Boiler REplacements

Gas Boiler Replacements & Energy Efficiency

At The Eco Advisory Bureau, we’re dedicated to helping homeowners across the UK upgrade to modern, energy-efficient heating systems that save money, cut carbon, and enhance home comfort. Whether you’re replacing an older boiler, removing a back boiler, or converting your system entirely, we provide expert guidance, high-quality installations, and access to government funding wherever possible.

Replacing Your Combination Boiler

If your home already has a combination (combi) boiler, upgrading to a modern, high-efficiency A-rated model is one of the simplest ways to improve your energy efficiency and lower your heating costs.

Our process:

Assessment – We evaluate your existing boiler, heating layout, and energy usage.
Installation – A new, energy-efficient boiler is installed, often in the same position to reduce disruption.
Testing & Commissioning – We ensure your new system performs safely, efficiently, and in line with current regulations.

A high-efficiency boiler can operate at up to 94% efficiency, helping you save £300–£500 per year on bills while significantly reducing carbon emissions.

Replacing a System Boiler with a Combination Boiler

If your property currently uses a system boiler with a separate hot water cylinder, upgrading to a modern combi boiler offers several key advantages.

Our process includes:

Removing the hot water cylinder, freeing up valuable space in your airing cupboard or loft.
Installing a compact, high-efficiency combi boiler, which heats water directly from the mains.
Reconfiguring pipework to optimise flow and performance.

Benefits of Converting to a Combination Boiler

✅ Instant Hot Water – No more waiting for a tank to heat up; enjoy hot water on demand.
✅ Space Saving – Removing the hot water cylinder creates additional storage space.
✅ Lower Bills – Use less gas to heat your home and water.
✅ Carbon Reduction – Cut your household emissions by up to 1.5 tonnes per year.
✅ Increased Home Value – Improve your property’s EPC rating and market appeal.

Back Boiler Removal and Replacement

If your home still uses an older back boiler, upgrading to a modern combination boiler is one of the most impactful energy improvements you can make.

A back boiler typically installed behind a fireplace is outdated, inefficient, and often costly to maintain. Modern heating standards recommend replacing them entirely with a more efficient, wall-mounted combi boiler.

Our process for back boiler replacement includes:

Safe Removal – We fully decommission and remove your old back boiler in accordance with Gas Safe regulations.
Re-Siting the New Boiler – Your new combi boiler is usually installed in a more accessible location, such as the kitchen or utility room, freeing your fireplace for alternative use.
System Upgrade – We replace old pipework, fit modern controls, and flush the system for peak performance.
Testing & Certification – The installation is safety-checked, fully commissioned, and certified for compliance.

Benefits of Removing a Back Boiler

✅ Massive Efficiency Gains – Older back boilers typically run at around 60 – 70% efficiency, compared to over 90% for new condensing combi boilers.
✅ Lower Running Costs – A new boiler can reduce your annual gas usage and save £400 – £600 per year.
✅ Instant Hot Water – Eliminate the need for a separate tank and enjoy hot water on demand.
✅ Freed Fireplace Space – Removing the old back boiler gives you the opportunity to install a modern fire or reclaim valuable living room space.
✅ Quieter, Safer Operation – Modern boilers are compact, quiet, and equipped with advanced safety and diagnostic systems.
✅ Environmental Benefits – Reduce your carbon emissions and help move toward a lower-carbon home.
✅ Added Value – A modern boiler improves your property’s energy rating and resale appeal.

ECO4 Boiler Replacement Grants

You may be eligible for a free or heavily subsidised boiler replacement under the ECO4 Scheme, a government-funded initiative designed to improve home energy efficiency across the UK.

You could qualify if:

You own or privately rent your home (with landlord consent).
Your property has a low EPC rating (E, F or G).
You or someone in your household receives eligible benefits, such as:
- Universal Credit
- Income Support
- Child Tax Credit
- Pension Credit
- Housing Benefit
Or, your household income is below £31,000 per year.

The Eco Advisory Bureau handles the full process, from initial eligibility checks and surveys to installation and certification, making your upgrade smooth and stress-free.

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Installation Costs (for Non-Grant Customers)

If you don’t qualify for government funding, we offer competitive installation packages with transparent pricing and no hidden extras:

Home TypeTypical Installation Cost (from)

1 – 2 Bed Flat - £1,800 – £2,400

2 – 3 Bed House - £2,200 – £2,800

4+ Bed Home - £2,800 – £3,500

Back Boiler Conversion - £2,900 – £3,800

All installations come with:

Full warranty and aftercare support
Professional commissioning
System balancing and efficiency checks

Trusted, Gas Safe Accredited Installers

Every installation carried out through The Eco Advisory Bureau is handled by Gas Safe registered engineers who have been vigorously vetted by our internal compliance team.

We only partner with installers who:

Hold current Gas Safe certification.
Have proven experience in high-efficiency and low-carbon heating systems.
Adhere to The Eco Advisory Bureau’s strict code of workmanship and customer care.
Undergo regular quality and compliance audits.

This ensures every installation is completed safely, legally, and to the highest standard of workmanship; giving you confidence and peace of mind that your new boiler will perform reliably for years to come.

Smart Thermostats & TRVs

We also offer smart thermostats and thermostatic radiator valves (TRVs) to help you make the most of your new heating system:

Smart Thermostats (from £150 installed) – Control your heating remotely, set energy-saving schedules, and monitor usage via your smartphone.
TRVs (from £25 per radiator) – Fine-tune room temperatures for optimal comfort and efficiency.

Together, these technologies can improve comfort and deliver an extra 10–15% reduction in heating costs.

Whole-House Energy Assessment

Before every installation, The Eco Advisory Bureau conducts a Whole-House Energy Assessment. This comprehensive review considers:

Your insulation levels
Heating system performance
Ventilation and controls
Overall energy efficiency

From this, we produce a tailored improvement plan, giving you clear recommendations for making your home warmer, more efficient, and more economical to run.

Start Saving Today

If you’re ready to upgrade from an outdated boiler; whether it’s a back boiler, system boiler, or old combi, The Eco Advisory Bureau can help you make the transition smoothly and affordably.

Contact us today to arrange your free boiler assessment and find out if you qualify for an ECO4 grant or one of our low-cost installation packages.

See if Your Home Qualifies for ECO4