Under floor heating - spare part?

not sure hat an 'actuator' is or does.

If you mean a motorised valve, they are ubiquitous. many people make them.

The Natural Philosopher ( snipped-for-privacy@invalid.invalid) wibbled on Monday 10 January

Might be a thermal wax actuator - like a TRV but the head is a cylinder filled with wax + electric heating coil which operates a plunger as the wax expands.

I've seen UFH manifolds that have an array of these with the various takeoffs - and single units too. York Uni back in the 80's had full TRV head swaps with these so rads in the college could be on a touch timer (easily defeated by the students!).

To the OP:

Do you think the residue is wax or leaking dried water?

If the former, you should be able to swap the head without touching the plumbing. If the latter, you need a new valve base or a full new unit - in which case any make should be fine, provided the control voltage is the same

- many are mains, but 24V and others do exist.

Cheers

Tim

You've got me wondering now why I am calling it an actuator! Must have seen it in the docs somewhere....

I appreciate that there will be many suppliers of motorised valves, but there is a possibility that they won't fit this setup.

Cheers!

Matt

That looks a bit like my wax filled heads .. mine are polyplumb tho. Screw onto the manifold to shut off various circuits.

Should be a simple job to replace, if you can find the right part.

larkim ( snipped-for-privacy@gmail.com) wibbled on Monday 10 January 2011 11:56:

It is.

Looks like the wax had leaked out. New head if you can match it would be easiest otherwise new unit, which as I mentioned, does not have to be the same make as long as you can get it fitted.