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if boiler is purchased with installation!

Pay monthly option available
if boiler is purchased with installation!

  • GRANT VortexBlue External 15-21kW

The Grant VortexBlue external modules have some of the highest oil-fired boiler efficiencies available today. These models are ideal for situations where a white cased kitchen/utility version is not always the best solution, possible due to limited space within the home.

Our external VortexBlue range is available in outputs from 15kW up to 36kW with SAP 2009 gross seasonal efficiencies of between 90.7%-93.3%.


  • Award winning Vortex condensing heat exchanger
  • Market-leading Riello Blue Flame burner
  • 10 year guarantee when installed by a G-One accredited installer*
  • Factory-fitted multi-directional flue
  • High quality, external powder-coated casing
  • Built-in frost protection
  • Main isolating switch and a test switch

Sealed System Kits

Grant VortexBlue external modules can be converted to sealed system operation by purchasing a pre-assembled kit from Grant UK. This 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 fitted within the module casing or, ideally, in a convenient site within the building located between the cold main and central heating return. These are the same sealed system kits that are used with the Vortex Pro External models (Part Codes: VTXOMSSKIT21, VTXOMSSKIT26 and VTXOMSSKIT46).

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Technical Details

  • Weight (kg): 143.0
  • Height: 908
  • Width: 505
  • Depth: 1005
  • Energy Rating (Heating): A
  • Energy Rating (Hot Water): N/A

GRANT VortexBlue External 15-21kW

  • Product Code: GRANT VortexBlue External 15-21kW
  • Availability: In Stock
  • £1,824.00


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