Grant VortexBlue External Combi 26kW Oil Boiler

Grant VortexBlue External Combi 26kW Oil Boiler

The Grant VortexBlue External Combi 26kW Oil Boiler is an external condensing oil-fired combination boiler designed to provide central heating and domestic hot water from a single appliance.

The VortexBlue External Combi 26 is identified by Grant product code VTXBFOMCOMBI26 and delivers a 26kW heat output, equivalent to approximately 88,700 Btu/h. It is designed for external installation and incorporates a weatherproof, powder-coated enclosure to protect the boiler in outdoor environments.

Key Features

• Grant VortexBlue External Combi 26
• Product code: VTXBFOMCOMBI26
• 26kW heat output
• Approximately 88,700 Btu/h
• Condensing oil boiler
• External installation
• Weatherproof galvanised-steel enclosure
• Powder-coated external casing
• Integrated domestic hot-water production
• Designed for a sealed central-heating system
• Mains-pressure domestic hot water
• Riello RDB2.2 BG2 BLU low-NOx burner
• High-efficiency hot-water pump
• 24-litre expansion vessel
• Built-in system pressure gauge
• Built-in condensate trap
• Thermostatic blending valve
• Flexible filling loop
• Electronic boiler thermostat
• Overheat protection
• Multi-directional flue options
• Front service access
• Suitable for external wall or free-standing installation

Grant’s installation documentation confirms that the VortexBlue External Combi range is designed for external installation and can be positioned against a wall or free-standing away from the property where required.

26kW Heating Output

The Grant VortexBlue External Combi 26 has a maximum heat output of 26.0kW, providing approximately 88,700 Btu/h of heating capacity. Grant’s burner settings identify the 26 model as using the RDB2.2 BG2 BLU 26 burner configuration.

This makes the boiler suitable for residential heating applications where an external oil-fired combination boiler is required.

External Oil Boiler Design

The VortexBlue External Combi 26 has been specifically designed for outdoor installation.

Its insulated weatherproof enclosure is manufactured from galvanised steel with a powder-coated finish. This provides a durable external housing while allowing the boiler to be installed outside the main living space.

The external design can be particularly useful where there is limited indoor boiler-room or utility-room space.

Grant’s documentation states that the appliance can be installed externally against a wall or free-standing at a suitable location away from the property, subject to the installation requirements.

Integrated Combi Hot Water

Unlike a standard system or regular oil boiler, the VortexBlue External Combi 26 incorporates domestic hot-water functionality.

Grant describes the VortexBlue Combi range as being designed for sealed central-heating systems while supplying domestic hot water at mains pressure.

The 26kW model has a typical hot-water performance of approximately 15 litres per minute, with performance dependent on available mains-water pressure and incoming water temperature. The published figures are based on an incoming mains-water temperature of 10°C.

Condensing Oil Boiler Technology

The VortexBlue range uses condensing technology to recover additional heat from the combustion process.

The Grant product fiche classifies the VortexBlue external models as condensing boilers and gives the VortexBlue 26 external module a seasonal space-heating efficiency of 91.71% and an A energy-efficiency rating.

For the External Combi 26 specifically, Grant’s published technical data gives a 26kW heat output and the VortexBlue burner settings specify a factory-set 26.0kW configuration.

Low-NOx Blue Flame Burner

The VortexBlue External Combi 26 uses a Riello RDB2.2 BG2 BLU burner configuration.

Grant developed the VortexBlue range around blue-flame, low-NOx combustion technology. Grant states that the VortexBlue range was designed to exceed applicable low-NOx targets and incorporates low-NOx burner technology.

The 26kW burner configuration uses:

• Riello RDB2.2 BG2 BLU burner
• 26.0kW heat output
• 0.65/80°ES nozzle
• 10.0 bar oil pressure
• 2.16kg/h fuel flow rate
• Approximately 75–80°C flue-gas temperature
• 12.0% CO₂ setting
• Approximately 28.5m³/h flue-gas volumetric flow rate

These figures are manufacturer burner-setting data and should be used for technical reference rather than as commissioning instructions for an individual installation.

Sealed Central Heating System

The Grant VortexBlue External Combi 26 is designed for a fully pumped sealed central-heating system.

The boiler incorporates an expansion vessel, system pressure gauge, overheat thermostat and other components required for the heating system configuration. Grant’s documentation specifically states that the VortexBlue internal and external combi models are suitable for fully pumped sealed systems only.

Compact External Installation

Although this is a full combination oil boiler, the external casing keeps the installation outside the main living area.

The published dimensions for the VortexBlue External Combi range show approximately:

• Height: 945mm
• Width: 658mm
• Depth: approximately 754mm
• Dry weight: 206kg for the 26kW model

The exact installation clearances, flue arrangement and base requirements must be checked against the current Grant installation documentation before installation.

Boiler Connections

For the VortexBlue External Combi 26, Grant specifies:

• Heating flow: 22mm
• Heating return: 22mm
• Cold-water inlet: 15mm
• Domestic hot-water outlet: 15mm
• Pressure relief: 15mm

The boiler’s water content, including the 32-litre primary store, is approximately 48.5 litres.

Grant VortexBlue External Combi 26 Technical Specifications

Technical specifications are based on Grant’s published VortexBlue documentation. Installation, commissioning, fuel supply, flue arrangement and clearances must follow the manufacturer’s current instructions and applicable local requirements.

Why Choose the Grant VortexBlue External Combi 26?

The Grant VortexBlue External Combi 26 offers a practical combination of heating and hot-water functionality in an outdoor oil boiler.

Key advantages include:

• 26kW heat output
• A-rated condensing performance
• Integrated domestic hot-water production
• Mains-pressure hot water
• External weatherproof casing
• Low-NOx Riello blue-flame burner
• Fully pumped sealed heating system
• Built-in expansion vessel
• Built-in system pressure gauge
• High-efficiency hot-water pump
• Flexible external flue options
• Front service access
• Durable powder-coated casing

Applications

The Grant VortexBlue External Combi 26 can be considered for:

• Residential heating systems
• Detached and semi-detached homes
• Rural properties using oil heating
• Properties without mains gas
• Boiler replacement projects
• External boiler installations
• Heating upgrades
• Properties with limited internal boiler space
• Installations requiring integrated hot water

Frequently Asked Questions

What is the Grant VortexBlue External Combi 26?

The Grant VortexBlue External Combi 26 is a 26kW external condensing oil-fired combination boiler designed to provide central heating and domestic hot water.

What is the product code?

The product code for the Grant VortexBlue External Combi 26 is VTXBFOMCOMBI26.

What is the heat output?

The VortexBlue External Combi 26 has a 26kW maximum heat output, equivalent to approximately 88,700 Btu/h.

Is the Grant VortexBlue External Combi 26 a condensing boiler?

Yes. The VortexBlue External Combi range uses condensing oil-boiler technology, and Grant’s product documentation identifies the VortexBlue external models as condensing boilers.

Is it an external oil boiler?

Yes. The VortexBlue External Combi is specifically designed for external installation in its weatherproof enclosure.

Does it provide domestic hot water?

Yes. The VortexBlue Combi range supplies domestic hot water at mains pressure. The 26kW model has a typical hot-water performance of approximately 15L/min, depending on mains pressure and incoming water temperature.

What type of oil does the boiler use?

The VortexBlue External Combi range is designed for oil-fired heating using kerosene. Grant’s technical documentation specifically identifies the heat-output data for kerosene.

What is the energy rating?

Grant’s product fiche gives the VortexBlue 26 external model an A energy rating and a seasonal space-heating energy efficiency of 91.71%.

How much does the Grant VortexBlue External Combi 26 weigh?

The dry weight of the VortexBlue External Combi 26 is approximately 206kg.

Can it be installed against an external wall?

Yes. Grant states that the VortexBlue External Combi boilers are designed for external installation either against a wall or free-standing away from the property, as appropriate.

Where can I buy the Grant VortexBlue External Combi 26?

The Grant VortexBlue External Combi 26kW Oil Boiler is listed by EuroFuelSupply for European supply. Wholesale and project enquiries can also be made for larger heating requirements.