How To Replace Your Old System Boiler For Free? 2025 Guide
Upgrade your old system boiler to a modern boiler model. Discover how you qualify for a free boiler replacement under ECO4 scheme, and how to apply.
If your system boiler is outdated, inefficient, or frequently breaking down, now is the time to replace it. A new boiler offers improved energy performance, lower heating costs, and better comfort. And thanks to the free boiler scheme, many UK homeowners can now upgrade their old system boiler with new, A-rated boiler model at zero cost.
This guide explains everything: what a system boiler is, signs it needs replacement, the best new boiler options, how to apply for a free boiler grant, and how to cut energy bills in 2025.
What Is A System Boiler?
A system boiler heats your central heating system and hot water stored in a cylinder, without needing a cold water tank in the loft. It’s ideal for:
- Homes with multiple bathrooms.
- Medium-to-large households needing high hot water flow.
- Properties that already have a hot water storage cylinder.
Signs For Boiler Replacement
You may need a new boiler if:
- You hear unusual noises (banging, gurgling, or whistling).
- You experience inconsistent hot water or heating.
- Your boiler is over 15–20 years old.
- Your energy bills are rising.
- You see a flickering or yellow pilot light.
- You have a low EPC rating (D, E, F, or G).
Benefits Of Replacing An Old System Boiler
Upgrading your old system boiler offers significant advantages in energy efficiency, cost savings, and comfort. Here are some major benefits of replacing old boiler with newer:
- Energy Efficiency: New condensing boilers are over 90% efficient than older models.
- Faster Hot Water: Consistent flow rate, even with multiple users, it means instant hot water without any storage tank.
- Space-Saving Designs: Wall-mounted options free up space and no need for a separate water tank to store hot water.
- Smart Home Ready: Compatible with thermostats and energy tracking apps, so you can easily control it with your smart phone.
- Reduced Carbon Emissions: Help the UK meet net-zero goals and make UK’s environment better and sustainable for all.
- Low Maintenance: Fewer breakdowns and easier servicing and no more expenses for boiler repairing.
- Improved EPC: A new boiler can increase your home’s energy efficiency and it can boost EPC rating of your home.
Best Boiler Options Under ECO4 Scheme
- New System Boiler: Perfect for homes that already have a hot water cylinder. Delivers high-pressure water to multiple taps simultaneously.
- Combi Boiler: Ideal for smaller homes or if you want to eliminate the hot water tank. Provides hot water on demand.
- Condensing Boiler: Whether system or combi, these use waste heat from flue gases to improve efficiency and reduce emissions.
A typical system boiler installation costs £2,000–£4,000, depending on brand and complexity. But through the ECO4 Scheme, you may qualify for a free boiler replacement.
What Is ECO4 Scheme?
The ECO4 Scheme is a government initiative offering fully-funded boiler replacement to eligible UK households. It’s designed to:
- Improve energy efficiency
- Help reduce heating bills
- Replace old, broken, or inefficient boilers
Who Qualifies For A New Boiler Grant?
You may be eligible if you:
- Own your home or are a private landlord
- Live in a property with an EPC rating of D–G
- Have a boiler that is non-condensing or over 15 years old
- Receive one or more of the following:
- Universal Credit
- Pension Credit
- Income Support
- Housing Benefit
- Child/Working Tax Credit
- Income-related ESA or JSA
- Child Benefit (with income limit)
How To Apply For A Free Boiler Grant?
- Check Eligibility: Use Cozyfy’s online form and check your eligibility in just 60 seconds.
- Book a Free Survey: A certified assessor checks your current setup and process your application file for further work.
- Get Approval: If you are eligible, you’ll be approved for ECO4 funding and a experienced installer’s team will contact you soon.
- Installation: A new boiler is fitted by Cozyfy’s Gas Safe registered engineers to make the installation work smooth and hassle free for you.
- Enjoy: Lower energy bills and a more comfortable home for you and your family.
Choosing The Best Boiler For Your Home
Top UK boiler brands to consider include:
- Worcester Bosch: Trusted for reliability and warranty.
- Vaillant: Known for energy efficiency and quiet operation.
- Ideal Heating: Popular for affordability and smart tech.
- Baxi: British-made and easy to service.
Cozyfy helps you compare and install the best model based on your home size, hot water demand, and grant eligibility. Just reach to us and start a hassle free boiler installation today.
Final Thoughts
Replacing your old system boiler is no longer just an upgrade, it’s a smart investment in comfort, savings, and sustainability. With government grants like ECO4, you can get a brand-new energy-efficient boiler for free, installed by trusted experts like Cozyfy. Save on heating bills, Improve your EPC rating, Future-proof your home’s heating.
Don’t wait! check your eligibility today and apply online to start your free boiler upgrade journey.
Frequently Asked Question!
A system boiler uses a hot water cylinder. A combi boiler provides instant hot water without storage.
Without funding, £2,000–£4,000. With ECO4 scheme you can get a new boiler for absolutely free.
Yes, Cozyfy helps you to apply and arrange installation through ECO4 scheme without any hassle.
Top brands include Worcester Bosch, Vaillant, Ideal, and Baxi are consider best for UK homes depends on home size and hot water demand.
Yes, in most cases, especially if the tenant receives qualifying benefits landlord can apply for a boiler grant through Cozyfy.
Visit cozyfy.co.uk and fill out the online application form and find out your eligibility in just 60 seconds. If eligible, Cozyfy guide you for further process.
