A Conventional Boiler
What is a Conventional Boiler (Heat-Only)?
A conventional boiler works alongside a hot water cylinder (for storing hot water) and a cold water storage tank (usually in the loft).
It heats water for your central heating system and stores hot water for later use.
These boilers are common in older properties with traditional heating systems and may be connected to gravity-fed systems.
Why Replace It with a Condensing Boiler?
- Energy Efficiency
- Older heat-only boilers often operate at 60–70% efficiency.
- A new A-rated condensing boiler operates at over 90% efficiency, meaning less wasted heat and lower bills.
- Lower Running Costs
- High efficiency = less fuel needed for the same heat output, saving you money every month.
- Space Saving
- A condensing boiler can often eliminate the need for a cold water tank and even the hot water cylinder (if switching to a combi), freeing up loft or airing cupboard space.
- Reduced Heat Loss
- Storing hot water in a cylinder means some heat is lost over time. Condensing boilers heat water on demand, cutting this waste.
- Eco Benefits
- Lower carbon emissions due to improved combustion and heat recovery technology.
- Future Proofing
- Meets modern energy efficiency standards and can integrate better with renewable heating systems.
ECO4 Scheme Eligibility
- You may qualify for a free or heavily subsidised boiler replacement if:
- Your existing conventional (heat-only) boiler is inefficient or faulty
- You are a homeowner
- Someone in the household receives qualifying benefits (or meets local authority flex eligibility)
- Your home’s EPC rating is D, E, F, or G
How It Works – Conventional Boiler to Condensing Boiler Replacement
- Free Eligibility Check
- We confirm you meet the ECO4 criteria (e.g. current system boiler in place, qualifying benefits, EPC rating D–G).
- Home Energy Survey
- Our engineer visits your home to assess your current heating system, check boiler condition, and confirm replacement suitability.
- Grant Approval
- We process your ECO4 application and arrange funding for your new A-rated condensing boiler.
- Boiler Replacement
- Your old system boiler is removed and replaced with a high-efficiency condensing boiler, optimised for your home’s heating needs.
- Quality Check & Handover
- We test your new boiler, ensure it’s running efficiently, and show you how to use it for maximum savings.
- Enjoy Lower Bills
- Benefit from improved efficiency, reduced energy costs, and a warmer, more reliable heating system — at little to no cost to you.
Why Upgrade to a Condensing Boiler with ECO4 Funding?
- The UK Government’s ECO4 scheme helps households cut their energy bills and carbon footprint by funding the replacement of outdated, inefficient boilers with modern, A-rated condensing boilers. If your home currently has a system boiler, this is the perfect opportunity to upgrade to a highly efficient condensing model at no cost. With fast installation, zero upfront charges, and long-term energy savings, switching to a condensing boiler is one of the smartest home heating improvements you can make today.
Your Conventional Boiler (Heat-Only) Funded from Start to Finish
- Under ECO4, eligible households can have their old boiler replaced with a brand-new A-rated combi boiler, fully installed by accredited engineers, without paying a penny.
- Full home energy assessment
- Removal and safe disposal of old boiler
- Professional installation of your new boiler
- Manufacturer warranty for peace of mind
- System testing and demonstration
- Advice on using your new heating system efficiently
Who Qualifies?
- Homeowner or Private Tenant with an existing system boiler
- Home must have an EPC rating of D, E, F, or G.
Benefits-Based Criteria
- Universal Credit
- Working Tax Credit
- Child Tax Credit
- Housing Benefit
- Pension Credit (Savings or Guarantee)
- Income-based JSA or ESA
- Income Support
Why Thousands of Homeowners Are Switching to ECO4 Combi Boilers
- Zero upfront cost – the grant covers the full supply and installation
- Lower heating bills – save up to 30% annually on energy costs
- Eco-friendly – reduces your home’s carbon footprint
- Space-saving – no tanks or cylinders, just one compact unit
- Instant hot water – no waiting for a tank to heat up
- Boosted property value – better EPC rating for your home
Cost Savings & Impact
- Typical energy bill savings around 22–30% per year
- Lower carbon footprint thanks to A-rated technology
- No upfront installation costs—fully government funded
Why Choose Us
We only install A-rated, energy-efficient combi boilers from leading UK brands, ensuring top performance and long-lasting reliability — all backed by manufacturer warranties.
Every home is different. Our team carries out a full property assessment to design the perfect heating solution for your needs, making sure you get the maximum benefit from your ECO4 grant.
Upgrading to an energy-efficient combi boiler reduces your carbon footprint, cuts energy waste, and supports the UK’s journey towards Net Zero emissions.
Common Questions
Most Popular Questions
A conventional boiler, also known as a heat-only or regular boiler, works with both a hot water cylinder and a cold water storage tank. It provides central heating and stored hot water, but it’s generally less efficient than modern condensing boilers.
It heats water and stores it in a hot water cylinder for later use, while also supplying your central heating. The cold water tank in the loft feeds the system, and hot water is delivered from the cylinder when needed.
Yes — if you meet the ECO4 eligibility criteria, we can replace your conventional boiler with a brand-new A-rated condensing boiler at no cost.
Condensing boilers are more efficient, take up less space, heat water faster, reduce heat loss from stored water, and lower your energy bills.
Yes — they can waste more energy, require more space due to extra tanks, lose heat through stored water, and may need more frequent maintenance.
A modern condensing boiler can last 15 years or more while maintaining high efficiency, whereas older conventional boilers often lose efficiency over time.
Yes — upgrading to a condensing boiler can improve your EPC rating by reducing heat loss and improving heating efficiency, making your home more energy-efficient overall.
Yes — condensing boilers can be integrated with certain renewable systems like solar thermal for hot water, providing even greater energy savings.
Most replacements are completed within 1–2 days, including removal of the old system and installation of the new condensing boiler.
Yes — good mains water pressure is important for optimal performance. During your survey, we’ll check your home’s water pressure before installation.
Yes — even if it’s functional, upgrading to a condensing boiler can save money, reduce maintenance issues, and improve heating performance.
We safely remove and dispose of your old boiler and any associated tanks in line with environmental regulations.
