Energy Savings Trust
Vortex Pro: External

5 Year guarantee*

Vortex Pro: External

The Grant Vortex Pro external models combine our existing proven condensing boiler technology with the latest Riello RDB low NOx compact burner.

The 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. The range has some of the highest energy efficiency ratings in the UK which not only significantly lowers fuel bills but also considerably reduces greenhouse gas emissions and lessens the environmental impact of domestic hot water and heating systems

a Heating

Features & benefits

  • *5-year guarantee when installed by a G1 accredited installer (T&C’s apply)
  • Outputs ranging from 15-70kW to suit a range of properties.
  • 90.8 - 94.56% Space heating efficiency making the range one of the most efficient boilers on the market.
  • Factory-fitted multi-directional flue saving time at installation stage
  • High quality, external powder-coated casing and built-in frost protection designed for all weather conditions
  • Unlike traditional oil-fired boilers the Grant Vortex condensing boiler has a built-in stainless-steel heat exchanger incorporating our unique turbulator baffle system which cools the gases to a point where the latent heat, normally lost to the atmosphere through the flue, can be usefully extracted. The additional energy recovered enables the boiler to operate continuously at much higher efficiency levels, resulting in lower heating and hot water running costs.
  • Exceptionally quiet operation
  • Unique Grant Vortex stainless steel heat exchanger
  • Exceptionally quiet operation
  • The Grant Pro range of Standard Vortex external modules can be converted to sealed system operation by purchasing a pre-assembled kit from Grant UK. The sealed system kit includes 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
Grant is the only oil boiler manufacturer to achieve Which? Best Buys for three years running

Grant is the only oil boiler manufacturer to achieve Which? Best Buys for three years running

Consumer group Which? have published the results of their 2019 oil boiler survey. Amongst the range of products to receive Which? Best Buys this year are all of Grant’s Vortex Pro Utility oil boilers. This is the third year running that Grant boilers have achieved this accolade making them the only oil boiler brand to be awarded Which? Best Buys in 2017, 2018 and 2019.

The Which? Best Buy logo is widely recognised as an endorsement that reflects confidence, trust and reliability in products. The Which? Best Buys and the supporting surveys play an important role in the decision-making process for householders researching new appliances for their home. Grant Engineering is therefore thrilled to have the high-quality build of their Vortex Pro Utility models, for example, acknowledged in the latest Which? survey with Best Buy status.

Read more on our news page.


Product code
Set Output
Max Output
NOx Emissions
Energy Rating
Load Profile
Energy Label
Product Fiche
VTXOM15/21 Vortex Pro External 15-21 21kW 21kW 109kg 879mm 385mm 734mm 90.81 Class 2 a Heating - View View
VTXOM15/26 Vortex Pro External 15-26 21kW 26kW 143kg 908mm 505mm 800mm 91.71 Class 2 a Heating - View View
VTXOM26/36 Vortex Pro External 26-36 31kW 36kW 162kg 908mm 505mm 800mm 94.56 Class 2 a Heating - View View
VTXOM36/46 Vortex Pro External 36-46 41kW 46kW 162kg 908mm 505mm 800mm 90.00 Class 2 a Heating - View View
VTXOM46/58 Vortex Pro External 46-58 52kW 58kW 274kg 1240mm 587mm 945mm 91.94 Class 2 a Heating - View View
VTXOM58/70 Vortex Pro External 58-70 64kW 70kW 288kg 1240mm 587mm 945mm 91.61 Class 2 a Heating - View View


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