I am dreading having my combi replaced when it comes to the end of its life (Worcester Heatslave 1988 build).
Why?
The system uses the twin entry Twinfast valves (two pipes into a single valve fitting with coaxial flow and return) on each radiator. Under new regulations I expect I will have to convert the plumbing so that I can have Thermostatic valves fitted.
I don't need thermostatic valves. I have a very good electronic programmable thermostat - I turn off the upstairs radiators as soon as the weather gets a bit mild. I have my downstairs doors open so the house is effectively controlled by the room thermostat.
I think thermostatic valves are sluggish and hit or miss. They are vulnerable to physical damage. They are mis-used as on-off valves.
Do I really have to have them fitted - is there a way around it?