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Witten by Bernard Morgan (Engineer) & Adam Apperley (Marketing). Published: June 17, 2021. Updated: January 16, 2024

Grant Vortex Blue Oil Boiler Review

The Grant Vortex Blue has now been discontinued. It is no longer available on the Grant website.

The Vortex Blue was an oil boiler range available in a range of models and sizes and as both a system boiler and a combi boiler.

The different size options meant there was likely to be an option that suited your needs for hot water and heating.

If you are interested in a Grant oil boiler, please get a quote and models available today will be shown.

Technical Specification:

Manufacturer Grant 
Model Vortex Blue
Condensing Yes
Efficiency Rating 93%
Energy Efficiency Class A-Rated 
LPG Compatible No
Warranty 10-year warranty*
Central Heating Max. Output 21kW, 26kW and 36kW
Mounting Floor standing
Weight 130 – 225 kg
Dimensions 945 mm (Height) x 658 mm (Width) x 966 mm (Depth)

Key Features:

  • The Grant Vortex Blue Boiler had an ‘A’ energy efficiency rating. It produced efficiencies of between 90.8 – 94.5%
  • Internal and external models – external models included durable coating designed for reliable outdoor operation
  • Suitable for all home sizes
  • Floor standing, so needed additional room to be installed as opposed to a wall-mounted boiler. Could fit in the space of a standard appliance like a washing machine, dishwasher, etc.
  • Came with a 10-year warranty, subject to terms and conditions
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The Grant Vortex Blue was an energy-efficient and reliable oil boiler, that offered a range of options for heating to homes and businesses. This range was compatible with biofuels for those looking to reduce their carbon footprint and switch to a renewable energy source for heating their home.

Like all oil boilers, it was larger than a standard combi boiler. The Grant Vortex Blue range also had an internal and external model, with the external model being heavier and larger than the indoor range.

  • Energy efficient with an ErP ‘A’ rating
  • Combi models included a 24-litre expansion vessel and factory-fitted multi-directional flue supplied as standard
  • Combi models were compatible with Grant EZ-Fit flue systems
  • Includes Riello Blue Flame burner resulting in a cleaner combustion process and extremely low NOx emissions
  • Featured a large heat exchanger which delivers improved hot-water efficiency
  • Relatively easy to install and repair
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Our thoughts:

The Grant Vortex Blue Oil Boiler was a low-polluting and high-performance boiler available in both system, combi, internal and external models. It was also possible to integrate this boiler with some biofuels.

This range came in three sizes – 21, 26 and 36 kW; these outputs will suit most households that can accommodate a floor-standing boiler. This boiler could generally provide adequate hot water for most average-sized family homes.

New technology

The Grant Vortex Blue featured neon diagnostic indicators to make diagnostic tasks easier and automated where possible. This range from Grant was biofuel compatible (dependent on the type of biofuel and % blend).

Ease of installation

The Grant Vortex Blue models came with lots of useful features which make installation easier. Sealed system kits were available for all models. They were also supplied with a factory-fitted multi-directional flue, which saved your gas engineer time and money when installing.


The Vortex Blue is no longer made, but some may still be available in plumbers merchants. It was a good boiler but Grant are moving away from Blue Flame which made this boiler redundant.

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