Andy Hall wrote:

Cheap TRVs are a false economy. Better choices are Invensys TRV4,
Pegler Terrier or Danfoss.

Most of the cheapies I have found tend to give a high pitched squeeling
on the last bit of the close. in-audible to the slightly older
generation, but a PITA as it can last several minutes.

The ones on our very old and being replaced radiators are "Myson" look
as old as the rads themselves, but definately in excess of 10 years, and
worked exceptionally when the old system was in operation.


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