On 17/05/2017 14:29, Andy Burns wrote:
Adrian Brentnall wrote:

As per the subject - does such a thing exist?

The heatmiser prog stats allow setting a switching differential
from 0.5 to 3 degrees, in 0.5 degree steps.

Ah thanks, Andy.
You mean the PRT-B - on the right-hand side of this page?
https://www.heatmiser.com/en/battery-thermostat-series/