Vortex Pro: Internal Combi

Vortex Pro: Internal Combi

a Heating b Water

10 Year guarantee*

Grant Vortex Pro Internal Combi boiler range features four models including the slimline Vortex Pro Combi XS which is only 515mm wide.

The Grant Vortex Pro Internal Combi range is a popular choice for installers. Each model can operate in condensing mode for central heating while also maintaining instant hot water production. Reliable in operation, easy to install and straightforward to service, the Vortex Pro Internal Combination oil boilers can fulfil a home’s heating and hot water requirements in a single appliance.


Features & benefits

  • *10 year guarantee when installed by a G1 Installer (Terms and Conditions apply)
  • Models include 21kW, 26kW and 36kW Combis plus the slimline Vortex Pro Combi XS
  • Achieves space heating efficiencies of 91.7 – 94.5%
  • The compact Vortex Pro Combi XS is just 515mm wide and is specifically designed to replace older oil-fired combi boilers
  • Innovative design featuring large heat exchanges with low water content and large surface area to increase hot water performance
  • Two accurate electronic temperature controls
  • 24ltr expansion vessel supplied as standard (supplied externally with Combi XS model)
  • Neon diagnostic indicators designed to aid heating engineers with diagnostics and maintenance
  • Compatible with Grant EZ-Fit flue systems
  • This range is biofuel compatible (depending on the type of biofuel and % blend)

Awards & Accreditations


Case Studies

Correct system design for installations

Correct system design for installations

It is essential that the right boiler size is selected to meet the heating requirements of a property. Installing too small a boiler will cause numerous problems for both the householder and their heating system. Meanwhile, oversizing a system and installing too large a boiler is highly inefficient because the boiler’s output will be greater than what the property requires. This is why correct system design is so important and crucial for achieving maximum system efficiency throughout a home.

If you have an upcoming boiler installation that you would like to discuss with your local Grant UK Sales Representative, please get in touch.


Product code
Set Output
Max Output
NOx Emissions
Tappings Flow/Return
Energy Rating
Load Profile
Energy Label
Product Fiche
VTXCOMBI21 Grant Vortex Pro Combi 21 21kW 21kW 160kg 860mm 614mm 606mm 90.81 Class 2 22mm Riello RDB a Heating b Water XL View View
VTXCOMBI26 Grant Vortex Pro Combi 26 26kW 26kW 177kg 860mm 614mm 606mm 91.71 Class 2 22mm Riello RDB a Heating b Water XL View View
VTXCOMBI36 Grant Vortex Pro Combi 36 36kW 36kW 200kg 900mm 614mm 606mm 94.56 Class 2 28mm Riello RDB a Heating b Water XL View View
VTXXSCOMBI26 Grant Vortex Pro Combi XS 26 26kW 26kW 163kg 857mm 515mm 606mm 92.00 Class 2 22mm Riello RDB a Heating b Water XL View View


EZ-Fit Flue Range

Grant UK supply a comprehensive range of flue systems to suit all Grant Vortex oil-fired boiler ranges

View the Range

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