Eberspacher Airtronic D4S Plus to M2 D4R Heater Upgrade Changeover Kit 12V

Part Number: D4RUPGRADE
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Eberspacher Airtronic D4S Plus to M2 D4R Heater Upgrade Kit 12v

Heater and wiring conversion kit for to upgrade old version Eberspacher Espar D4S heater (252484) to the latest Airtronic M2 D4R (252746) heater model. The D4 Plus heater and pump have been a popular choice for diesel heating in Camper, Marine, RV, Ambulance and Welfare Unit installations because of its optimised fuel efficiency and capability to run a smaller 75mm ID ducting. Whilst repair parts are still available for the D4S, for fleet maintenance, where time is critical, a plug 'n' play  replacement heater unit can often prove the most effective solution to get a vehicle back on the road or a welfare unit back into hire. 

For Marine and RV applications the D4R conversion kit is a simple and effective way to upgrade your heating system to a new and improved version with minimal work keeping your current Airtronic, ducting, fuel line and controller installed.

Benefits of the included Airtronic upgrade harness:

  • No wiring required: Plug-n-play design utilizes the already installed wiring harness and controller
  • Essential for reducing downtime of Ambulance and Welfare fleets when replacement of older heater and pumps is required
  • Compatible with D2 D4 D5 Airtronic heaters using 801 and 802 modulators or the EasyStart Select
  • Diagnostic port for EasyScan included for heater testing and repair of Ax2 Ax3 models
  • Fuel pump adapter lead included for old 4519 pump to new digital fuel dosing pump

Certified for installation in passenger areas and in proximity to dangerous substances.


This heater upgrade kit is compatible with existing heater installation using EasyStart Select or EasyStart Timer. If your installation has a different controller version please also see suggested items for Easy Start controllers suitable for the D4R upgrade.

The M2 D4R heater from Eberspacher is designed to operate efficiently using ducting with a minimum internal dimension of 75mm. 90mm ID ducting may also be used. Excludes outlet hood. 75mm or 90mm outlet hood available dependent upon your requirements

This kit includes:

  • A Genuine Eberspacher Airtronic M2 D4 R 12 volt heater & fuel pump
  • Plug 'n' play heater adapter harness and fuel pump adapter
  • A comprehensive installation CD

This a genuine Eberspacher warranted heater with next day UK delivery available and also shipped internationally.

12 volt only

Heater Applications Include

  • Replacement Airtronic D4R heater & fuel pump
  • 4kW power output through smaller ducting size
  • Welfare Units
  • Vans and Small Buses
  • Caravans, Mobile Homes & RV's
  • Mobile Workshops
  • Electric Vehicles
  • Motorhome & Campervans
  • As a replacement heater in Marine applications where suitable marine components have been prior fitted.

If you are planning a new Boat installation with this heater package to ensure you have all the necessary components please contact our team

Customised Heater Kits

Bespoke vehicle heater kits and marine heater kits are available, or if you require any more accessories for this heater kit please contact Butler Technik with your requirements.

Historical Product Codes


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Please Note: Delivery prices quoted are excluding VAT.

Deliveries are made from Monday to Friday excluding Bank and National Holidays.

Next Working Day Shipping* is available in UK Mainland for all orders placed before 15:00hrs. Orders placed after 15:00hrs will be dispatched the following working day on a next day service.

Orders placed on a Saturday or Sunday will be despatched the following Monday (except Bank Holidays) for expected delivery following business day (Tuesday).

For Next Business Day Delivery, please select Next Day.

Standard 2-day shipping* is available to Scottish Highlands and Islands orders placed before 15:00hrs on stocked items. Items are despatched promptly sameday. UK Courier services are typically 2 day delivery for remote UK postcodes.

WEEKEND deliveries in the UK may be possible if required at additional cost. For WEEKEND delivery quotation please call our Sales Team prior*

Standard carriage / Free-shipping - please allow 2-5 working days from clearance of payment for delivery. Typically however delivery is much quicker and 98% of orders are delivered to UK addresses within 24 - 48 hours after dispatch from warehouse.

Delivery Times - Deliveries are made Monday to Friday (excl. public holidays) typically 2-5 working days from date of order for in-stock items if the FREE DELIVERY option is chosen. An email will be sent to inform you of dispatch of goods and due delivery date. Next Day UK delivery may be selected at checkout for an additional cost.

  • Free worldwide delivery will not be available if one of the following is applicable to your order:
  • Your order has a total weight exceeding 18kgs
  • You already have a discount code applied to your order
  • Your basket contains a special order item that requires shipping additionally.

Our returns policy does not include manufacturer warrantable items. Please speak to our support department or email sales@butlertechnik.com if you believe your item has failed within warrantable circumstances, or if you wish to return an item for refund.

Refunds and Right to Cancel

You have the right to cancel your order within a 14 (fourteen) day "cooling off period", which starts the day after you receive your items. You can apply for a refund within 30 (thirty) days from the date of invoice.

Prior Notification of Intent

If you wish to cancel an order or submit a refund request under the UK Consumer Protections (Distance Selling) Regulations 2000, you must inform ButlerBus Technik Ltd of your intention to cancel or return your order by either phone, email or post within the 14 (fourteen) day cooling off period for order cancellation, or 30 (thirty) day period for refunds.

When Butlerbus Technik has received your request you will receive confirmation and given authorisation to return goods. Please quote and include your original invoice number. All goods must be in a re-saleable condition.

You will be required to return goods at your cost by an insured and trackable method. If goods go missing we will only consider a request for refund on proof of completed receipt/delivery of goods to Butler Technik from your nominated courier. Once we have received goods we will then issue you a full refund less any delivery charges.

If you are unable to arrange a return please contact us. We can arrange collection on your behalf but a charge will be made which will be deducted from your refund total.

If a delivery charge was made on the original purchase this will not be refunded as this is a service which is concluded at the point of order.

Orders that have already been processed and/or dispatched cannot be cancelled; they must be returned to ButlerBus Technik Ltd for refund following receipt of goods by customer.

We will do our very best to assist and enable a quick refund process upon receipt of returned items.

Thank you for your continued understanding during this process

Returns address
ButlerBus Technik Ltd
Bridge Road
United Kingdom

    Specific Terms:
  • All costs relating to return shipping of correctly supplied goods shall be the responsibility of the purchaser.
  • ButlerBus Technik Ltd are not responsible for any shipping or insurance charges relating to return of goods.
  • Please be aware that ButlerBus Technik Ltd may NOT be able to accept for full or partial refund/credit any items that have been prior installed by the customer before return. Such goods/components shall be deemed 'used' and therefore unable for subsequent resale.
  • Specifically, but not exclusively, the return of prior installed electronic items used for purchaser diagnostic or trouble-shooting purposes shall not be considered for full refund.
  • The decision to refund or partially refund prior installed items shall remain solely at the discretion of ButlerBus Technik Ltd.
  • The decision to refund or partially refund goods returned beyond 30 days after original date of sale shall remain solely at the discretion of ButlerBus Technik Ltd.

Your statutory rights are unaffected by the above. Consumers other than Business trade customers are further protected by UK Consumer Protection (Distance Selling) Regulations 2000.

If you have any questions please ask our support department prior to returning any items.

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Eberspacher Airtronic D4S Plus to M2 D4R Heater Upgrade Changeover Kit 12V

£1,092.88 (ex. VAT)