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Eberspacher Airtronic D4 and D4S Plus to M3 D4L Heater Upgrade Kit 24v Heater and wiring conversion kit for to upgrade old version Eberspacher Espar D4 heater (252114 252498) to the latest Airtronic M3 D4L (252956) heater model. Whilst repair parts are still available for the D4, 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 using 24v the D4 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 4518 pump to new digital fuel dosing pump Certified for installation in passenger areas and in proximity to dangerous substances. PLEASE NOTE: 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. This kit includes: A Genuine Eberspacher Airtronic M3 D4L 24 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. 24 volt only Heater Applications Include Replacement Airtronic D4 heater & fuel pump 4kW power output through smaller ducting size Welfare Units Truck and Commercial Vehicles 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.