Energy Savings Trust Which? 2018
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
Low NOx ready

Low NOx ready

On 26th September 2018, the next phase of the EU’s Energy-related Products Directive will come into effect. New legislation will set maximum nitrogen oxides (NOx) emission levels that space heaters will need to meet, reducing the overall NOx emissions produced from heating. For oil-fired boilers, the NOx emissions target will be a maximum of 120mg/kWh so all oil boilers placed on the market by the manufacturer on or after 26th September will need to be compliant.


One of the overarching objectives of the new legislation is to help improve the air quality by reducing pollution. In response to both Government regulations and a growing demand from homeowners, manufacturers have continuously explored ways to make their products more efficient and sustainable. The good news is that advances with burner technology coupled to Grant’s efficient boiler designs have enabled all of our Vortex Pro and Eco boiler ranges to achieve these new targets with virtually no visible change to the existing line up.

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Configure your flue

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Product code
Set Output
Max Output
NOx Emissions
Tappings Flow/Return
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 22mm Riello Lo Nox a Heating - View View
VTX15/26 Vortex Pro Utility 15-26 21kW 26kW 130kg 860mm 470mm 603mm 91.71 Class 2 22mm Riello RDB a Heating - View View
VTX26/36 Vortex Pro Utility 26-36 31kW 36kW 144kg 900mm 470mm 603mm 93.3 Class 2 28mm Riello RDB a Heating - View View
VTX36/46 Vortex Pro Utility 36-46 41kW 46kW 144kg 900mm 470mm 603mm 90.00 Class 2 28mm Riello RDB a Heating - View View
VTX46/58 Vortex Pro Utility 46-58 52kW 58kW 268kg 1234mm 563mm 786mm 91.94 Class 2 1 1/4" BSPmm Riello RDB a Heating - View View
VTX58/70 Vortex Pro Utility 58-70 64kW 70kW 282kg 1234mm 563mm 786mm 91.61 Class 3 1 1/4" BSPmm Riello RDB a Heating - View View
VTXS15/21 Vortex Pro Utility System 15-26 21kW 26kW 138kg 860mm 470mm 603mm 91.71 Class 2 22mm Riello RDB a Heating - View View
VTXS26/36 Vortex Pro Utility System 26-36 31kW 36kW 167kg 900mm 470mm 603mm 93.3 Class 2 28mm Riello RDB a Heating - View View
VTXS36/46 Vortex Pro Utility System 36-46 41kW 46kW 168kg 900mm 470mm 603mm 90.00 Class 2 28mm Riello RDB a Heating - View View



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