How Much Does a Campervan Diesel Heater Cost to Install?

A professionally installed campervan diesel heater can cost anywhere from approximately £600 for a straightforward installation using a suitable lower-cost heater to more than £2,000 for a premium branded system or complex motorhome installation.

At WeConvert, diesel heater installation labour starts from £399. The heater itself and the installation materials are charged separately because the final cost depends on the heater brand, vehicle, fuel connection, mounting position, ducting and existing electrical system.

As a broad budgeting guide:

These are general planning ranges rather than fixed package prices. A quotation can only be confirmed once the vehicle, heater and proposed installation arrangement have been assessed.

What Is Included in a Diesel Heater Installation?

A diesel air heater is not simply placed inside the van and connected to a battery.

A complete installation normally requires:

• The diesel heater
• A suitable mounting plate or enclosure
• Hot-air ducting
• At least one warm-air outlet
• A return-air route
• A heater controller
• Appropriately sized electrical cabling
• Fuse protection
• Fuel pipe
• A fuel-metering pump
• A main-tank fuel pickup or dedicated auxiliary tank
• Combustion-air intake pipework
• Exhaust pipework
• Exhaust silencer where appropriate
• Heat protection where required
• Suitable fixings, clamps and seals
• Testing and commissioning

The installation also needs to be planned around furniture, flooring, insulation, existing wiring, water tanks and other systems already fitted to the vehicle.

This is why a heater costing £150 online does not result in a £150 completed heating system.

Why Do Diesel Heater Installation Prices Vary So Much?

Two quotes described as “diesel heater supplied and fitted” may cover very different equipment and installation methods.

The main factors affecting the final price are explained below.

1. The Brand of Diesel Heater

The heater itself is one of the largest parts of the overall cost.

There are three broad categories.

Lower cost diesel heaters

Lower cost heaters can provide effective heating when the unit is suitable and the installation is completed correctly.

They are attractive to customers working with a limited budget, but there can be differences in:

• Component quality
• Instructions and documentation
• Controller operation
• Fuel-pump noise
• Parts availability
• Manufacturer support
• Warranty arrangements
• Long-term repair options

A low purchase price does not remove the need for proper fuel lines, electrical protection, mounting, intake, exhaust and ducting.

In some cases, parts supplied with a low-cost heater kit may need replacing with more suitable installation components.

AUTOTERM diesel heaters

AUTOTERM heaters are a popular middle ground option for campervans.

They generally cost more than unbranded heaters but offer established product support, available replacement parts and recognised heater models such as the AUTOTERM Air 2D and Air 4D.

A complete AUTOTERM installation will normally cost more than a budget installation because the heater kit itself represents a larger part of the quotation.

Webasto and Eberspächer diesel heaters

Webasto and Eberspächer are established vehicle-heating manufacturers with recognised dealer and parts networks.

These systems normally carry the highest upfront cost, particularly once the controller, vehicle specific installation kit, ducting and professional fitting are included.

They may be suitable for customers who prioritise:

• Established manufacturer support
• Replacement-parts availability
• Diagnostic capability
• Product documentation
• Long-term serviceability
• A recognised heater brand

The most expensive heater is not automatically necessary for every campervan, but it is important to understand what you are receiving when comparing quotations.

2. Whether You Supply the Heater

You may already have purchased a heater and only require installation.

WeConvert can consider installing a customer-supplied heater, provided that it is:

• Suitable for the vehicle and intended use
• The correct voltage
• Complete
• Undamaged
• Supplied with suitable instructions
• Supported by appropriate installation components
• Capable of being installed in a suitable location

We reserve the right to decline unsuitable equipment or an installation that cannot be completed properly.

Supplying your own heater can reduce the initial quotation, but it does not necessarily reduce the labour involved. The same planning, mounting, fuel, electrical, intake, exhaust and commissioning work is still required.

Additional costs may also arise if components from the supplied kit need replacing.

3. The Heater Size

Campervan diesel air heaters commonly fall into approximately 2kW and 4kW output categories, although other sizes are available.

A 4kW heater will generally cost more than a 2kW equivalent, but the price difference between heater sizes is not always the most important factor.

The correct output depends on:

• Van size
• Roof height
• Insulation
• Number and size of windows
• Intended travel season
• Expected outside temperatures
• Internal layout
• Duct length
• Number of outlets

Installing a larger heater simply because it has more output is not always the right decision. An oversized heater may spend too much time operating at a low setting, while an undersized heater may struggle to warm a large or poorly insulated vehicle.

Our 2kW vs 4kW diesel heater guide explains this in more detail.

4. Where the Heater Is Installed

The heater position has a major effect on installation cost.

Possible locations include:

• Under a driver or passenger seat
• Inside a suitable seat box
• Under a fixed bed
• Within a rear garage
• Inside purpose-built furniture
• Beneath the vehicle
• Inside an existing heater compartment

A straightforward internal installation with good access will normally cost less than a difficult underslung installation requiring a protective enclosure, specialist brackets or longer service runs.

The chosen position must allow suitable routing for:

• Warm-air ducting
• Combustion-air intake
• Exhaust
• Fuel pipe
• Electrical cabling
• Service access

It must also protect the heater from stored equipment, water, road debris and accidental obstruction.

We will not recommend a position simply because it is the quickest or cheapest option if the heater cannot be mounted and routed appropriately there.

5. Main Fuel Tank or Separate Heater Tank

A diesel heater can normally be supplied from either the vehicle’s main fuel tank or a properly installed auxiliary tank.

Connecting to the vehicle fuel tank

Using the main tank is convenient because there is no separate heater tank to refill.

However, the cost depends on the vehicle and the access available. The work may require:

• Accessing the existing tank sender
• Installing an appropriate fuel pickup
• Lowering or partially lowering the fuel tank
• Routing the fuel line along the vehicle
• Protecting the line from damage
• Avoiding unsuitable connections to existing engine fuel lines

Some vehicles provide relatively straightforward access. Others require significantly more labour.

Using a dedicated auxiliary tank

A separate tank may be appropriate where a main-tank connection is not practical.

The tank still needs to be:

• Securely mounted
• Properly vented where required
• Accessible for filling
• Protected from damage
• Connected using suitable fuel line and fittings

A loose temporary fuel container is not an acceptable long-term installation.

The cheapest fuel arrangement is therefore not always the most convenient or appropriate one.

6. Internal or External Mounting

An internally mounted heater may be less exposed to water and road debris, but it occupies valuable space and needs to be protected from stored items.

An externally mounted heater preserves interior storage but may require:

• A weather-resistant enclosure
• Additional brackets
• Corrosion-resistant fixings
• Longer cable and fuel runs
• More complex ducting
• Additional heat protection
• Greater installation time

External installations are therefore often more expensive than straightforward internal installations.

The heater manufacturer’s installation requirements must also permit the proposed mounting arrangement.

7. The Number of Warm-Air Outlets

A simple heater system may use one warm-air outlet directed into the main living space.

Larger campervans and motorhomes may require heat to reach:

• The front seating area
• Rear sleeping area
• Washroom
• Garage
• Raised bed
• Separate living areas

Each additional outlet can require more ducting, connectors, vents and installation time.

Ducting cannot simply be added without considering airflow. Excessively long, narrow or sharply bent ductwork can restrict the heater and reduce performance.

A well-positioned single outlet can sometimes perform better than a poorly designed system with several outlets.

8. The Existing Electrical System

A diesel heater uses the most electrical power during startup and shutdown.

It therefore needs a stable supply from a suitable leisure battery system.

Additional work may be required if the existing installation has:

• An old or weak leisure battery
• Undersized supply cables
• Excessive voltage drop
• Poor fuse protection
• Damaged wiring
• Loose connections
• No suitable spare circuit
• An unreliable earth connection
• Insufficient charging capacity

A heater may appear to be faulty when the real problem is that its voltage falls too low during startup.

Where the existing system is unsuitable, we may recommend electrical corrections before or alongside the heater installation.

Learn more about our campervan electrical and solar installation service.

9. The Floor Construction

Installing a diesel heater normally requires openings through the vehicle floor for the combustion intake, exhaust, fuel connection and heater mounting arrangement.

The work may be more complicated where the van has:

• A thick insulated floor
• Multiple flooring layers
• Underfloor water tanks
• Existing wiring beneath the floor
• Pipework close to the proposed position
• Chassis members or structural obstructions
• Limited access beneath the vehicle

A suitable mounting turret or raised mounting plate may be required where the finished floor is particularly deep.

The underside of the floor must always be checked before any openings are made.

10. Replacement and Rectification Work

Replacing an existing heater is not always cheaper than installing a new one.

A direct replacement may be straightforward where the new heater is compatible with the existing:

• Mounting position
• Ducting
• Fuel system
• Wiring
• Controller
• Intake and exhaust

However, additional work may be required where the existing system has:

• An unsafe exhaust route
• Damaged fuel lines
• Poor wiring
• Incorrect fusing
• Inadequate ducting
• Corroded components
• An unsuitable mounting position
• Holes that need repairing
• A different heater footprint
• Components that are not compatible with the replacement heater

We may need to remove or correct previous work before the new heater can be installed.

If your existing heater will not start, replacement should not automatically be the first step. Visit our campervan and motorhome repairs and fault-finding page for information about heater diagnosis.

What Does WeConvert Charge for Installation?

Our diesel heater installation labour starts from £399.

This starting price applies to suitable, relatively straightforward installations. It does not include the heater or installation materials.

The final quotation will depend on:

• Vehicle make, model and year
• Campervan or motorhome layout
• Heater brand and output
• Proposed heater position
• Internal or external mounting
• Main-tank or auxiliary fuel supply
• Number and length of air ducts
• Controller position
• Existing electrical supply
• Floor and underbody access
• Any furniture alterations
• Removal of an old heater
• Correction of previous installation work

We provide a written quotation once we understand the agreed installation.

Is Professional Diesel-Heater Installation Worth the Cost?

A diesel heater brings fuel, combustion air, exhaust gases, electricity and high temperatures together inside or beneath a vehicle.

A professional installation should consider the entire system rather than concentrating only on whether the heater switches on.

Important considerations include:

• Exhaust gases entering through doors, windows or vents
• Fuel-line security
• Appropriate fuse protection
• Cable voltage drop
• Heater shutdown requirements
• Hot-air restrictions
• Clearance from heat-sensitive materials
• Protection from stored items
• Underbody heat and road exposure
• Future access for servicing

An incorrectly installed heater may still appear to work initially.

Problems can emerge later as loose fittings, damaged cables, restricted ducts, water exposure or carbon accumulation begin to affect the system.

Professional fitting also gives you a clear point of contact if you need help with the installation after the vehicle has been returned.

How Can You Keep the Installation Cost Down?

There are sensible ways to control the cost without compromising the installation.

Choose the correct heater

Do not automatically purchase the largest or most expensive unit.

The heater should be chosen around the van and how it will be used.

Contact the installer before buying

Buying a heater first can limit the available installation options.

Discussing the vehicle before ordering allows the heater, controller and kit to be checked for suitability.

Provide clear photographs

Useful photographs can include:

• The proposed heater area
• The floor beneath the position
• The leisure battery
• Existing fuse boards
• The vehicle fuel tank area
• Nearby furniture
• The intended warm-air outlet
• Any existing heater installation

Photographs will not always be enough for a final quotation, but they help identify likely complications.

Keep the ducting simple

A carefully selected heater position with one effective outlet is often better than a complicated network of long ducts.

Make the area accessible

Removing loose possessions and providing access to furniture, batteries and floor areas can reduce avoidable workshop time.

Correct other problems at the same time

Where the van already needs electrical corrections or furniture alterations, completing related work during the same booking may be more efficient than returning for several separate appointments.

What Information Is Needed for a Quote?

To price a diesel-heater installation, we will normally ask for:

• Vehicle make
• Vehicle model
• Vehicle year
• Wheelbase and roof height
• Whether it is a campervan, motorhome or self-build
• Current stage of the conversion
• Heater already purchased, if applicable
• Preferred heater brand
• Intended mounting location
• Main fuel tank or auxiliary tank preference
• Number of warm-air outlets required
• Details of the leisure battery system
• Your postcode
• Relevant photographs

We may also need to inspect the vehicle before confirming a fixed price.

Diesel-Heater Installation in Blackburn and Lancashire

WeConvert provides campervan and motorhome diesel-heater installation from our workshop in Blackburn.

We work with customers from:

• Blackburn
• Darwen
• Accrington
• Burnley
• Rossendale
• Bolton
• Chorley
• Preston
• Wider Lancashire
• The surrounding North West

We can consider new installations, replacement heaters, upgrades and faults involving suitable existing systems.

Frequently Asked Questions

How much does it cost to fit a diesel heater to a campervan?

Installation labour at WeConvert starts from £399, with the heater and installation materials charged separately.

A complete system may cost from approximately £600 for a straightforward lower-cost installation to more than £2,000 for a premium branded or complex installation.

Can I provide my own diesel heater?

Potentially.

The heater must be complete, suitable for the vehicle and supplied with appropriate installation information. We may decline equipment that is damaged, incomplete or unsuitable.

Is an AUTOTERM cheaper than a Webasto or Eberspächer?

AUTOTERM systems will often fall between lower-cost heaters and premium Webasto or Eberspächer installations.

The final cost still depends on the controller, installation kit, fitting position, fuel connection and ducting.

Does a 4kW heater cost more to install than a 2kW heater?

The heater itself may cost more, but the installation labour can be similar where the mounting and associated components are comparable.

Vehicle size and installation complexity normally affect labour more than the output number alone.

Is it cheaper to use a separate diesel tank?

Sometimes, but not always.

A separate tank may avoid accessing the vehicle’s main tank, but it still requires secure mounting, suitable filling access and proper fuel-line installation.

Can you connect the heater to the van’s main fuel tank?

Often yes, subject to the vehicle design and a suitable fuel pickup arrangement.

The cost will depend on how easily the tank and sender can be accessed.

How long does installation take?

A straightforward installation may be completed within one workshop day.

Complex installations, replacements, furniture alterations or electrical corrections can take longer.

Can you repair my current diesel heater instead?

Possibly.

A heater that will not start may have a low-voltage supply, fuel-delivery problem, controller fault, installation issue or restricted intake or exhaust.

We can assess suitable existing installations before recommending replacement.

Request a Diesel-Heater Installation Quote

A diesel heater can make a campervan or motorhome much more practical during autumn, winter and colder overnight trips.

The final cost depends on much more than the advertised price of the heater, so the best starting point is to assess the vehicle and agree how the system should be installed.

To request a quotation, send us:

• Your vehicle make, model and year
• Photographs of the conversion
• Details of any heater already purchased
• Your preferred installation position
• Your postcode
• How and when you use the van

Diesel heater installation labour starts from £399, with the heater and materials charged separately.

Request a diesel-heater installation quote or contact WeConvert to discuss your vehicle.