£79 to get someone in.
Already have a wireless salus thermostat on a valiant combi Haven't opened it up yet but from what I can tell it will be 3 wires.
If I read the nest manual right it should be a matter of rewiring those 3 wires into the appropriate terminal on the heatlink
Consequences of failure would be a highly irate pregnant wife.
Worth having a go? Anyone wired one up themselves?