Lowering your combi boiler flow temperature to 60°C could save you up to £70 a year
With everyone thinking more about energy at the moment, we’ve put together some helpful tips to help save energy around the home. We teamed up with Nesta to show you that adjusting your combi boiler flow temperature from 80°C to 60°C could save you up to £65 a year.
Reducing your boiler flow temperature from 80°C to 60°C isn’t about making your house cooler; it’s about lowering the temperature of the water your boiler sends to the radiators in your home.
This makes the boiler work more efficiently, meaning you use less energy to warm your home to the same temperature.
Who is this tip for?
This advice is for people with a combi boiler, who feel confident to make small adjustments to their boiler controls. We’ll step you through how to do this below, but if you don’t feel confident making these adjustments, you may want to consult the manual for your boiler or speak to a professional heating engineer/technician.
Before you start
Consider taking photos of the settings of your boiler controls to help you reset them if needed.
Are there vulnerable people in the household?
Please be aware of any people with underlying health conditions or those who may be vulnerable to cooler temperatures for other reasons. Reducing the flow temperature of your boiler may mean rooms take a bit longer to reach the desired temperature. You could consider reducing the boiler flow temperature and seeing what impact that has.
Check if you have a combi boiler
This energy saving tip works for gas-powered combi boilers only. If you heat your home using another method then this guidance cannot currently be used. If you have a hot water tank, this means you have a system boiler, not a combi boiler, so this advice will not apply.
Look for the radiator symbol
Ensure the dial has a radiator symbol next to it, this represents the heating system. It will normally look something like this...
If this symbol is next to a button, press the button and this should select the boiler flow temperature.
Adjust the controls
This tip doesn’t involve adjusting your thermostat or your smart meter in-home display, it requires you to adjust the controls on your boiler itself.
Open the front panel on your boiler.
Ignore any timer-based controls you might have on your boiler.
You may see a single dial or multiple dial control system, something like this…
Change the temperature to 60°C
If you have a digital display showing the flow rate, you can adjust the controls to approximately 60°C.
Controls with a digital display will have a screen with a number to show you the temperature which is set. In most cases, setting the control to around the 12 o'clock position will bring it to 60°C.
If your flow temperature is already set to below 60°C, this is already likely to be the ideal boiler flow temperature for you, so we recommend not adjusting the control.
Your digital display may instantly update to the new flow temperature as you make the change, or update the next time the heating comes on.
If you don’t have a digital display and there is no way of knowing the exact flow temperature, you can try adjusting the controls to around the 12 o’clock position (see image below).
If your boiler controls have buttons, not dials
You will normally need to press the button to control the flow temperature. You will then have to adjust the flow temperature by using the plus and minus buttons to reach the target temperature of 60°C.
Once the selected temperature is reached, you may have to press the OK or radiator button again to confirm your selection.
Is there help and advice for those worried about the rising costs of energy?
Yes, if you are worried about the rising cost of energy and being able to pay your energy bills, we have information on the support and help which may be available.
Our energy saving tips are courtesy of Nesta and Energy Saving Trust
It’s important that you use the energy you need to keep warm, safe and healthy at home. Please visit our trusted partners pages for more information on how to safely implement these tips within your home - Nesta and Energy Saving Trust
Eligibility may vary. Consumer action required. Maximum savings based on reductions from 8-minute shower, original boiler flow temperature of 80 degrees, and 22-degree thermostat, savings based on a three-bedroom, semi-detached, combi boiler gas-heated home in Great Britain, paying 6.9p/kWh for gas and 27.4p/kWh for electricity and correct as of October 2023. Figures on smart meter display are for illustrative purposes only.