Vortex Eco: External

Vortex Eco: External

a Heating

5 Year guarantee*

When a competitively priced, outdoor oil-fired boiler is needed, the Grant Vortex Eco External range can provide the solution.

The Grant Vortex Eco External boilers feature Grant’s patented stainless steel heat exchanger, the latest Riello low NOx burner technology and have a high quality, durable powder coated casing for external installations. Sealed system models are available and all the Eco External boilers have multi-directional flueing options giving installers flexibility when it comes to installation.


Features & benefits

  • *5 year guarantee when installed by a G1 Installer (Terms and Conditions apply)
  • Models include 15-21kW, 21-26kW and 26-35kW which are all also available as sealed system models
  • Achieves space heating efficiencies of 91.7 – 92.7%
  • Supplied with built in frost protection, mains isolating switch and test switch
  • Factory-fitted multi-directional flue
  • Competitively priced external condensing oil-fired boiler
  • External casing is finished with a high quality, powder coat paint
  • Sealed system models include: 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
  • This range is biofuel compatible (depending on the type of biofuel and % blend)

Awards & Accreditations


Case Studies

Develop your business with Grant

Develop your business with Grant

As well as manufacturing highly efficient oil-fired boilers which are reliable in operation and designed to be installer friendly for installation and maintenance, Grant UK also supply an extensive range of renewable heating technologies. The move towards Net Zero carbon targets will mean that renewable heating systems will become more popular.

To help heating engineers grow their businesses and transition into the renewables heating market, Grant UK have a range of product training courses, both face to face and online, available for installers. Read more about the Grant Training Academy and eLearning Academy here.


Product code
Set Output
Max Output
NOx Emissions
Tappings Flow/Return
Energy Rating
Load Profile
Energy Label
Product Fiche
VTXOMECO15-21 Grant Vortex Eco External 15-21 21kW 21kW 113kg 908mm 505mm 800mm 92.7 Class 2 - - a Heating - View View
VTXOMECO21-26 Grant Vortex Eco External 21-26 23.5kW 26kW 113kg 908mm 505mm 800mm 91.7 Class 2 - - a Heating - View View
VTXOMECO26/35 Grant Vortex Eco External 26-35 31kW 35kW 142kg 908mm 505mm 800mm 92.4 Class 2 - - a Heating - View View
VTXSOMECO15/21 Grant Vortex Eco External System 15-21 21kW 21kW 136kg 908mm 505mm 800mm 92.7 Class 2 - - a Heating - View View
VTXSOMECO21/26 Grant Vortex Eco External System 21-26 23.5kW 26kW 136kg 908mm 505mm 800mm 91.7 Class 2 - - a Heating - View View
VTXSOMECO26/35 Grant Vortex Eco External System 26-35 31kW 35kW 152kg 908mm 505mm 800mm 92.4 Class 2 - - 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

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