diagram of energy efficiency scale

Boiler Efficiency Explained

Upgrading your boiler to a more efficient model can save you money on your monthly fuel bill. Older, less efficient boilers waste energy and money, while newer models are much more efficient and cost-effective. By upgrading to a new boiler, you can lower your monthly fuel costs and improve the comfort of your home.

What is boiler efficiency?

When it comes to boiler efficiency, there are a few key factors that play into how much heat your home will get for the amount of fuel you put in. One of the most important is the boiler’s ability to turn that fuel into usable energy without wasting any of it. This is determined by various factors, including the boiler’s design and the quality of its construction.

What is ErP?

The Energy Related Products Directive (ErP) is an EU directive that phased out inefficient appliances. The directive sets minimum efficiency standards for products such as boilers, air conditioners, and refrigerators. Products that meet the ErP standards are labelled with an energy efficiency rating from A to G.

Appliances that are not ErP compliant will eventually be phased out and replaced with more efficient models. If you’re shopping for a new boiler, look for one with an A or B energy efficiency rating.

ErP directive applies to heating products in Europe and has two benefits.

  • Clear energy labelling allows consumers to choose the most energy-efficient products, reducing carbon emissions and saving money on energy bills.
  • The Ecodesign Directive is a European Union directive aimed at increasing the energy efficiency of products. The directive was introduced in 2005 with the aim of reducing greenhouse gas emissions, and it has been amended several times since then. In September 2015, it required that products meet higher energy efficiency standards

Boiler manufacturers and retailers have a responsibility to ensure that their products are accurately labelled. This means that the boiler’s efficiency should be clearly stated so that consumers can make an informed decision about which model to buy. The installer who fits your new boiler is also responsible for ensuring that it is efficient. If you’re not happy with the efficiency of your boiler, you should contact the manufacturer or installer to discuss your options.

What is SEDBUK?

The ErP ratings were introduced to replace the SEDBUK ratings because the ErP ratings are a more accurate way of measuring a boiler’s efficiency. The SEDBUK ratings only measure the efficiency of the boiler when it is in standby mode, while the ErP ratings measure the efficiency of the boiler when it is actually heating your home.

What is Boiler Plus?

Boiler Plus is a government scheme that requires new gas boiler installations to meet certain requirements for increased efficiency. This is designed to help homeowners save money on their energy bills and reduce their carbon emissions.

One of the main benefits of Boiler Plus is that it encourages homeowners to upgrade to more energy-efficient boilers. A newer, more efficient boiler can save you up to £340 a year on your energy bills, so it’s definitely worth considering if your boiler is getting old and inefficient.

Boiler Plus also introduces some new requirements for boilers, such as the need for a carbon monoxide alarm and an automatic shut-off in case of high levels of carbon monoxide. This is a great safety measure that will help to protect you and your family from the dangers of carbon monoxide poisoning.

Overall, Boiler Plus is a great initiative that can help you save money on your energy bills and make your home safer.

The Boiler Plus initiative sets minimum requirements for the efficiency of gas-fired boilers. These requirements must be met in order to sell boilers in the UK. The initiative was introduced in response to the Energy Performance of Buildings Directive, which requires all new buildings to achieve a minimum level of energy performance.

Gas boilers must be at least 92% efficient in order to meet the minimum requirements of the Boiler Plus initiative. However, there are a number of ways to improve your boiler’s efficiency and lower your heating bills.

Benefits of an efficient boiler

Replacing an old, inefficient boiler with a new, more efficient model can result in significant savings on your heating bills. Newer boilers are more efficient at converting fuel to heat, so you’ll use less energy to keep your home warm. Additionally, newer boilers have been designed to produce less pollution, so you’ll be doing your part to help the environment.

ways to make your boiler more efficient

1. Annual boiler service

Having your boiler serviced every year is important to keep it running efficiently. A service can help to spot potential problems and fix them before they become more serious and expensive to repair. It can also improve the efficiency of your boiler, helping to lower your heating bills.

2. Bleed the radiators

Bleeding your radiators is a process of releasing air from the radiator using the bleed valve. This is usually done when the heating system is first installed and then again every two years. If you don’t bleed your radiators, they will eventually become blocked and the energy required to heat your home will be increased.

3. Keep the water pressure topped up

A boiler operates more efficiently with a higher pressure because it is able to create more heat. This is due to the increased thermal energy that is created by the combustion process. The increased pressure allows for a greater volume of gas flow, which helps the boiler reach its optimal operating temperature sooner. Additionally, a higher pressure helps to prevent scale formation on the heat exchanger.

4. Insulate cylinder and pipes

Making sure your property is well insulated is key to keeping your home warm and improving boiler efficiency. This includes insulating the cylinder and pipes, as these are often the areas that lose the most heat. You can also install insulation around your doors and windows, and make sure to seal any cracks or gaps that may let heat escape.


Improving boiler efficiency can save you money on your energy bills and help the environment. There are many ways to make your boiler more efficient, so be sure to explore all of your options. If you’re looking for a new boiler, consider investing in an energy-efficient model that will save you even more money in the long run. Thanks for reading!

If you need an energy efficient boiler installed why not choose one of our expert engineers at Heat Quick Direct

For more info and tips check out our guide to central heating systems

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