igital controllers allow you to select the exact temperature of the hot water at the tap within the controller temperature range. This has a number of benefits: Safety, especially if you have young children, the hot water can be pre-set to a child-safe level. No need to mix hot and cold water, this reduces the affect of temperature spiking when another tap in the building is turned on. You use your continuous flow unit more efficiently as less gas is required to heat water to 40 °C (typical shower temperature) than at 55 °C (default temperature without controllers). Allows diagnosis of problems (such as gas supply disruption) when the appliance is serviced by displaying 'error' codes that the service person can utlise.