Which Oil Boiler is best?

‘Which oil boiler should I buy?’ is an important question to ask if you’re in the market.

Oil boilers operate similarly to any gas-powered system, they both use their fuels to fire up and heat water. With this heat across the property, you’re able to do all those important jobs like the washing up!

The key to oil boilers, is that the fuel is delivered into your tank. This fuel gets stored somewhere on the property, but it means you’re always aware of the rate you’re going through it. Many options available include going from oil to LPG, but sometimes the opposite is also the best option.

Oil boilers are condensing, including regular/open vent, but deciding which depends on what sort of property you’re currently living in.

The main difference of combi boilers, is that they only heat the water when you actually need it. This way, energy bills are cut down as there’s a lot less work put in to get the same result.

How do Oil Boilers actually work?

When deciding which oil boiler to buy, understanding how they work is extremely important. Essentially, once the oil for the boiler is set alight, cold water can be warmed up by the heat exchanger. This then comes out your taps and showers, or through the central heating system.

Depending on whether you have a combi boiler or a regular boiler, the water itself would come from either the mains supply, or in a cold water storage tank in the attic. For some it’s a decision-maker. However, if you have any concerns about limited space, a combi boiler is probably the best choice for you.

When choosing which oil boiler to buy, the main thing to remember is the nature of the fuel itself. An external storage tank is needed to store your oil. Don’t worry, these are designed to house enough to last 6 to 9 months, so you’ll have plenty of time. While there are options for the size, the maximum for a domestic storage tank is 2,500 litres. However, you should bear in mind that most domestic applications require about 800 to 1,200 litres.

As well as this, modern oil storage tanks have to be double skinned, more commonly known as ‘bunded’.

Many oil boilers use kerosene, AKA ‘C2’, which is one of the cleaner oil types available.

Which Oil Boiler Efficiency

Modern condensing oil boilers have an efficiency rating from 89% up to 93.3%. If you replace your old boiler with a condensing, you’d be getting more energy efficient system for your money. Budget and price play big parts, they’re essential to help you get the right model and boiler size.

Oil boilers are required to have an efficiency of at least 86% to adhere to building regulations. So deciding on an oil boiler, you know you’re getting a quality boiler with excellent efficiency. For older systems past their prime, you’re looking at 60-70%, so you’ll definitely want to be looking for a replacement.

Thermostat Controls

Today, there are smart thermostats available like the Nest Generation 3 Learning Thermostat. With these smart controls combined with a new efficient oil boiler, your energy efficiency will exceed well over 90%. 

Nest Generation 3 Learning Thermostat

Nest Generation 3 Learning Thermostat

With this considered, you can see how a new boiler helps prevents repair costs and any subsequent headaches. 

Let’s not forget that the older the boiler is the harder it is to get parts; parts are expensive especially for oil boilers and it can be a costly call out too. 

With all this considered, you should choose a qualified, reliable professional like B T Morgan who can provide the service that you need.

All installers need to hold the right qualifications to install or replace an oil boiler. These qualifications are usually achieved by attending a BPEC training centre for assessment and examination. Following this, a certificate is issued and is valid for 5 years.

OFTEC (Oil Firing Technical Association) is one of the most recognised certification body for competent persons installing oil boilers. 

Always check with whatever company or engineer you choose that they have these qualification/certifications (or equivalent), before replacing or installing you new oil boiler. You can always check OFTEC’s find an installer page to see if the company you are interested in carrying out the work for you is approved with them. This will give you piece of mind. 

Which Oil Boiler – So what brands are out there?

If you’re wondering which oil boiler is best you, then the first place to start is with the people that make them. An installer like B T Morgan Heating Engineers can always do the job of fitting the boiler well, but your overall comfort will still come down to quality of the product itself just as much.

Let’s take a look and see what’s available in the world of oil boilers………


grant manufacturer of oil boilers

With a more eco-friendly approach to their manufacturing, Grant may offer the best solution if you’re more conscious of energy efficiency and even global warming. They’ve been a dominant presence in the oil boiler arena for over 35 years, and have made repeated efforts to fight issues such as the mentioned global warming as well. They come very recommended by many professionals and remain today one of the best and most efficient oil manufacturers on the market. 

Grant have won the Which Best Buy for 2018 and are in the running again for 2019. 63 Boiler models are available from Grant, they offer a Vortex and Vortex Blue Oil boiler range. These consist of internal, external, system, boiler house, wall hung and combi variants. They have a patented Vortex stainless steel secondary heat exchanger so you can be confident in their durability and efficiency.  

Throughout the range these boilers can achieve between 90.7 – 93.3% Gross SAP2009 annual efficiency. The range is available with heating outputs ranging from 15 to 70kw.  

Which? Best Buy Winner 2018, the Vortex Pro: Internal

Worcester Bosch

worcester bosch oil boiler manfacturer

Another strong entry in the boiler market, Worcester Bosch are one of the most popular brands in the UK. Their headquarters are situated in Worcester where they have been operating in the UK since 1962.

As a manufacturer of all boiler parts including oil and gas boilers, heating controls and hot water cylinders, they frequently appear at the top of customer surveys.

Worcester have two combi boiler models:

For system boilers they have the Greenstar Danesmoor System Utility and External System boiler. The regular boilers they have the Greenstar Danesmoor regular and utility, in external and internal. 

Throughout the range these boilers can achieve up to 89.4% Gross SAP2009 annual efficiency.

Which? Best Buy Winner 2018, the Greenstar Heatslave II

Which Oil Boiler – Cost

The price of your next oil boiler can vary quite a lot.

A decent oil boiler installation can cost you anywhere between £3900 and £5,000 dependent upon what size boiler you require, location and flue etc (and excludes any oil storage tanks). 

You also need to look at the brand behind the boiler, the size of the boiler and the type of boiler itself. As an indication of how long the installation might take, you could be looking between 1-3 days, dependent upon the type of system you are changing from and to for example and Open Vent boiler to a Combination boiler.

A full central heating system could cost between £5,700 – £7,500. This is dependent on the number of radiators required, the style of radiators and positioning in the property etc. The most advice anyone can offer is do the research beforehand, know what you are looking for that way you can prepare yourself a lot better. 

Which Oil Boiler – It takes time!

It’s ok that it might feel like it’s taking a while to get your new boiler sorted. These things don’t happen straight away, and it can take a lot of time and effort to have everything fall into place. That’s why contacting a professional installer like B T Morgan Heating Engineers can really help – we’ll be able to eliminate those worries and make sure you get the best possible service with minimum hassle.

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A new boiler can last well over a decade, so it goes without saying that it’s a long-term investment. The best choice of ‘which oil boiler’ will likely be different for each person reading this, but the ideal way you can find out what’s best for you is by getting a free, no-obligation quote.

A professional installer like BT Morgan Heating Engineers won’t simply name the first oil boiler that comes to our head and designate that a ‘perfect choice’. Instead, we’ll discuss your property and your requirements, then give you professional advice about which oil boiler is the right one for you. After all, a choice like this can save you a lot on your annual energy bills, and who wouldn’t want that kind of result?

Contact us at BT Morgan Heating Engineers or visit our website and let us provide you with the right choice and advice!