Robertshaw / Invensys are phasing out their range of EWT (grey body) Thermostats and replacing them with the NEW ST Thermostats (Black body).

Note the NEW ST Thermostats have changed Terminal Connections and are wired slightly different to the EWT type units.

The NEW ST Thermostats have a different look, they are black in color, slightly smaller and responds quicker to temperature changes. ST Thermostats fit into the same mounting as the older EWT type.

Download "ST" Hot Water Thermostats