APN Boilers helps homeowners find experienced oil-heating professionals who can assess the complete installation and recommend a suitable Grant oil boiler.

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Are Grant Boilers Suitable for Your Home?

 

Grant boilers are principally relevant to properties that are not connected to the mains-gas network and use heating oil as their primary fuel.

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A Grant oil boiler may be suitable where a homeowner wants:

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• A replacement for an existing oil boiler

• An internal floor-standing oil boiler

• An external boiler to release space inside the home

• A compact wall-hung oil boiler

• A boiler-house model for a garage or plant room

• An oil combi boiler providing heating and hot water

• A sealed-system oil boiler

• A choice of outputs for different property sizes

• A longer product guarantee through a qualifying installer

• A boiler compatible with selected lower-carbon liquid-fuel blends

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Grant’s current oil-boiler offering is centred on the Vortex range, with heating outputs extending from approximately 15kW to 70kW. Heat-only, sealed-system and combination models are available across different parts of the range.

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The boiler should still be selected through a proper heating assessment. Installing the largest available model does not necessarily improve comfort or efficiency.

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The Grant Oil Boiler Range

 

The Grant oil-boiler range includes several different installation formats.

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Current options include:

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• Grant Vortex Pro Internal

• Grant Vortex Pro External

• Grant Vortex Pro Internal Combi

• Grant Vortex Pro External Combi

• Grant Vortex Eco External

• Grant Vortex Eco Internal Wall Hung

• Grant Vortex Eco External Wall Hung

• Grant Vortex Boiler House

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This variety allows homeowners and installers to consider indoor, outdoor, floor-standing, wall-mounted, combination and traditional heat-only arrangements.

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The most appropriate range will depend on:

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• Available installation space

• Existing boiler location

• Required heating output

• Hot-water requirements

• Whether a separate cylinder is retained

• Condition of the oil tank

• Flue route

• Exposure to weather

• Servicing access

• Available budget

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Grant Vortex Pro Internal Boilers

 

The Grant Vortex Pro Internal range consists of floor-standing oil boilers intended for installation inside the property, a utility area, garage or suitable plant space.

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The current range includes outputs from approximately 15kW to 70kW. Sealed-system versions are also available across selected outputs up to approximately 46kW.

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Grant Vortex Pro Internal boilers may be considered for:

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• Direct replacement of an internal oil boiler

• Utility-room installations

• Garages and dedicated plant spaces

• Larger rural properties

• Heating systems retaining a hot-water cylinder

• Open-vented systems

• Sealed heating systems

• Properties with substantial radiator loads

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The wide range of outputs means that a Vortex Pro Internal boiler can potentially serve anything from a relatively modest home to a much larger property.

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A heat-loss calculation should determine the final output. Selecting an unnecessarily large boiler can lead to inefficient operation and more frequent cycling.

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Grant Vortex Pro External Boilers

 

A Grant Vortex Pro External boiler is housed within a weather-resistant casing and installed outside the property.

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The external range is available in outputs from approximately 15kW to 70kW. Selected models can also be installed with sealed-system kits. The boilers include a factory-fitted multi-directional flue and built-in frost protection.

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An external Grant boiler may be suitable where:

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• Internal space is limited

• The existing boiler is already outside

• A utility room is being converted

• Boiler noise within the property is a concern

• Flue positioning is easier externally

• The homeowner wants to release kitchen or cupboard space

• Servicing access can be provided from outside

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External installation does not mean the boiler can be placed anywhere.

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The installer must consider:

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• Distance from doors and windows

• Flue-clearance requirements

• Boundary positions

• Access for servicing

• Exposure to flooding

• Condensate drainage

• Oil-line routing

• Electrical supply

• Protection from accidental damage

• Appearance and planning considerations

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The external boiler should be installed on a stable and suitable base with clear access for future maintenance.

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Grant Combi Boilers

 

A Grant combi boiler provides central heating and domestic hot water from one appliance.

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Unlike a traditional oil-boiler installation, it does not normally require a separate hot-water cylinder or cold-water storage tank.

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Grant’s current Vortex Pro combi boilers are available as internal and external models in 21kW, 26kW and 36kW outputs.

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A Grant oil combi boiler may suit:

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• Smaller and medium-sized off-grid homes

• Properties with one principal bathroom

• Homes already using an oil combi boiler

• Projects where an airing cupboard is being released

• Properties without space for a separate cylinder

• Households wanting hot water without scheduling a cylinder

• Direct replacement of an older oil-fired combi

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An oil combi boiler is usually larger and heavier than a typical wall-mounted gas combi because it contains additional heating and hot-water components.

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The installer should confirm that the proposed floor and installation area are suitable.

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Grant Vortex Pro Internal Combi

 

The Grant Vortex Pro Internal Combi range is available in 21kW, 26kW and 36kW models.

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The range includes the Vortex Pro Combi XS, a compact 26kW model measuring approximately 515mm wide. It is intended to make replacing some older oil-fired combi boilers more practical where installation space is restricted.

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Current range features include:

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• Outputs of 21kW, 26kW and 36kW

• Stainless-steel heat-exchanger technology

• Space-heating efficiencies of approximately 91.7% to 94.5%

• Large heat exchangers intended to support hot-water performance

• A 24-litre expansion vessel

• Compact XS option within the 26kW range

• Extended guarantee eligibility through a Grant G1 Installer

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A Vortex Pro Internal Combi may be considered for:

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• Replacement of an existing internal oil combi

• Utility-room installations

• Homes with one main bathroom

• Properties requiring a self-contained heating appliance

• Projects where the cylinder is being removed

• Homeowners wanting to retain oil heating without stored hot water

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The final model should reflect both the calculated heating requirement and expected hot-water demand.

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Grant Vortex Pro External Combi

 

The Grant Vortex Pro External Combi provides heating and hot water from a weatherproof outdoor appliance.

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It is available in 21kW, 26kW and 36kW outputs and includes built-in frost protection, a factory-fitted multi-directional flue and a 24-litre expansion vessel.

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This range may suit:

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• Homes with limited internal space

• Properties already using an external oil boiler

• Utility-room conversion projects

• Rural homes with suitable external access

• Replacement of an older external oil combi

• Properties where boiler noise is better located outside

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An external combi can release valuable space inside, but the installation must still provide suitable access to the boiler and nearby pipework.

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Long hot-water pipe runs should be avoided where possible because they can increase the time taken for hot water to reach taps and may waste water and heat.

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Choosing a Grant Oil Combi Boiler

 

The three current Vortex Pro combi outputs provide options for different levels of heating and hot-water demand.

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Grant combi model General consideration

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21kW Smaller homes with modest heating and hot-water needs

26kW Small to medium-sized homes and many direct replacements

36kW Larger heating loads or stronger hot-water requiremen

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These descriptions are broad indications rather than boiler-sizing calculations.

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The installer should consider:

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• Property heat loss

• Number and size of radiators

• Number of bathrooms

• Bath capacity

• Shower type

• Incoming water pressure

• Available mains-water flow

• Distance to hot-water outlets

• Simultaneous hot-water use

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A larger oil combi will not create better incoming water pressure. The boiler can only deliver the water reaching the property.

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Where a large household regularly uses several showers or taps, a heat-only or system-type oil boiler with an appropriately sized hot-water cylinder may provide a better result.

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Grant Vortex Eco Boilers

 

The Grant Vortex Eco range provides a more accessible alternative to the Vortex Pro products.

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Current Eco options include external floor-standing boilers and internal or external wall-hung models. Qualifying Vortex Eco installations can receive a five-year G1 guarantee, compared with up to ten years for eligible Vortex Pro installations.

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The Eco range may be considered where:

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• A straightforward replacement is required

• The property has a smaller or medium heating load

• A wall-mounted boiler is preferred

• A competitively priced Grant boiler is required

• The longer Vortex Pro guarantee is not essential

• An external installation would release indoor space

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The installer should compare the installed cost, specification, guarantee and expected lifespan rather than selecting solely on the boiler’s purchase price.

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Grant Vortex Eco External Boilers

 

The Grant Vortex Eco External range is available in output bands of approximately:

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• 15–21kW

• 21–26kW

• 26–35kW

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Open-vented and sealed-system versions are available. Current features include a weather-resistant casing, built-in frost protection, quiet operation and a factory-fitted multi-directional flue.

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This range may suit:

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• Smaller and medium-sized homes

• Properties requiring an outdoor boiler

• Direct replacement of an older external oil boiler

• Open-vented heating systems

• Sealed heating systems

• Projects where internal space is restricted

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The selectable output bands allow the installer to commission the boiler within an appropriate range, subject to the manufacturer’s instructions and the property’s calculated heating load.

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Grant Internal Wall-Hung Oil Boilers

 

Grant Vortex Eco Internal Wall Hung boilers provide an option where a floor-standing boiler cannot easily be accommodated.

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The current internal wall-hung range includes two models covering approximately 16kW to 21kW, with open-vented and sealed-system variants available.

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These boilers may suit:

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• Smaller homes

• Utility rooms with limited floor space

• Replacement of an existing wall-hung oil boiler

• Properties where the boiler must be raised

• Projects needing a relatively compact oil boiler

• Open-vented or sealed systems

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The supporting wall and fixings must be suitable for the appliance. Oil boilers are generally heavier than comparable wall-mounted gas boilers, so structural support and installation requirements must be checked carefully.

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Grant External Wall-Hung Oil Boilers

 

The Vortex Eco External Wall Hung range provides an outdoor wall-mounted option with outputs of approximately 16–21kW.

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The boilers have a weather-resistant casing, factory-fitted multi-directional flue and open-vented or sealed-system variants.

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An external wall-hung boiler may be considered where:

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• Outdoor floor space is limited

• Internal space is unavailable

• The property has a relatively modest heat requirement

• Wall mounting improves access

• A floor-standing external boiler would obstruct a path or garden area

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The installer must confirm that the wall construction, brackets and fixings are capable of safely supporting the boiler.

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Grant Boiler House Boilers

 

Grant Vortex Boiler House models are intended for installation in garages, cellars, plant rooms and dedicated boiler-house spaces.

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The current range includes outputs from approximately 15kW to 70kW and uses the stainless-steel heat-exchanger technology found elsewhere within the Vortex range.

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A Grant Boiler House model may suit:

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• Larger rural homes

• Farmhouses

• Properties with dedicated plant rooms

• Garages and outbuildings

• Existing boiler-house installations

• Systems with substantial radiator requirements

• Projects where the boiler does not need a decorative casing

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Qualifying installations completed through a Grant G1 Installer can receive a five-year guarantee.

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Grant Boiler Prices

 

Grant boiler prices vary according to the model, output, installation format and supplier.

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Current market guidance places oil-boiler units broadly between approximately £1,800 and £4,000, with complete replacement

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installations commonly ranging from around £3,500 to £5,500. More complex work can cost £7,500 or more, particularly where the boiler is relocated or the oil tank requires replacement.

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A current retailer listing shows a Grant Vortex Eco floor-standing boiler at approximately £2,440 including VAT, illustrating that the appliance alone can represent a significant proportion of the project cost. Retail prices change regularly and may exclude the flue, controls and installation materials.

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The following figures provide broad planning allowances rather than fixed APN quotations:

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Grant boiler installation   /   Indicative installed cost

Straight forward internal oil-boiler replacement £3,500–£5,500

External Grant boiler replacement £4,000–£6,000

Grant oil combi boiler replacement £4,000–£6,500

Larger Vortex Pro installation £4,500–£7,000+

Boiler relocation £5,000–£8,000+

New boiler and oil tank £6,000–£10,000+

Traditional system converted to oil combi £5,000–£8,000+

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A general UK cost guide currently places the average supply-and-installation price of an oil combi boiler at approximately £4,000, although the actual cost varies significantly by property and installation scope.

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What Affects Grant Boiler Prices?

 

The Grant boiler itself is only one element of the complete installation cost.

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The final price can be affected by:

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• Vortex Pro or Vortex Eco range

• Heat-only, sealed-system or combi arrangement

• Internal or external installation

• Boiler output

• Flue type and route

• Existing boiler position

• Proposed new location

• Condensate drainage

• Oil-tank condition

• Oil-line replacement

• Fire-valve requirements

• Electrical work

• Heating controls

• System cleaning or flushing

• Magnetic or system filtration

• Radiator replacement

• Hot-water cylinder replacement

• Removal of tanks or cylinder

• External base or support work

• Wall mounting and structural support

• Making good and decoration

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An advertised Grant boiler price may cover only the appliance or a defined like-for-like replacement.

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The written quotation should state whether it includes:

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• Boiler

• Burner

• Flue components

• Controls

• Oil-line work

• Electrical connections

• System cleaning

• Commissioning

• Certification

• Disposal of the old boiler

• VAT

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Oil Tank and Fuel-Supply Assessment

 

Installing a new Grant oil boiler should include an assessment of the oil-storage and fuel-supply arrangements.

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The technician may need to examine:

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• Age and condition of the oil tank

• Evidence of cracking, corrosion or distortion

• Tank support and base

• Tank location

• Clearance from structures and boundaries

• Protection from fire

• Bunding requirements

• Oil-line condition

• Isolation valves

• Filter condition

• Fire valve

• Underground oil pipes

• Signs of leakage

• Access for fuel deliveries

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An ageing or non-compliant tank can significantly affect the cost of a boiler-replacement project.

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The tank should not be assumed to be satisfactory simply because it has continued to hold oil. OFTEC recommends using appropriately trained technicians and having oil-heating equipment and storage arrangements properly inspected.

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Replacing an Existing Grant Oil Boiler

 

A straightforward Grant boiler replacement normally involves installing the new appliance in approximately the same position and retaining the existing heating arrangement.

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Even with a direct replacement, the installer should inspect:

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• Existing boiler output

• Flue position

• Oil supply

• Oil tank

• Condensate drainage

• Heating flow and return pipes

• Circulation pump

• Radiators and valves

• Hot-water cylinder

• Expansion arrangements

• Electrical supply

• Heating controls

• System-water condition

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An older heating system may contain corrosion, sludge, damaged valves or poorly balanced radiators.

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Installing a new boiler without addressing these issues can restrict circulation and prevent the new appliance from operating as effectively as expected.

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Replacing a Different Oil-Boiler Brand With Grant

 

An existing Worcester, Firebird, Warmflow, Trianco or other oil boiler can normally be replaced with a Grant boiler, provided the selected model suits the property and installation.

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The installer should compare:

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• Physical dimensions

• Flow and return positions

• Flue requirements

• Boiler output

• Oil-line position

• Electrical connections

• Condensate requirements

• Hot-water arrangement

• Available guarantee

• Servicing access

• Total installed cost

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Selecting the boiler with the closest physical dimensions may reduce alterations, but suitability for the heating system should remain the main consideration.

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Converting to a Grant Oil Combi Boiler

 

Homeowners with a heat-only oil boiler, hot-water cylinder and storage tanks may want to convert to a Grant oil combi boiler.

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This can release cupboard or loft space and remove the need to schedule a hot-water cylinder. However, it involves more work than a straightforward boiler replacement.

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The conversion may require:

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• Removal of the existing boiler

• Disconnection of the hot-water cylinder

• Removal or abandonment of storage tanks

• New hot and cold-water connections

• Heating flow-and-return alterations

• Changes to the oil line

• Revised flue arrangements

• Condensate drainage

• Electrical alterations

• New heating controls

• System cleaning

• Making good

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The incoming mains-water pressure and flow should be tested before the cylinder and tanks are removed.

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Where the property has several bathrooms or high simultaneous demand, retaining a hot-water cylinder may offer better performance than an oil combi.

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Choosing the Correct Grant Boiler Output

 

The boiler output should not be chosen solely from the number of bedrooms.

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The installer should consider:

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• Floor area

• Property construction

• Wall insulation

• Roof insulation

• Floor insulation

• Window sizes and glazing

• Air leakage

• Number and size of radiators

• Underfloor heating

• Hot-water demand

• Cylinder recovery requirements

• Planned extensions or loft conversions

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Grant’s oil-boiler range extends up to approximately 70kW, but most typical homes will require considerably less than the maximum available output.

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An oversized boiler can cycle unnecessarily, while an undersized boiler may struggle to heat the property or recover the hot-water cylinder during cold weather.

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A heat-loss calculation provides a more reliable basis for selection than simply matching the rating on an older boiler.

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Internal or External Grant Boiler?

 

Both internal and external Grant boilers can provide effective heating when correctly installed.

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An Internal Boiler May Be Better When:

• A utility or plant space is available

• Short pipe runs are possible

• The boiler is protected from outdoor conditions

• Indoor servicing access is preferred

• The existing boiler is already internal

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An External Boiler May Be Better When:

• Internal space is valuable

• The existing boiler is outside

• Noise within the home is a concern

• The flue route is more practical externally

• A utility room is being converted

• Outdoor access is straightforward

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The decision should account for installation costs, pipe runs, weather protection, servicing access and the appearance of the property.

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Grant Boiler Efficiency

Current Grant Vortex oil boilers are high-efficiency condensing appliances.

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Published space-heating efficiencies vary by model. The Vortex Pro combi ranges achieve approximately 90.8% to 94.5%, while current Vortex Eco external models achieve approximately 91.7% to 92.7%.

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Actual household fuel consumption will also depend on:

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• Property insulation

• Thermostat settings

• Heating times

• Outdoor temperature

• Boiler sizing

• Heating controls

• Radiator balancing

• System-water condition

• Hot-water usage

• Oil quality

• Annual servicing

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Replacing an old non-condensing oil boiler may improve efficiency, but the greatest benefit is normally achieved when the boiler replacement is combined with effective controls and improvements to the wider heating system.

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Biofuel and HVO Compatibility

 

Selected Grant Vortex Pro boilers are compatible with certain biofuel blends, depending on the fuel type, blend percentage and installation conditions.

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Homeowners should not change the fuel used by an existing boiler without professional advice.

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The installer or service technician should confirm:

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• Whether the exact boiler model is compatible

• Required burner adjustments

• Suitability of seals and components

• Oil-tank compatibility

• Fuel-line compatibility

• Fuel availability

• Manufacturer guarantee implications

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Compatibility does not necessarily mean that alternative liquid fuels are readily available or economically suitable in every location.

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Grant Heating Controls

 

Modern heating controls can improve comfort and reduce unnecessary boiler operation.

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Depending on the heating arrangement, the installation may include:

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• Programmable room thermostat

• Wireless thermostat

• Smart heating control

• Weather compensation

• Thermostatic radiator valves

• Separate upstairs and downstairs zones

• Cylinder thermostat

• Hot-water scheduling

• Underfloor-heating controls

• Frost protection for external installations

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The controls should be designed alongside the boiler rather than selected after the installation has been completed.

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A larger rural home may benefit from separate heating zones so that bedrooms, living spaces and less frequently used areas can be controlled independently.

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Grant Boiler Guarantees

 

Grant oil boilers have a standard guarantee that can be extended when the appliance is installed and registered by an eligible Grant G1 Installer.

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Current Grant information indicates:

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• Vortex Pro Internal, External and Combi boilers: up to ten years through a qualifying G1 installation

• Vortex Eco boilers: up to five years through a qualifying G1 installation

• Boiler House models: up to five years through a qualifying G1 installation

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The standard guarantee is generally two years when the boiler is registered within the required period, while extended cover depends on the installer, product and compliance with Grant’s terms.

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Homeowners should ask the installer to confirm:

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• Exact guarantee period

• Whether the installer is a Grant G1 Installer

• Who will register the boiler

• Registration deadline

• Annual servicing requirements

• Whether system protection is required

• What documentation must be retained

• What is excluded

• Who will attend in the event of a fault

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The quotation should state the actual guarantee applying to the selected boiler rather than simply referring to cover of “up to ten years.”

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Use an Appropriately Qualified Oil-Heating Technician

 

Oil boilers are not covered simply by choosing a Gas Safe registered gas engineer.

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Homeowners should use a technician who is appropriately trained and assessed for oil-fired heating work. OFTEC operates a competent-person register for technicians working on oil heating, storage tanks and related systems.

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An OFTEC-registered technician can self-certify applicable work through the competent-person scheme and arrange the relevant Building Regulations compliance certificate.

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Following installation, the homeowner should normally receive:

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• Boiler commissioning record

• Building Regulations compliance certificate

• Grant guarantee confirmation

• Boiler instructions

• Heating-control instructions

• Oil-tank and fuel-line information

• Service requirements

• Itemised invoice

• Relevant electrical certification

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The compliance certificate should be retained with the property records.

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What Should a Grant Boiler Quote Include?

 

A complete quotation should identify:

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• Exact Grant boiler range

• Exact model

• Boiler output

• Internal or external installation

• Heat-only, sealed-system or combi arrangement

• Proposed boiler location

• Flue arrangement

• Condensate drainage

• Oil-tank assessment

• Oil-line work

• Fire-valve provision

• Heating controls

• System cleaning

• Chemical inhibitor

• System filter

• Electrical work

• Removal of the existing boiler

• Removal of tanks or cylinder

• External base or wall supports

• Making good

• Guarantee period

• Commissioning

• Building Regulations notification

• VAT

• Exclusions

• Potential additional costs

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​This makes it easier to compare quotations on a like-for-like basis.

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A lower quote may exclude oil-line replacement, controls, system cleaning, electrical work or repairs to an ageing oil tank.

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Is There an Oil Combi Boiler Grant?

 

The phrase “oil combi boiler grant” can refer to either a Grant-brand oil combi boiler or financial help towards installing an oil boiler.

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The national Boiler Upgrade Scheme does not provide funding for the installation of a replacement oil combi boiler. It provides support towards eligible low-carbon heating systems such as heat pumps and, in limited circumstances, biomass boilers.

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As of 17 July 2026, the standard Boiler Upgrade Scheme contribution is up to £7,500 for qualifying air-to-water and ground-source heat pumps.

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From 21 July 2026, eligible off-gas-grid properties in England and Wales can receive up to £9,000 towards a qualifying air-to-water or ground-source heat pump installation. The higher amount is intended particularly for properties currently reliant on heating oil or other off-grid fuels.

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The scheme requires the existing fossil-fuel heating system to be replaced. It is not a grant towards buying another Grant oil boiler.

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Other local authority or household-support schemes may occasionally include heating repairs or replacement assistance, but availability depends on location, household circumstances and current funding.

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Frequently Asked Questions

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Are Grant boilers good oil boilers?

Grant manufactures a broad range of condensing oil boilers, including internal, external, wall-hung, boiler-house and combi models. The Vortex range uses stainless-steel heat-exchanger technology and includes guarantees of up to ten years on qualifying installations.

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How much does a Grant boiler cost?

The boiler unit may cost approximately £1,800 to £4,000, depending on the model and output. A complete Grant oil-boiler installation will commonly cost between approximately £3,500 and £7,500, with relocation or oil-tank replacement increasing the price.

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Which Grant oil boiler do I need?

The correct boiler depends on the property’s calculated heat loss, hot-water arrangement, available installation space, existing system, oil tank, flue route and required output.

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Does Grant make oil combi boilers?

Yes. Grant Vortex Pro Internal and External Combi boilers are currently available in 21kW, 26kW and 36kW outputs.

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What is the Grant Vortex Pro Combi XS?

The Combi XS is a compact 26kW internal oil combi boiler measuring approximately 515mm wide. It can be useful when replacing an older oil combi in a restricted space.

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Can a Grant oil combi supply two bathrooms?

The larger models can provide substantial hot-water performance, but suitability depends on the incoming water pressure, flow rate and simultaneous demand. A cylinder-based system may be better for homes regularly using several bathrooms.

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Can a Grant boiler be installed outside?

Yes. Grant manufactures external Vortex Pro, Vortex Eco and external combi boilers with weather-resistant casings and frost protection.

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Does Grant make wall-mounted oil boilers?

Yes. Grant offers internal and external Vortex Eco wall-hung oil boilers for properties where floor space is limited.

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How long is a Grant boiler guarantee?

Vortex Pro oil boilers can qualify for guarantees of up to ten years when installed and registered by an eligible Grant G1 Installer. Vortex Eco and Boiler House models can qualify for up to five years. Terms and annual servicing requirements apply.

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Does a Grant oil boiler need annual servicing?

Yes. Annual servicing is important for safe operation, combustion efficiency, reliability and maintaining the manufacturer’s guarantee.

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Do I need an OFTEC-registered installer?

An OFTEC-registered technician has been trained and assessed for relevant oil-heating work and can self-certify applicable installations through the competent-person scheme. Homeowners should verify that the technician holds the correct category of oil qualification.

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Can I receive a government grant for a new Grant oil boiler?

The national Boiler Upgrade Scheme does not fund replacement fossil-fuel boilers. It supports eligible heat pumps and limited biomass installations. From 21 July 2026, qualifying off-gas-grid properties may receive up to £9,000 towards an eligible heat pump.

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Find the Right Grant Boiler for Your Home

 

Choosing the right Grant boiler starts with understanding the property, the existing oil-heating system and the amount of heating and hot water the household requires. APN Boilers can connect you with experienced local oil-heating professionals who can assess the boiler, oil tank, fuel line, radiators and controls, recommend a suitable Grant Vortex boiler and provide a clear quotation for the complete installation.

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Tell us about your property and existing heating system to take the next step towards a warmer, more efficient and dependable home.