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Vortex Blue: External Combi

10 Year guarantee*

Vortex Blue: External Combi

Grant VortexBlue Blue Flame boilers incorporate the very latest low NOx Riello oil burner technology. This means that the Grant VortexBlue boilers not only meet current low NOx emissions targets but are future proofed against any future stringent low NOx emissions targets.

a Heating b Water

Features & benefits

The intelligent VortexBlue Combi incorporates the latest Riello RDB BLU burner technology and combines it with our award winning Vortex stainless steel heat exchanger.


The Grant VortexBlue Combi features large heat exchangers which, due to their low water content and larger surface area, vastly increased the hot water performance. With a low system pressure cut off switch, the combi protects itself in the unlikely event of system water loss. Additionally, there are two very accurate electronic temperature controls which allow the boiler to operate in condensing mode on central heating whilst maintaining its instant hot water production

  • Compliant with September 2018 low NOx legislation
  • Outputs of 21, 26 and 36kW
  • 89.5- 91.6% Gross SAP2009 annual efficiency
  • Market-leading Riello Blue Flame burner
  • 10 year guarantee when installed by a G1 accredited installer (T&C’s apply)
  • 24ltr expansion vessel
  • Neon diagnostic indicators
  • Factory-fitted multi-directional flue
  • Built-in frost protection
Blue flame technology

Blue flame technology

Grant and Riello’s R&D have together successfully matched and field trialled this new range of innovative appliances. 

As the name suggests, the flame produced is blue in colour, rather than the usual yellow colour of the standard burners fitted in our current Grant Vortex range, which results in a much cleaner combustion process. All of the Grant VortexBlue boilers operate at the very high efficiency levels expected of the Grant Vortex condensing range and have the added benefit of producing extremely low NOx emissions.

In 2018, oil fired boilers installed in the UK will have to meet lower NOx emission targets. Furthermore, it is likely that even more stringent emission levels will be set in future years, so Grant have taken the decision to try and future proof oil fired appliances by moving to very low NOx, Blue Flame technology today.


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Product code
Set Output
Max Output
NOx Emissions
Energy Rating
Load Profile
Energy Label
Product Fiche
VTXBFOMCOMB21 Grant VortexBlue External Combi 21 21kW 21kW 181kg 945mm 658mm 966mm 90.81 Class 3 a Heating b Water XL View View
VTXBFOMCOM26 Grant VortexBlue External Combi 26 26kW 26kW 206kg 945mm 658mm 966mm 91.71 Class 3 a Heating b Water XL View View
VTXBFOMCOM36 Grant VortexBlue External Combi 36 36kW 36kW 225kg 945mm 658mm 966mm 94.56 Class 3 a Heating b Water XL View View



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