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Thermostatic or Manual Valves?

A thermostatic radiator valve measures the room temperature and adjusts the flow accordingly. It does this by means of a sensor in the centre of the handle.

As the room temperature rises expansion causes a rod to push down on the valve mechanism restricting the inlet flow of hot water.

The desired temperature is set by turning the handle.

At the outlet (return) end of the radiator is attached the lockshield valve.

This is adjusted by the plumber to balance flow rates through the system, ensuring all radiators get an adequate share of the available hot water.

Thermostatic radiator valves are recommended as energy saving.

It is Castrads' view that they are, if the temperature is set and maintained.

In practice people may think it's a little chilly then turn the valve full on. Left fully open they will save no energy at all.

Manual radiator valves have no thermostatic control.

The maximum flow of hot water out of the radiator is controlled by adjusting the lockshield valve on the radiator outlet as for thermostatic valves.

The inlet valve with manual handle is used to turn the radiator on and off.