Energy Savings Trust Which? 2017 Which? 2018 Which? 2019
Vortex Pro: Internal

5 Year guarantee*

Vortex Pro: Internal

The Grant Vortex Pro range has some of the highest energy efficiency ratings in the UK which not only significantly lowers fuel bills but also considerably reduces greenhouse gas emissions and lessens the environmental impact of domestic hot water and heating systems. They incorporate the latest Riello low NOx burner technology with Grant’s patented heat exchangers to give an award winning range that meets the 2018 low NOx emission targets.

a Heating

Features & benefits

The Grant Vortex Pro internal models combine our existing proven condensing boiler technology with the latest Riello RDB low NOx compact burner.

The Grant Vortex Pro Range boilers have very high SAP 2009 gross seasonal efficiencies of between 90.7 - 93.3% and feature the ‘award winning’ unique Grant Vortex stainless steel condensing heat exchanger, and turbulator baffle system. The 15-21 utility model has been designed to fit within a kitchen unit and, due to its reduced width, can be used as a direct replacement for most older oil-fired boilers. Sealed system versions are also available. These include a factory fitted expansion vessel, filling loop, pressure gauge, automatic air vent, pressure relief valve and high efficiency circulating pump, enabling boilers to be installed without the need for a feed and expansion tank in the loft

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All Grant Vortex boilers are easy to install and can either be connected to a conventional ‘stainless steel’ flue or one of Grant’s EZ-Fit flue options using an existing chimney. Unlike traditional oil-fired boilers the Grant Vortex condensing boiler has a built-in stainless steel heat exchanger incorporating our unique turbulator baffle system which cools the gases to a point where the latent heat, normally lost to the atmosphere through the flue, can be usefully extracted. The additional energy recovered enables the boiler to operate continuously at much higher efficiency levels, resulting in lower heating and hot water running costs.

  • Award winning range
  • Outputs ranging from 15-70kW
  • 90.7- 93.3% Gross SAP2009 annual efficiency
  • 5 year guarantee when installed by a G1 accredited installer (T&C’s apply)
  • Sleek white casing
  • Exceptionally quiet operation
  • Unique Grant Vortex stainless steel heat exchanger
  • Fitted with tried and trusted Riello RDB Lo-NOx burner
  • Compliant with September 2018 low NOx legislation
Grant is the only oil boiler manufacturer to achieve Which? Best Buys for three years running

Grant is the only oil boiler manufacturer to achieve Which? Best Buys for three years running

Consumer group Which? have published the results of their 2019 oil boiler survey. Amongst the range of products to receive Which? Best Buys this year are all of Grant’s Vortex Pro Utility oil boilers. This is the third year running that Grant boilers have achieved this accolade making them the only oil boiler brand to be awarded Which? Best Buys in 2017, 2018 and 2019.

The Which? Best Buy logo is widely recognised as an endorsement that reflects confidence, trust and reliability in products. The Which? Best Buys and the supporting surveys play an important role in the decision-making process for householders researching new appliances for their home. Grant Engineering is therefore thrilled to have the high-quality build of their Vortex Pro Utility models, for example, acknowledged in the latest Which? survey with Best Buy status.

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Product code
Set Output
Max Output
NOx Emissions
Energy Rating
Load Profile
Energy Label
Product Fiche
VTX15/21 Vortex Pro Utility 15-21 21kW 21kW 97kg 855mm 348mm 566mm 90.81 Class 2 a Heating - View View
VTX15/26 Vortex Pro Utility 15-26 21kW 26kW 130kg 860mm 470mm 603mm 91.71 Class 2 a Heating - View View
VTX26/36 Vortex Pro Utility 26-36 31kW 36kW 144kg 900mm 470mm 603mm 93.3 Class 2 a Heating - View View
VTX36/46 Vortex Pro Utility 36-46 41kW 46kW 144kg 900mm 470mm 603mm 90.00 Class 2 a Heating - View View
VTX46/58 Vortex Pro Utility 46-58 52kW 58kW 268kg 1234mm 563mm 786mm 91.94 Class 2 a Heating - View View
VTX58/70 Vortex Pro Utility 58-70 64kW 70kW 282kg 1234mm 563mm 786mm 91.61 Class 3 a Heating - View View
VTXS15/26 Vortex Pro Utility System 15-26 21kW 26kW 138kg 860mm 470mm 603mm 91.71 Class 2 a Heating - View View
VTXS26/36 Vortex Pro Utility System 26-36 31kW 36kW 167kg 900mm 470mm 603mm 93.3 Class 2 a Heating - View View
VTXS36/46 Vortex Pro Utility System 36-46 41kW 46kW 168kg 900mm 470mm 603mm 90.00 Class 2 a Heating - View View



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