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if boiler is purchased with installation!

  • GRANT Vortex Outdoor Condensing Combi 21kW

The latest Grant Vortex External condensing combi models feature internal frost protection, 24ltr expansion vessel, neon diagnostic indicators and a factory fitted internal condensate trap (this can be sited externally if preferred), all designed to make installation and servicing easier.

They also feature a multi-directional factory fitted low level flue, external powder coated robust casing, built-in frost protection, a mains isolating switch and a test switch.

The boilers come in three sizes – 21kW, 26kW and 36kW.

With larger than normal heat exchangers, the hot water performance on a Grant Vortex external combi is vastly increased. Featuring two very accurate electronic temperature controls, which allow the boiler to operate in condensing mode on central heating, instant hot water production can be maintained.


  • Award winning condensing heat exchanger
  • Exceptionally quiet
  • Available in three models – 21kW, 26kW and 36kW
  • 5 year guarantee when installed by a G-One accredited installer*
  • High quality external powder coated case
  • Simple and quick to install with no complicated wiring or plumbing
  • Internal condensate trap
  • Electronic Boiler Thermostat
  • Neon diagnostic indicators
  • 24ltr expansion vessel on all models
  • Low NOx Riello burner with plug & socket connection to control panel
  • Efficiency: 89.5 – 91.6% GROSS (SAP2009)

*terms and conditions apply

Typical Hot Water Performance and Dimensions
15 litres per minute at an average temperature of 50°C
Recovery time 4 minutes approx.Based upon 100 litre draw off.


Minimum 2.5 bar (36 psi)
 Maximum 8 bar (115 psi).
*Hot water flow rate is dependant on mains pressure available.

Technical Details

  • Weight (kg): 181.0
  • Height: 945
  • Width: 658
  • Depth: 754
  • Energy Rating (Heating): A
  • Energy Rating (Hot Water): B
  • Load Profile: XL



GRANT Vortex Outdoor Condensing Combi 21kW

  • Product Code: GRANT Vortex Outdoor Condensing Combi 21kW
  • Availability: In Stock
  • £2,341.00


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