How do I adjust the temperature when the water is too hot?

If you find that the temperature of your hot water is too high for your comfort, it is relatively simple to adjust it, though the process may vary depending on the type of boiler you have.

For combi boilers, adjusting the water temperature is quick and straightforward. Simply locate the digital control panel or the temperature dial on the front of your boiler. From there, you can easily make adjustments to the hot water temperature without affecting the heating settings. The change will take effect immediately.

For conventional boilers (also referred to as heat-only or regular) or system boilers, the process is slightly more involved, as the temperature is often controlled through a thermostat located on your hot water storage cylinder. To make the adjustment, you’ll need to find the thermostat and temperature control on the cylinder, and then adjust it accordingly. However, it’s important to note that changes to the temperature won’t take effect immediately, as the cylinder is typically insulated to retain heat and therefore may take several hours to cool down.

It is not advisable to lower the temperature below 60°C (140°F), as this is the minimum temperature required to effectively kill most bacteria, such as Legionella, that may be present in stored hot water. Reducing the temperature too much could increase the risk of bacterial growth and compromise your health and safety.

On the other hand, if you wish to increase the water temperature, keep in mind that temperatures above 65°C (149°F) pose an increased risk of scalding. It’s generally recommended to find a balance between comfort and safety, ensuring that your hot water is sufficiently hot for everyday use while minimising any risk of injury.