I've read lots of useful information on this group about hot water UFH,
but has anyone any thoughts about how to control it? This is for a GF
extension that is going to be the kitchen. Concrete floor with the
usual insulation underneath. Combi boiler driving the existing central
heating.

I'm wondering how to enable the UFH to be kept on (perhaps timed, or
perhaps just thermostat) independently of the main heating
thermostat/controller.

Thanks