Manuals & Resources
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We pride ourselves on providing high-quality products, support, and service for all of our customers. Whether you are a first-time customer or have been enjoying your PHP or major branded heater for years, we are here for you. Below, find an ever-growing list of how-to videos, product manuals, and updates on your favourite PHP and major branded heating products.
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Technical Sheets & Manuals
See below for the latest technical sheets, bulletins, and manuals for all of our PHP, Espar/Eberspaecher, and Webasto heaters.
Product Manuals - Air Heaters
- PH21A Air Heater - Manual (Rev08, May 2024)
- PH23A Air Heater - Technical Manual (March 2023)
- PH25AG Air Heater - Manual (2025 New, Rev00)
- PH25AG Air Heater - Manual (Sept 2024, Rev07)
- PH25AG Air Heater - Operating Switch Instructions (Rev00)
- PH25AG & PH55AG Air Heaters - Bluetooth Instructions (May 2025)
- PH41A Air Heater - Manual (Rev07, April 2025)
- PH55AG Air Heater - Manual (Jan 2025, Rev01)
- P65D-X389 Operator Switch - Operating Switch Instructions (DR02)
Product Manuals - Coolant Heaters
- PH51W Coolant Heater with E-Connect - Manual (Rev00)
- PH51W Coolant Heater - Manual (May 2024, Rev05)
- PH51W Coolant Heater - Timer Operation and Fault Codes
- PH53W Coolant Heater - Manual (May 2024, Rev03)
- PH52W Coolant Heater - Manual (Jan 2023, Rev8)
Wiring Diagrams
- PH51W with E-Connect - Wiring Diagram
- PH51W - Wiring Diagram (Rev2, Nov 2022)
Parts Catalog
Sales Brochure
Technical Bulletins
- TB251101 – P53W Coolant Heater – Water Pump Cleaning
- TB250401 – PH25AG and PH55AG – Operating Switch Upgrade
- TB250201 – P51W with E-Connect – Switch Wiring
- TB240901 – P51W Plug & Play Espar Hydronic D5 Replacement Heater – Installation Notes
- TB240201 – P25AG Gas Air Heaters – P25AG One-Way Fuel Check Valve
- TB231101 – PH21A Air Heaters – P21A-T802 Drop-In Heater Wiring Connections To Espar Harness
- TB221101 – PH51W – P65D-X301 Timer not keeping time
- TB220701 – PH41A Air Heaters – Gen III Air Heaters Fuel System Priming
- TB220210 – Webasto TSL 17 / Thermo Top Engine Heater – Maintenance Parts
- TB220209 – Espar Hydronic D5 Engine Heater – Maintenance Parts
- TB220208 – PH51WA Engine Heater – PHP Gen I Engine Heater Maintenance Parts
- TB220207 – Webasto AT2000ST Air Heater, 12v – Maintenance Parts
- TB220206 – Webasto AT2000S Air Heater, 12v – Maintenance Parts
- TB220205 – Espar D4 Airtronic Air Heater, 12v – Maintenance Parts
- TB220204 – PH21A Air Heater – PHP Gen III Air Heater Maintenance Parts
- TB220203 – Espar Airtronic D2 Air Heater, 12v – Maintenance Parts
- TB220202 – PH20A Air Heater – Gen II Air Heater Maintenance Parts
- TB220201 – PH23A Air Heater – Gen I Air Heater Maintenance Parts
- TB211201 – PH53W-A & PH52W-A – Seal Kit
- TB210802 – 5kW Engine Heater – Maintenance
- TB210801 – 2kW & 4kW Air Heaters – Maintenance
- TB210701 – PH51W – Operating Switch By-Pass
- TB210401 – All Heaters – PHP Heater Serial Number
- TB210201 – PH20A and PH40A Heaters – Main Wiring Connections
- TB210202 – All Fuel Fired Heaters – Solving Combustion Issues
- TB210203 – All Engine Heaters – Engine Heater Plumbing Guidelines
- TB210204 – All Engine Heaters – Coolant Leaks
- TB200801 – PHP-23A Heater Kits – Main Wiring Connections
- TB141001 – PHP-23A Heaters Controller – Voltage Drop
- TB140201 – PHP-23A Heaters manufactured prior to 2013 – Control Unit Updates
- TB140202 – PHP-23A, PHP-51W Heaters – Heater Serial Numbers
- TB140701 – PHP-23A, PHP-51W Heaters – Blink Codes