Does the Passiv Smart Thermostat impact a heat pump's warranty?

The Passiv Smart Thermostat does not impact a heat pump warranty (or the warranty of the cylinder or other heating system components).

The Passiv Smart Thermostat uses standard interfaces to control a heat pump and the heating system (Modbus and relay). This is in common with all heating controllers and Building Energy Management Systems and is accepted as a means of third-party control by heat pump manufacturers.