Which? 2018 Energy Savings Trust
Vortex Pro: Internal Combi

5 Year guarantee*

Vortex Pro: Internal Combi

Providing both heating and hot water for the home without the need for an additional hot water cylinder, the Vortex Pro Combi features the latest Riello Low NOx burner technology and combines it with Grant’s patented heat exchangers to give an award-winning range that meets the latest low NOx emission targets.

The internal boilers feature a sleek white casing and exceptionally quiet operation making them the ideal choice for utility room installations.

a Heating b Water

Features & benefits

  • *5-year guarantee when installed by a G1 accredited installer (T&C’s apply)
  • Outputs of 21, 26 and 36kW to suit a range of properties.
  • 90.8 - 94.56% Space heating efficiency
  • 24ltr expansion vessel
  • Neon diagnostic indicators making fault diagnostics easier
  • Features the unique Grant Vortex stainless steel heat exchanger which, due to its low water content and larger surface area, vastly increases the hot water performance.
  • With a low system pressure cut off switch, the combi protects itself in the unlikely event of system water loss.
  • There are two very accurate electronic temperature controls which allow the boiler to operate in condensing mode on central heating whilst maintaining its instant hot water production.
  • The Vortex Pro Combi XS is a compact 26kW boiler, developed as an addition to the existing range which means it can replace an older oil-fired combi, as it is only 515mm wide.
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
VTXCOMBI21 Grant Vortex Condensing Combi 21 21kW 21kW 160kg 860mm 614mm 606mm 90.81 Class 2 a Heating b Water XL View View
VTXCOMBI26 Grant Vortex Condensing Combi 26 26kW 26kW 177kg 860mm 614mm 606mm 91.71 Class 2 a Heating b Water XL View View
VTXCOMBI36 Grant Vortex Condensing Combi 36 36kW 36kW 200kg 900mm 614mm 606mm 94.56 Class 2 a Heating b Water XL View View
VTXXSCOMBI26 Grant Vortex Pro Combi XS 26 26kW 26kW 165kg 857mm 515mm 606mm 92.00 Class 2 a Heating b Water XL View View


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