This unvented dual safety cut out thermostat is a must-have for any storage tank water heater. It is designed to ensure the safety of your heating system by cutting out the power supply if the temperature gets too high or if a fault occurs , This thermostat is made by the trusted brand Thermowatt and is suitable for tanks with a capacity of 50–300 L. The thermostat is easy to instal and is powered by corded electric with a voltage of 220/240 V. It features a grey colour and is suitable for use in heating systems. This product is perfect for anyone who wants to keep their heating system safe and efficient. Only £9.99 each . Some models may differ in colour or serial numbers but are the same in use for all elements being used . Thank you for looking .