Switch2 HIU - Heat Interface Unit Parts Switch2 HIU - Heat Meter T230 Mbus Ultraheat Replacement Switch2 HIU - Thermostat Set Point & Valve Replacement Switch2 HIU PR Valve Assembly 10 Bar Yellow Replacement Switch2 HIU PR Valve Assembly 3 Bar Red Replacement Switch2 DHW Samson Valve Replacement Switch2 Heating Zone Valve Head & Body Replacement Like Tweet +1 Pin it