Vortex Pro: External

Vortex Pro: External

a Heating

10 Year guarantee*

Each Vortex Pro External oil boiler combines Grant’s proven condensing boiler technology with the latest Riello RDB compact burner.

Grant Vortex Pro External modules offer a factory fitted multi-directional flue, high quality external powder coated casing, built-in frost protection, mains isolating switch and a test switch. Sealed system kits are also available for these oil-fired boilers, and each model has a factory fitted frost stat and condensate state.


Features & benefits

  • *10 year guarantee when installed by a G1 Installer (Terms and Conditions apply)
  • Models range in size from 15kW up to 70kW
  • Achieves excellent space heating efficiencies
  • Sealed system kits are available for the 15-26kW and 26-46kW models
  • Grant’s pre-assembled sealed system kits include: an expansion vessel (size varies), automatic air vent, pressure relief valve and circulating pump. A filling loop and pressure gauge are also supplied as part of the kit. These can be fitted within the module casing, or ideally in a convenient site within the building, located between the cold main and central heating
  • Supplied with a factory fitted, multi-directional flue to help reduce installation time
  • Durable design for all weather conditions
  • Quiet operation
  • This range is biofuel compatible (depending on the type of biofuel and % blend)

Awards & Accreditations


Case Studies

Efficiency through design

Efficiency through design

Grant’s oil boilers incorporate several design features which enable each model to work most efficiently. Each boiler utilises the patented Vortex stainless steel condensing heat exchanger and turbulator baffle system, enabling the boilers to extract energy from the latent heat which would normally be lost through the flue. This award-winning technology has been recognised throughout the industry and it is popular with heating engineers and householders alike.

One of the many reasons installers choose Grant boilers is the choice available, with a boiler to suit many installation applications. View the complete boiler range here.


Product code
Set Output
Max Output
NOx Emissions
Tappings Flow/Return
Energy Rating
Load Profile
Energy Label
Product Fiche
VTXOM15/26 Vortex Pro External 15-26 21kW 26kW 143kg 908mm 505mm 800mm 91.71 Class 2 22mm Riello RDB a Heating - View View
VTXOM26/46 Vortex Pro External 26-46 41kW 46kW 162kg 910mm 505mm 796mm 90.00 Class 2 28mm Riello RDB a Heating - View View
VTXOM46/70 Vortex Pro External 46-70 64kW 70kW 288kg 1239mm 586mm 947mm 91.61 Class 3 1¼" BSPmm Riello RDB a Heating - 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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