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Grant Vortex Pro Outdoor 26kW Combi Boiler

Part Number : H017535

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Boiler Type

  • Combination Boiler
  • High Efficiency Outdoor Oil-Fired Boiler
  • Sleek Finish

Grant Vortex Pro Outdoor 26kW Combi Boiler

The Grant Vortex Pro Range of external modules offers the same unique features as the Eco External modules including the factory fitted multi-directional flue, high quality external powder coated casing, built in frost protection, mains isolating switch and a test switch.

However, in addition, the boilers have a higher efficiency level and are factory wired to receive an ‘optional’ RF (radio frequency) wireless programmer. In this situation, the receiver can be plugged into the control panel of the module, enabling the boiler to be operated using a remote controller from any room inside the house, without the need for hard wiring.

Features and Benefits:

  • Combination Boiler
  • High Efficiency Outdoor Oil-Fired Boiler
  • Sleek Finish
  • Exceptionally Quiet Operation
  • Fitted with Tried and Trusted Riello RDB Lo-NOx Burner
  • Award-Winning, Unique Grant Vortex Stainless Steel Heat Exchanger
  • 26kW Output
  • 89.5- 91.6% Gross SAP2009 Annual Efficiency
  • Size: 945mm x 658mm x 754mm (HWD)
  • 5 Year Manufacturer Guarantee (When Installed by a G1 Accredited Installer)

Technical Images


Technical Specifications

Manufacturer Guarantee 5 Years
Max Heat Output 26
Boiler Type Combi Boiler
Manufacturer Part Number VTXOMCOMBI26

Frequently Asked Questions

  • What is the difference between the Grant Vortex boiler and the Grant VortexBlue boiler?

    The Grant Vortex boiler range uses a low NOx yellow flame burner, whereas the Grant VortexBlue boilers uses an ultra-Lox blue flame burner. The combustion head on the VortexBlue’s burner is specially designed to re-circulate the combustion gases. Re-circulating the combustion gases in this way significantly reduces NOx emissions and produces the clean blue flame which gives the technology its name.

  • What size of boiler do I need?

    Before selecting your new boiler, Grant recommend requesting that your installer performs a heat loss estimation of your home to ensure that you select the most appropriate size and type of boiler. Heat loss depends on the efficiency of any heat retaining methods that can be implemented in your home, for example loft insulation, double glazing, cavity wall insulation, draught proofing, etc. These practises could mean that your new boiler may need to be smaller than the one that it is replacing.

  • Can I run a new Grant Vortex boiler on an older heating system?

    As long as the system is thoroughly cleansed and updated to fully pumped operation, it is possible to run a Grant oil boiler on an older heating system.

  • Can I use my existing flue system for my new Grant boiler?

    Unfortunately, in most cases you will not be able to use an existing flue system with a new boiler. Condensing boilers have a lower flue gas temperature which can lead to harmful condensation in the chimney/flue. You will need to ensure that you install a Grant approved flue system which is stainless steel and sealed securely at the joints to prevent it from leaking. All Grant external modules come with a factory fitted flue system.

  • How often should a Grant boiler be serviced?

    Grant recommend that an oil boiler operating on kerosene should be serviced every twelve months, and an oil boiler operating on biofuel or gas oil should be serviced bi-annually.

  • I am worried that my oil supply could run out, how would this affect my system?

    Grant recommend keeping your oil tank filled as required to ensure that the oil does not run out. If your oil supply does run out, you should contact a qualified oil heating engineer to bleed the system once the tank has been filled. It is recommended that after filling, a period of about an hour is allowed for any sediment that has been disturbed in the oil tank time to settle before operating the boiler. With an oil boiler, there is a risk of air and contaminants that sit in the bottom of your oil tank (water and sludge) reaching the oil line and ultimately the burner. This will affect the operation of your boiler, however maintaining an adequate oil level in the tank can prevent this from happening and causing further damage.

  • What type of flue should I fit with a Grant Vortex External Combi boiler?

    All of Grant’s external combi models have a multi-directional flue already fitted. This factory-fitted low level discharge flue helps make the installation straightforward and simple to complete with the flue already installed and in place. Alternative Grant flue systems are also compatible.

  • Are Grant’s Vortex External Combi boilers supplied with an expansion vessel and, if so, what size?

    Every Grant Vortex External Combi is supplied with a 24 litre expansion vessel as standard. This large, factory-fitted expansion vessel should mean that, for most installations, no further additional expansion vessel will be required. In the majority of circumstances, 24 litres will provide more than sufficient room for the expansion from both the boiler and heating system. Please note, the system volume will still need to be checked.

  • How much clearance should be left around the installed unit?

    With all Grant Vortex External Combi boilers, adequate clearance must be left around the boiler. Grant recommends that a minimum clearance of 600mm above the boiler is left to allow for the removal of the top panel and 600mm at each end to allow access to the burner and condensate trap. Providing sufficient clearance will enable engineers easy access for service and maintenance of the product in the future.

  • What size are the flow and return connections on Grant Vortex External Combi boilers?

    Both the 21kW and 26kW Vortex External Combi boilers are supplied with and use 22mm flow and return connections. Meanwhile, the larger model, the 36kW boiler, uses 28mm flow and return connections.

  • Where are the automatic and manual air vents located on a Grant Vortex External Combi?

    Each Grant Vortex External Combi boiler is fitted with two automatic air vents at the top of the boiler – one is located on the top of the primary store and the second in on the heating flow pipe. In addition, a single manual air vent is also fitted at the top of the boiler on the return pipe.

  • What coating is applied to Grant Vortex External Combi casings?

    Grant’s Vortex External Combi boilers have a high-quality external powder coated casing. This is a durable material designed to provide protection against the weather and elements. Each boiler also has an insulated weatherproof enclosure made of galvanised steel.

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