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My 28CDI has just started whining when the CH is running. It was serviced 2 weeks ago and a few days prior to that the I disturbed the Relief Valve when repositioning the overflow (required for the service). Anyway after blowing off the valve half a dozen times, the valve eventually stopped...

I'm looking to add a rf thermostat onto a gravity CH system. There is an existing (and very old) Danfoss Randall 3060 which is working ok. Ideally the thermostat should be simple to use (its for my mother and she is 75 and technology terrified) and reliable. Are there any to avoid? Would I be...