Liquid expansion type thermostat with a 6mm 0 probe in a removable stainless steel thermowell, with an IP 54 cove1;. Differential 2,5% of full scale.
Double-pole double-throw contacts, 10A at 230V.
To install these thermostats you need only a 1/2" BSP threaded hole in the recipient tank. The sealable cover is fixed to the thermowell by a retaining screw, and the bulb can easily be removed.