down and save for another job/ebay if the sub-mounted mixer kit is not much more expensive than buying the Viessmann actuator and brass bodied mixer (and solder kit) separately)... I would have thought that in the event of...

Hello, I'm hoping that somebody may have experience of how the following works in practice and I'd be grateful for any input. To set the scene, the project is a 4 bed, 2 bathroom Victorian mid-terrace insulated to current Building Regs. We're looking to use a Viessmann 200-W 19KW system...