EPC Ratings and Your Heating System: What You Need to Know

What Is an EPC?

An Energy Performance Certificate (EPC) rates your home's energy efficiency on a scale from A (most efficient) to G (least efficient). It's required when selling or renting a property, and the rating is based on an assessment of the building's structure, insulation, and heating system.

The certificate also includes recommended improvements and an estimate of potential savings if they're carried out.

How Does Your Heating System Affect Your EPC?

Your heating system is one of the most significant factors in your EPC score. Key considerations:

Boiler Efficiency

A modern A-rated condensing boiler scores significantly better than an older G-rated non-condensing boiler. If your EPC assessment was done with an old boiler, replacing it with a modern one will improve your rating.

Heating Controls

The presence and type of heating controls affects the EPC score. Having a programmer, room thermostat, and TRVs on all radiators improves the rating. A smart thermostat may offer further benefit.

Heat Pump vs Gas Boiler

Heat pumps score very highly on EPC assessments due to their high efficiency and low carbon emissions. Switching from a gas boiler to a heat pump can move a property up one or two EPC bands — significant for both energy costs and property value.

Hot Water System

The efficiency of your hot water provision also contributes. An uninsulated hot water cylinder, for example, scores poorly.

Why EPC Ratings Matter More Than Ever

**Mortgages:** Some lenders now offer better rates for higher EPC-rated properties

**Rental sector:** Minimum EPC standards for rentals are expected to tighten — landlords with EPC E or below face significant risks

**Property value:** Higher EPC ratings correlate with higher sale prices in many markets

**Boiler Upgrade Scheme:** Eligibility for the £7,500 heat pump grant requires a valid EPC

Improving Your EPC Rating

The most impactful heating-related improvements are:

1. Replace an old non-condensing boiler with a modern condensing boiler or heat pump

2. Upgrade heating controls — add a programmer, room thermostat, and TRVs

3. Insulate your hot water cylinder

4. Consider a heat pump — the most significant heating-related EPC improvement available

For advice on EPC-improving heating upgrades, call Halo Heating on 01483 676108.