Large CH radiator?

Stelrad do 300 high, otherwise flush the existing one and put it back on.

Have you thought of dropping it down a bit ? Is that possible or would it cause a problem

Three suggestions:

Check the nominal heat output of the present one, and also think whether it's sufficient / higher than required, then:

a) check whether you could fit a smaller one if it was a modern, finned type

b) if it's a single panel now, consider a double-panelled one (single or double-finned)

c) use two shorter ones, end to end. This may enable you to make big cost savings - B&Q sell 400mm high rads, for example, at £60 for a

Otherwise, prepare the nose for payment through it.

Newer rads have to obey the same laws of Physics as older ones, and only give out more heat if they are made to a different specification, such as having fins which the old one may not have.

If the problem is only one of silt, disconnect it and take it outside and give it a good blast out with a hose pipe.

If you really want to replace it but can't find one to suit, use two shorter ones, connected end to end.

And if that don't work, get a fan assisted one, which can do about 5 times the heat from a given size.

. . . as long as you don't mind the noise!