Modern Condensing Gas Boiler

Modern condensing gas boilers are designed to maximise energy efficiency by recovering heat from exhaust gases that traditional boilers expel as waste. For landlords, upgrading to a modern condensing boiler is a practical way to improve EPC ratings, reduce tenants’ energy bills, and provide reliable, comfortable heating.

​

With increasing energy costs and tighter legal standards on property energy performance, upgrading to a condensing boiler helps future-proof rental homes while meeting tenant expectations.

​

Why Upgrade to a Modern Condensing Gas Boiler?

Older boilers often operate at efficiencies as low as 60–70%, wasting energy and increasing heating costs. Modern condensing boilers achieve efficiencies of 90% or higher by capturing latent heat from flue gases that would otherwise be lost. This improved efficiency means tenants use less fuel to heat the home, saving money and reducing carbon emissions.

By upgrading existing, inefficient boilers, landlords can boost their EPC score and maintain compliance with the Minimum Energy Efficiency Standards (MEES) for rental properties.

​

Regulations and Financial Support

Replacing or installing a condensing gas boiler is subject to building and safety regulations to ensure safe, efficient operation. Installation must be carried out by Gas Safe registered engineers.

 

Available grants and funding:

• The Boiler Upgrade Scheme (BUS) offers grants toward the cost of installing low-carbon heating systems including heat pumps; however, it does not cover gas boilers.

• The Energy Company Obligation (ECO4) can provide funding to replace inefficient boilers with modern condensing models for eligible landlords and tenants.

• Some local authorities or charitable schemes may offer additional grants or loans for boiler upgrades.

• Eligibility criteria often depend on EPC rating, tenant income/benefits status, and property characteristics.

• Grants may cover part or all of the installation and equipment costs, reducing upfront expenses.

​

The Boiler Upgrade Process

Upgrading to a modern condensing gas boiler typically involves:

• Assessment: A qualified engineer assesses the existing heating system, checks pipework, radiators, and ventilation, and recommends suitable boiler models sized appropriately for the property.

• Removal: The old boiler is safely disconnected and removed, including extraction of any redundant flues or pipework.

• Installation: The new condensing boiler is installed, often on a wall or in a boiler cupboard, with correct flue positioning for exhaust gases and air supply. Controls and thermostats may also be upgraded.

• Testing and Commissioning: The system is fully tested to ensure safe, efficient operation, and the landlord is provided with manuals and maintenance advice.

Installation commonly takes one to two days, with minimal disruption if planned appropriately.

 

Benefits to Landlords

Upgrading to a modern condensing gas boiler has multiple benefits:

• Higher Efficiency and Lower Bills: Tenants benefit from lower heating costs thanks to improved boiler efficiency, increasing satisfaction and rental appeal.

• EPC Improvement: Boilers contribute significantly to EPC ratings; modern units can raise the property’s rating by one or two bands.

• Compliance: Meets MEES regulations and building safety requirements, avoiding enforcement risks.

• Reliability and Comfort: Modern boilers offer more precise heating control and consistent warmth.

• Reduced Maintenance: New boilers typically carry warranties and require less frequent repairs compared to older systems.

 

Common Questions and Concerns

• How long does a new condensing boiler last? With proper maintenance, condensing gas boilers typically have a lifespan of 10–15 years.

• Are condensing boilers noisy? Modern models operate quietly, similar to standard domestic appliances.

• Can I keep using existing radiators? Usually yes, but older radiators may be inefficient; upgrading these can further increase system efficiency.

• Is a new boiler suitable for all gas properties? Condensing boilers are appropriate for most properties connected to the gas grid. Properties off-grid may require alternative heating solutions.

• What maintenance is required? Annual servicing by a Gas Safe engineer is recommended to maintain efficiency and safety.

​

Getting Started

Landlords should begin by having a Gas Safe registered engineer survey their property’s heating system to assess suitability for a condensing boiler upgrade. This survey will provide recommendations on appropriate models and system improvements.

Next, explore funding options including ECO4 grants and any local support schemes that may apply to your property and tenant profile.

Once installation is scheduled, communicate with tenants about the work timeline and any temporary disruptions. After installation, retain all documentation, warranties, and commissioning certificates.

Regular servicing should be arranged to ensure longevity and ongoing efficiency.

For retrofit recommendation, check grant eligibility and connect with qualified installers, landlords can register for eco-Landlord and take the next step toward a more energy-efficient rental property.