Your boiler’s thermostat controls how hot the water gets before it’s pumped to your radiators – this is called the flow temperature. As this water travels through your radiators, it cools down before returning to the boiler at what’s called the return temperature.
If your flow temperature is set higher than needed, lowering it could save you money. This is because a lower flow temperature means a lower return temperature, which helps your boiler work more efficiently.
However, be careful not to set it too low. If the flow temperature isn’t high enough, your radiators won’t get hot enough to warm your home properly, especially during cold weather. You’ll need to find the right balance between efficiency and keeping your home warm enough.
If you have a regular boiler with a separate hot water cylinder, there’s only one control for both your radiators and hot water. You need to make sure the temperature is set high enough so that you have hot water. This should be no lower than 65°C so that it can heat your cylinder to 60 °C. This is very important to prevent the growth of harmful bacteria.
For more information, read our blog on how to turn down your boiler flow temperature.
