What Is Eco Mode on My Boiler?
Most modern combi boilers come with an ‘Eco Mode’ button — but what does it actually do? And is it worth using?
In short, Eco Mode helps reduce your energy usage and save money by adjusting how your boiler heats water. Here’s how it works, when to use it, and whether it’s right for your home.
What Does Eco Mode Do?
When Eco Mode is activated, your boiler no longer keeps hot water pre-heated and stored. Instead, it only fires up when there’s a demand — like when you turn on a hot tap.
That means the boiler isn’t burning gas constantly to keep water warm “just in case”. It only heats water when you actually need it.
Benefits of Using Eco Mode
- Lower gas usage: No standby heating means less energy consumption.
- Reduced bills: Great for homes looking to cut running costs.
- Better efficiency: Ideal for households with low or irregular hot water use.
What’s the Catch?
When Eco Mode is turned on, it can take a few seconds longer for hot water to reach your tap — especially first thing in the morning or after periods of no use. That’s because the water is being heated from cold rather than already being kept warm in the system.
When Should I Use Eco Mode?
Eco Mode works best if:
- You don’t use hot water constantly throughout the day
- You’re trying to reduce your gas bills
- You’re happy to wait an extra few seconds for hot water to arrive
If you have small children, an elderly person in the home, or specific routines where instant hot water is essential, you might prefer to keep Eco Mode off — especially in winter.
Can Eco Mode Affect Heating?
No — Eco Mode only changes how your boiler handles hot water. Your central heating will still run as normal when scheduled or triggered by the room thermostat.
Should I Leave Eco Mode On All the Time?
There’s no harm in keeping Eco Mode on permanently if it suits your lifestyle. It reduces wear on your boiler’s hot water components and helps with long-term energy savings.
You can always switch it off temporarily if you're hosting guests or expect heavier hot water use.
Want to Save More on Heating?
Eco Mode is a great start — but smart thermostats, TRVs, and regular boiler servicing can all help boost efficiency even further.
📞 Call us: 01383 660098
🌐 More info: Boiler Servicing & Smart Upgrades
We help homes across Dunfermline and Fife heat smarter — and save more.