"Julian" wrote in message

Will a TRV always stay open at it's maximum setting,
or will it close when the room gets very hot?

I don't really know, but if you set fire to the room you could go in
afterwards and check and report back to us all!

Julian.

Julian,

Many thanks - excellent advice - I'll do that right away..
Of course if anything goes wrong... I'll say you told me..:-)

It was a seriuos question. When set to zero they stay shut.
Are they designed to stay open at their max setting?

Roy