June 29, 2021

Boiler Efficiency Guide

Boiler efficiency is an issue with both heating systems and maintenance. Believe it or not, an energy-efficient boiler reduces your monthly costs. Furthermore, it benefits the environment.

Read ahead to learn more about the boiler efficiency ratings and why they are so essential.


What exactly is boiler efficiency?

Boiler efficiency is the percentage of the heat output of the boiler that is used to do work, in contrast to the total heat output of the boiler.

To find out how much money you spend on a boiler, just utilise its efficiency. Boiler rating higher means reduced energy usage and cheaper energy costs each month.

In other words, boilers used to be more outdated and lacked contemporary technology, as seen above. Thus, the older your boiler is, the more energy it consumes. Choosing the appropriate unit results in long-term cost savings.

This is to assist you compare boilers’ efficiencies, and there are charts and ratings for boilers on every equipment.


Boiler Efficiency Ratings


ErP means energy-related products. This regulation applies to all member nations of the European Union. They developed it to enhance boiler efficiency and cut down on greenhouse gas emissions.

ErP ranks the efficiency of a boiler or heating system according to the letters A-G. A is the best rating and G the worst. Most boilers have an A rating nowadays. A rating levels include A+++, A++, A+, and A. As a percentage, A-rated boilers are equivalent to over 90% efficient, while G-rated boilers are equal to under 70% efficient.


When discussing boilers, you’ll hear terms like “SEDBUK” a lot. SEDBUK is a winter-peaking boiler’s seasonal efficiency. This is the same way boilers in the UK are all graded. Carbon footprint is also assessed here.

There are two varieties, 2005 and 2009 SEDBUK. A is the most efficient, whereas G is the least efficient. The second is % efficient. At percentage points, boilers are more efficient. You can see the ratings table below:


SEDBUK Boiler Efficiency Ratings



However, the SEDBUK rating was superseded in 2015 by the ErP rate. ErP is a European regulation, and it is utilised across Europe as well as in the UK.





How Efficient Is My Boiler?

Do you currently wonder how efficient your heater is? Find out; check the boiler sticker. Anywhere on the boiler, front, rear, or on the bottom. Modern appliances feature stickers showing their efficiency rating.

This label is not seen on ancient heating systems. You or a plumber may have removed the label while you were mounting the boiler. Look for the rating online if there’s no sticker.

A plate or sticker should be beneath the boiler where the pipes protrude. Exact model, size, and/or brand: locate the required component. If you’ve gathered these information, you may use the PCDB database to see how efficient your boiler is.


Don’t know your model number?

Unfortunately, if the bottom plate of the boiler is either missing or illegible, finding out the model number will be difficult.

You should contact a gas-safe certified firm to get your boiler checked. Your boiler engineer may check inside the boiler. They may also offer you a general concept of the model, if there’s no information.

The non-condensing evaporator should have a lower efficiency rating. Efficiency is over 85% if it is condensing.


Choosing the most efficient boiler

You may be wondering which boiler is the most efficient. A few considerations you should take into account before choosing a new kind of water heating system.

Boilers have to be totaled, and their cost compared.

  • The boiler’s pricing;
  • Installation; and does it require extra parts?
  • Risk annually
  • annual service


Boiler Types

  • Gas boilers – for a big family that requires a lot of hot water, this boiler is a suitable option.
  • There are two different kinds of combi boilers: gas and electric. They have minimal operating costs, making them a great option for boiler replacement.
  • installation of an electric boiler is easier and is ideal for small homes and apartments. In larger homes, efficiency may decrease and your energy cost may rise.

Another important statistic to take into consideration is the size of the boiler. Naturally, larger homes need larger boilers. The boiler must also be sized based on the number of bathrooms and people who will use it. Consider the boiler’s position, however. Will it be insulated or not? What else is it going to physically fit into your proposed space?


Condensing vs Non-Condensing Boilers

Both models have advantages and disadvantages. You should make an educated choice by buying one or the other. The condensing kind costs more to install, but it will save money in the long term. Non-condensing vents are rated at 78% efficiency whereas condensing vents are rated at 99% efficiency. Initial costs are lower, but the overall cost and carbon impact are greater.


How much can you save with an energy-efficient boiler?

Your boiler accounts for approximately 55%-60% of your annual energy expenditures. Cut half of them, and you’ll save hundreds of dollars per year. Because here are the figures, for a boiler that is rated 70% efficient, of every £1 spent on heating, 30p goes on wasted energy. A 90% efficiency boiler will cost you 10p every £1. When you combine the annual energy costs for both grades, you may notice a big difference.

Starting April 2018, the ErP mandated a minimum efficiency rating of 92% for all gas boilers in England. They implemented the rule with a purpose in mind. the main objectives are to lower Europe’s carbon emissions and enhance overall energy efficiency as well as greater usage of renewable energy


ECO3 Scheme

If you’re a homeowner in receipt of government benefits you may be eligible for a free upgrade to an energy efficient boiler as part of the new ECO3 government scheme for greener homes. Read more and check your eligibility here.