On 19/03/2016 07:28, harry wrote:
Depending on your system design it may be a "heat sink" & therefore not to be fiddled with.
Enables the boiler thermostat to run correctly.

http://www.traderadiators.com/blog/W...d-you-have-one

I am well aware of these issues. It just about could be in the holiday
let, but it isn't in the other location.

--
Rod