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The selected settings will be reached and maintained after a 30 second period. Thermostatic control (optional) 1) A thermostatic regulation valve with a remote sensing bulb (not supplied) can be positioned in the supply water pipe-work to regulate the heat output. 2) An electrical 3-Port Solenoid Valve can also be connected into the system. Please contact your service agent using the contact details for more details. Door switch control (Water heated & Ambient models) By including a door switch