Vortex Pro: External Combi

Vortex Pro: External Combi

a Heating b Water

10 Year guarantee*

Ideal for installations where space inside the home is limited, the Grant Vortex Pro External Combi range delivers high efficiencies and excellent hot water performances.

All three Grant Vortex Pro External Combi boilers have a high quality, external powder-coated casing, built-in front protection and a factory fitted, multi-directional flue. Designed with the installer in mind, each of these oil boilers is also supplied with a 24ltr expansion vessel as standard.


Features & benefits

  • *10 year guarantee when installed by a G1 Installer (Terms and Conditions apply)
  • Models include 21kW, 26kW and 36kW
  • Achieves space heating efficiencies of 90.81 – 94.5%
  • Designed for all weather conditions with durable external casing, built-in frost stat and factory fitted internal condensate trap
  • 24ltr expansion vessel supplied as standard with all models
  • Feature Grant’s stainless steel heat exchangers with Riello’s latest low NOx burner
  • Factory fitted multi-directional flue
  • Neon diagnostic indicators enable user-friendly operation
  • This range is biofuel compatible (depending on the type of biofuel and % blend)

Awards & Accreditations


Case Studies

Riello RDB BX Burner

Riello RDB BX Burner

All of Grant’s floor standing Vortex oil boilers feature the Riello RDB BX low NOx burner. To help heating engineers understand the design and operation of these burners, Grant has a ‘Toolbox Talk’ video which talks through the features of this burner.

Head over to Grant UK’s YouTube Channel to watch this and other useful tutorial videos.


Product code
Set Output
Max Output
NOx Emissions
Tappings Flow/Return
Energy Rating
Load Profile
Energy Label
Product Fiche
VTXOMCOMBI21 Vortex Pro External Combi 21 21kW 21kW 181kg 945mm 658mm 754mm 90.81 Class 2 22mm Riello RDB a Heating b Water XL View View
VTXOMCOMBI26 Vortex Pro External Combi 26 26kW 26kW 206kg 945mm 658mm 754mm 91.71 Class 2 22mm Riello RDB a Heating b Water XL View View
VTXOMCOMBI36 Vortex Pro External Combi 36 36kW 36kW 225kg 945mm 658mm 754mm 94.56 Class 2 28mm 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

Home Heating Blog

Discover more about home heating solutions, care and support with our informative blogs

Read more

Looking to develop your product knowledge?

Our award winning Training Academy allows us to offer a wide range of training courses including Grant product training and industry qualifications.

Find out more

Looking to fit and endorse Grant products?

The G1 scheme provides installers with the tools they need to fit and endorse Grant UK products - from training through to marketing support

Find out more

Find a Merchant

Use our national merchant search to find a Grant supplier near you

Find a Merchant


Related products

Compare products
Return to top

Recently viewed products

Are you a homeowner? Please click here.