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A-Rated Oil Boilers

A-Rated Oil Boilers

A-rated oil boilers are the most efficient boilers you can get.  They can reach an efficiency of 90% or higher if correctly maintained and looked after.  All boilers are given a rating from A – G, with A being the highest.  All new boilers will have an A-rating, meaning they should reach an efficiency of at least 90%. It is hard to determine the rating of an older oil boiler as the rating would have been retrospectively applied.  All A-rated boilers whether gas or oil come with a stamp of approval from the Energy Saving Trust.

Having an energy efficient boiler is crucial when you consider around half of your fuel bills accounts for your heating and hot water within your home.

How is the boiler rating calculated?

The rating is calculated by looking at the efficiency achieved in typical domestic conditions per year.

How to get the best boiler for your home?

Are you considering having a new oil boiler installed but don’t know where you should begin? Our local team of OFTEC engineers are able to help you from initial enquiries through to completion of the project.

It is important to choose a professional heating company to give you advice on the best oil boiler for your home.  This prevents you paying for a boiler that is too powerful for your property or worse, one that cannot cope with your heating and hot water demand.

When considering a new oil boiler our experienced surveyor will come to your home free of charge to assess you current energy needs to ensure you are quoted the best boiler for you.

Types of Oil Boiler

Like natural gas and LPG boilers, there are three types of oil boilers.

Combi Oil Boiler

Combi / combination boilers provide heating and hot water on demand.  They do not require any tanks or cylinders thereby saving space. The downside of a combi boiler can be that if the boiler breaks down you do not have the benefit of a back up immersion.  An immersion acts as an separate source of hot water, which is very useful if your boiler has broken down.

Regular Oil Boiler

A regular oil boiler also called heat only boiler requires storage tanks. This type of boiler will fill up a hot water storage tank usually located in the loft, perfect for those with a high hot water demand.  You will also require a cold water storage tank to feed into the hot water storage tank.

System Oil Boilers

Similar to regular boilers, system boilers only provide your heating and a separate hot water cylinder will produce your hot water.  The main difference is that system boilers do not require a cold water storage tank, as the boiler takes its water from the mains water supply. If you live in a large house with over 3 bathrooms a system boiler can be a very good option.

Best A-Rated Oil Boiler Brands


Grant offer a fantastic range of oil boilers and are known industry wide as the oil boiler specialists.  Their award winning Grant Vortex condensing boiler range  is endorsed by the Energy Savings Trust. They are known as being one of the most efficient oil boiler ranges on the market. Grant oil boilers come with a great 5 years warranty.

Worcester Bosch

Worcester Bosch offer a great range of oil boilers including combi, system and regular boilers.  Many have won multiple awards and come with an A-Rating.  The Worcester heatslave boilers are the UK’s top selling oil boilers and the Danesmoor range has been awarded the Which? best buy multiple times. Suitable for all types of homes that have a heating system which includes stored hot water. Worcester oil boilers come with up to a 7 year warranty if installed by an accredited installer.

What next?

For all Gas and LPG boilers the engineer needs to be Gas Safe Registered, for Oil fired appliances the engineer needs to be registered with OFTEC.  This is really crucial to ensure your new boiler is installed to the correct safety procedures.

If you would like to book a free of charge survey at your home please call 01258 472132 or fill in the form and a member of our team will be in contact.


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