Replace Your Old Storage Tank With A New Combi Boiler
Replace your old storage tank with a high-efficiency combi boiler under the ECO4 scheme. Discover eligibility, benefits, and how to apply for a free boiler.
Still using an outdated storage tank system? It’s time to modernize your heating with a compact, energy-efficient combi boiler. Thanks to the UK government’s ECO4 scheme, eligible households can replace their old heating setup at no cost. This guide explains how you can remove your loft water tank, install a new combi boiler for free, and enjoy better comfort, savings, and better home efficiency all through a free boiler grant.
What Is A Storage Tank And Why Replace It?
A storage water tank is a large container usually installed in the attic to store cold water for traditional gravity-fed heating systems. These setups:
- Rely on gravity to supply water to radiators and taps
- Require bulky tanks like a 100-gallon water tank or plastic storage tank
- Are prone to leaks, freezing, and inefficiency
They were once common, especially in older homes where mains pressure wasn’t strong enough to feed upstairs plumbing. But today, these systems are seen as inefficient and outdated, especially with modern combi boilers offering a direct connection to the mains water supply. This allows for consistent pressure, better water quality, and less maintenance.
With modern heating solutions, old storage tanks are outdated. Replacing them with a combi boiler frees up space, reduces maintenance, and enhances your home’s energy performance.
What Is A Combi Boiler And How Does It Work?
A combi boiler (short for combination boiler) is a single, compact unit that provides both central heating and hot water on demand, directly from the mains no tanks needed. Key benefits of installing a combi boiler:
- No water storage tanks required
- Instant hot water at taps and showers
- Over 90% energy efficiency
- Ideal for small-to-medium homes
- Easy to control with smart thermostats
Combi boilers are especially ideal for urban and suburban homes where loft and airing cupboard space is limited. By drawing water directly from the mains, these boilers deliver hot water at higher pressure and more reliability, meaning better showers, faster hot taps, and greater overall comfort.
A combi boiler eliminates the need for any water holding tank or storage tank, helping you improve your EPC (Energy Performance Certificate) score and cut energy bills.
Why Replace Old Storage Tank With A Combi Boiler?
Replacing your old storage tank with a combi boiler is one of the most practical and energy-efficient upgrades you can make for your home. Here’s why it makes so much sense in 2025:
1. Free Up Loft Space: Remove big water tanks, plastic tanks, or 100-gallon water tanks. Use attic space for insulation or storage, no risk of leaks or frozen pipes.
2. Improve Energy Efficiency: Combi boilers exceed 90% efficiency, higher EPC rating boosts property value, lower carbon emissions, enhanced heat control reduces waste.
3. Better Heating Performance: Hot water available instantly, no wait time for reheating, strong water pressure across taps and showers, consistent heating across all rooms.
4. Lower Heating Bills: Reduced energy usage = reduced bills. Combine with ECO4 insulation for extra savings, smart thermostats reduce unnecessary usage.
What Is the ECO4 Scheme?
The ECO4 Scheme (Energy Company Obligation Phase 4) is a UK government program designed to:
- Help low-income and fuel-poor households
- Reduce carbon emissions
- Upgrade inefficient heating systems
- Without paying any upfront costs
Introduced as the latest phase of the long-running ECO scheme, ECO4 places greater focus on sustainable heating and whole-house improvements. It offers free upgrades to qualifying homes including:
- Boiler replacements
- Wall, loft, and floor insulation
- First-time central heating
- Air source heat pump
- Smart controls
Who Qualifies for Free Boiler Grant?
You may qualify for the ECO4 free boiler scheme if:
- You own or privately rent your home.
- Your home has a low EPC rating (E, F, or G).
- You receive means-tested benefits like:
- Universal Credit
- Pension Credit
- Income Support
- Tax Credits
- Child Tax Credit
Many homeowners are unaware that even if they’re not receiving benefits, they may still qualify under LA Flex rules based on income, health conditions, or age. It’s always worth checking with an ECO4 provider like Cozyfy.
The ECO4 Application Process (Step-by-Step)
- Check Eligibility: Use Cozyfy’s online tool to check your eligibility in just 60 seconds.
- Book a Free Home Survey: Review your current heating setup & insulation.
- Approval & Grant Confirmation: We handle the paperwork for you to make the installation process easy and hassle free.
- Installation by Gas Safe Engineers: The installation usually completed within 1–2 days.
- Final Inspection & Handover: Receive full documentation for compliance and peace of mind.
Why Choose Cozyfy For Free Boiler Installation?
Cozyfy manage the entire ECO4 application process. No paperwork or hassle for you. Gas Safe registered engineers only. Modern, quiet combi boilers with smart controls will be installed. Minimal disruption during installation. Free expert advice on how to qualify and how to get.
Cozyfy ensures a seamless experience from your first enquiry to a warm, efficient home. We provide personalized recommendations based on your property’s needs, helping you maximize ECO4 benefits.
Cost Of A New Combi Boiler
A combi boiler typically costs between £2,000–£3,500, including installation. But with the free boiler grant, you could pay nothing at all.
This not only saves thousands in upfront cost but also provides long-term financial relief through reduced bills and better efficiency. Many homeowners report savings of £400–£500 annually post-upgrade.
Final Thoughts
Say goodbye to your old storage tank and hello to modern combi boiler. With the ECO4 scheme, eligible UK homeowners can enjoy free boiler installation, better energy efficiency, and real savings.
Cozyfy is here to guide you through every step from eligibility to install. Don’t wait replace your old storage tank with a combi boiler today and enjoy a warmer, smarter home.
Frequently Asked Question!
A combi boiler heats water and provides central heating in one compact unit no storage tanks needed.
Yes if you meet the eligibility criteria, the boiler, installation, and upgrades are 100% free for eligible households.
You won’t need it anymore. The combi system works directly from the mains. You should check your eligibility and apply for a free boiler installation as soon as possible.
Yes. Landlords with eligible tenants or fuel-poor properties can qualify for free boiler replacement and get a brand new boiler installed for free.
Usually the installation process takes between 1–2 days with minimal disruption, it depends on several factors like boiler type, property size, etc.
More space, less maintenance, reduced heat loss, and no risk of leaks or frozen pipes.
LA Flex allows local councils to approve funding for residents who don’t meet strict benefit-based criteria but still need support due to income, health, or property conditions.
