Looking for the best oil boiler for your home has never been so important, especially with rising fuel costs and the increased environmental awareness. Whether you’re looking for oil combi boilers, condenser oil boilers, or just want to know about the best oil boilers UK, this guide will help you make the optimal decision and possibly save you thousands of pounds in government incentives.
Oil Boiler Efficiency - Why They Matter More Than Ever
Modern oil boilers have come a long way from their predecessors, with the best rated oil boilers now achieving efficiency ratings of up to 95%. This represents a significant improvement over older non-condensing models, which typically operate at around 60-70%. This difference means you can achieve annual savings of up to £500 on your energy bills when upgrading to an A-rated efficient boiler.
For around 1.5 million UK households that use oil heating, having an efficient system isn’t merely about saving money but more about future-proofing your home. With the government pledging to reach net zero carbon emissions by 2050, and possible restrictions on oil boilers by 2026, the most efficient available option is a smart long-term investment.
Ready to check if you are qualified for a free boiler replacement? Government grants for eligible households cover 100% of the upgrade cost, so there has never been a better time to explore your options. Complete our quick 1-minute eligibility form and upgrade your heating system for free!
Top Rated Oil Boilers: The Market Leaders
1. Worcester Bosch Greenstar Danesmoor
Worcester Bosch remains one of the best oil boilers UK manufacturers trust, with the Greenstar Danesmoor featuring up to 93% efficiency ratings. This A-rated boiler line is renowned for its excellence in flexibility and longevity, backed by Worcester Bosch’s industry-leading warranty terms.
Key Features:
- Efficiency levels: 90%+
- Output range: 18kW – 32kW
- Regular, Utility, and External models available
- Solar compatible
- 7-year warranty
- Cost range: £1,738 – £2,657
Worcester Bosch boilers are highly notable for the quality of their build as well as the sophisticated control systems, with leading-edge temperature control features that save energy while ensuring the highest comfort levels are always maintained.
2. Grant Vortex Blue
The Grant Vortex Blue is one of the most efficient oil boilers in the UK, with efficiency levels as high as 95%. This award-winning system has been awarded Which? Best Buy for three consecutive years (2017-2019) and includes an excellent 10-year warranty when fitted by a Grant G1 Installer.
Key Features:
- Efficiency ratings: 90.8% – 94.5%
- Output range: 21kW – 36kW
- Biofuel/HVO compatible
- Price range: £2,100 – £2,605
Grant Vortex Blue’s blue flame burner technology not only enjoys maximum efficiency but also reduces dangerous nitrogen oxide (NOx) emissions by a high percentage, rendering it an environmentally friendly choice for homeowners.
3. Firebird Envirogreen
Firebird is a top manufacturer of condenser oil boilers, and their Envirogreen model boasts efficiency ratings of 94%. Firebird stands out from the rest in that the corporation has an environmental performance focus, and their Blue Supreme range was Europe’s most efficient oil boiler at 97.4%.
Key Features:
- Efficiency ratings: up to 97.4% in premium models
- Output range: 20kW – 44kW
- Compatible with HVO fuel
- Ultra-quiet operation design
- 2-year guarantee (optional extended guarantees)
- Price: £1,560 – £2,550
Space Saving Combined with Efficiency - Oil Combi Boilers
Oil combi boilers are the perfect choice for homes with limited space, or those looking for compact systems that maintain aesthetics without compromising performance. The devices combine central heating with instant hot water, without the need to have extra cylinders or tanks, utilizing new condensing technology to maintain high performance and reliability.
1. The Worcester Bosch Greenstar Heatslave II
Marketed as “The UK’s most popular oil combi boiler”,, and for good reason, the Heatslave II makes effective use of its compactness and reliable performance, performing at efficiency levels of 91+%, with the option of eco hot water mode for additional energy efficiency. Perfect for small and medium homes looking to save on bills without sacrificing comfort and warmth.
2. Grant Vortex Pro Combi
The Grant Vortex Pro combi range boasts excellent efficiency rates of up to 94.5%, which makes it one of the best-rated oil boilers in the combi category. Available in extra slim models where floorspace is limited, it has simple-to-use diagnostic lights and is designed to be compatible with renewable HVO fuel.
3. Firebird Envirogreen HE Combi
With an impressive 93% efficiency across the range, the Firebird Envirogreen HE combination boilers are amongst the most efficient oil boilers on the market. Fast re-heat function gives instantaneous hot water, while the totally insulated build provides ultra-silent operation.
Considering an oil combi boiler upgrade? These efficient systems can significantly reduce your energy bills while freeing up valuable space in your home. Check your eligibility for a free boiler upgrade by completing our simple 1-minute eligibility check!
Summary Securing Yourself With The Most Efficient Heating Solution
The most efficient oil boilers now available can save you plenty of money without causing so much harm to the environment. Whether you are looking for reliability and performance in Worcester Bosch or environmental credentials from the Firebird, choosing the right system for your home has become easier.
The government funding available under the ECO4 scheme has acted like a lifeline for millions of homes, and you can be next. With ECO4 funding covering the whole cost of your upgrade, and the Boiler Upgrade Scheme offering up to £7,500 towards renewable replacements, the barriers to low-carbon heating have never been lower.
ECO Boiler Grants only installs the most reliable systems from premium brands like Worcester Bosch, while securing you with long-term 12 years of warranty. All our Installers are Gas Safe registered to ensure:
- Compliance with building regulations
- Activate manufacturer warranties
- Maximizing efficiency performance
Your next move is easy! Take our short eligibility test to find out what financing options exist for your home. With expert installation, full warranties, and government support, converting to one of these top rated oil boilers may revolutionize your comfort while dramatically dropping your energy bill.
Fill in our form or contact us and take a step towards a comfortable and healthier life!
