Quote:
Originally Posted by AbyssUnderground
Yes it is, as they are numbered and has the defrost only icon lower on the dial. In all likelihood they're just old and the springs are worn.
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Well worth replacing so that they do their job correctly. They don't least forever. New electrically-operated ones are better but more expensive.
Our lad had the misguided impression that turning them up to a higher number caused the room to heat faster, when in fact they only control the minimum/maximum temperature of the room.
Setting the boiler temperature for CH can have surprising results: too high and the rads become a danger for youngsters and the old; too low and they never manage to pump out enough heat to warm the house. Plus at low temps the pump runs far too long wasting electricity.
Also, too hot can cause the boiler to spurt out over-expanded water via the over-pressure valve, or in systems with a header tank in the attic, the attic can fill with steam!