Your hot water tank

The temperature in your hot water tank should be 55°C. Higher temperatures are simply a waste of energy and cost both you and the environment. If you reduce the temperature from around 60°C to around 55°C, you can save 2-3 per cent on your annual heating bill. However, you should ensure the temperature does not fall below this, otherwise there is a risk that legionella bacteria could live in your hot water.