Dometic ProHeat Fuel Filter
The Dometic ProHeat 880035K Fuel Filter is a factory replacement service component used in several ProHeat diesel-fired coolant heater families.
The filter removes contaminants from the heater’s fuel supply before fuel reaches critical fuel-system and combustion components. Maintaining a clean fuel filter helps support consistent fuel delivery, reliable ignition, and proper heater performance.
ProHeat documents 880035K for the:
- ProHeat X45
- ProHeat X45 Plus
- ProHeat M-Series
The current M-Series parts catalog lists 880035K as the standard fuel filter across the M-Series heater models covered by the catalog.
Key Features
- Genuine Dometic ProHeat replacement component
- Factory part number 880035K
- Used in multiple ProHeat coolant heater families
- Helps prevent fuel-system contamination
- Supports consistent fuel delivery
- Routine service and maintenance component
- Used in factory ProHeat X45 service kits
- X45/X45 Plus documentation specifies two O-rings included
Heater Applications
ProHeat X45
The X45 parts catalog identifies 880035K as the fuel filter in the heater’s air compressor, fuel pump, and coolant pump assembly. ProHeat specifies that the filter is supplied with the associated fuel-filter and fuel-fitting O-rings.
ProHeat X45 Plus
The X45 Plus uses the same 880035K fuel filter. It is also included in the factory Fall Tune-Up Kit and Major Service Kit.
ProHeat M-Series
ProHeat also specifies 880035K as the fuel filter for its M-Series heaters. Current factory documentation identifies the filter as standard on the M-Series models covered by the parts catalog, including:
- M50
- M80
- M90
- M105
- M125
ProHeat documentation also confirms use of 880035K in earlier M-Series configurations.
Helps Protect the Fuel System
Clean fuel is important for reliable auxiliary heater operation.
The 880035K filter helps prevent debris from reaching components such as the:
- Fuel pump
- Fuel regulator
- Fuel nozzle
- Fuel delivery system
- Combustion system
A contaminated or restricted fuel filter can reduce proper fuel delivery and should be inspected as part of regular heater maintenance or when troubleshooting fuel-related performance problems.
Included O-Rings
For X45 and X45 Plus applications, ProHeat identifies 880035K as supplied with two O-rings.
The factory X45/X45 Plus parts diagrams identify these as:
- 014925K – Fuel Filter O-Ring
- 014427K – Fuel Fitting O-Ring
ProHeat also lists 880035K as “Filter, Fuel c/w 2 O-Rings” in the factory X45 service-kit documentation.
Factory X45 Service Kit Component
The 880035K fuel filter is included in two factory ProHeat X45/X45 Plus maintenance kits.
PK0094 – X45 Fall Tune-Up Kit
Includes:
- 880035K – Fuel Filter with two O-rings
- 825730K – Compressor Air Filter
- Fall tune-up instructions
PK0069 – X45 Major Service Kit
Includes:
- 880035K – Fuel Filter with two O-rings
- 825730K – Compressor Air Filter
- 951126K – Fuel Regulator
- 930523K – Ignition Lead
- 954329K – Flame Sensor
- 938326K – Fuel Nozzle
- 933525K – Igniter
- Service instructions
ProHeat’s inclusion of the filter in both service kits makes it an important routine-maintenance component for the X45 platform.
Installation and Maintenance Notes
When replacing the fuel filter:
- Shut the heater down completely before service
- Disconnect electrical power where required
- Avoid open flames, sparks, or smoking around diesel fuel
- Prevent dirt from entering open fuel-system connections
- Replace the supplied sealing O-rings where applicable
- Inspect surrounding fuel fittings and lines for leaks or damage
- Check all connections for leaks after service
- Confirm proper heater operation before returning the unit to service
A restricted fuel filter can contribute to fuel-delivery or combustion problems. Inspect the filter when diagnosing heater performance issues before replacing larger fuel-system components.
Product Specifications
- BTRAC SKU: PH-880035K
- Manufacturer: Dometic ProHeat
- Manufacturer Part Number: 880035K
- Product Type: Fuel Filter
- ProHeat X45: Yes
- ProHeat X45 Plus: Yes
- ProHeat M-Series: Yes
- M-Series Models Documented: M50, M80, M90, M105, M125
- System: Fuel delivery
- Service Type: Routine maintenance / replacement
- O-Rings: Two specified with X45/X45 Plus replacement filter
Related ProHeat Parts
- PH-825730K – X45/X45 Plus Compressor Air Filter
- PH-014925K – Fuel Filter O-Ring
- 014427K – Fuel Fitting O-Ring
- PK0094 – X45 Fall Tune-Up Kit
- PK0069 – X45 Major Service Kit
- PH-951126K – X45 Fuel Regulator
Weight & Dimensions
Dometic/ProHeat does not publish verified packaged shipping weight or dimensions for 880035K in the factory parts documentation.
For WooCommerce shipping, use the actual packaged dimensions and weight of the BTRAC-stocked part.
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