If the total load of your underfloor heating circuit exceeds 16A, and you want to control it from one thermostat, then you must install a suitably rated Contactor snubber.
SKU:
P00002647
£107.44
£128.93
£66.06
£85.92
£77.48
£39.58
£12.79
£123.59
£97.84
£117.65
£156.67
£78.61