HHM Series
Portable Diesel/Oil Heated Hot Water Heater Module HHM
This portable heater module transforms an existing cold-water pressure washer into a high-performance hot-water cleaning system. Powered by diesel, fuel oil, or kerosene (vapor-phase only), it delivers 3,500 PSI at 6.0 GPM with a maximum outlet temperature of up to 250 °F (150 °F rise at 4 GPM).
Constructed on a powder-coated steel frame with stainless-steel coil wrap and 13-inch flat-free tires, this unit is rugged, mobile, and industrial-grade. It includes a horizontal Schedule 80 heat exchanger, adjustable thermostat, 35-foot GFCI-protected power cord, and a 12-foot jumper hose with quick-connect fittings for easy attachment.
The unit is ETL-certified for both U.S. and Canadian safety standards and features corrosion-protective finishes and reliable operating components.
Key Benefits for Allied Rubber Customers
- Converts cold-water pressure washers into hot-water units for improved heavy-duty cleaning
- High capacity: 3,500 PSI and 6.0 GPM with up to 250 °F outlet temperature
- Compatible with No. 1 or No. 2 diesel, fuel oil, or kerosene burners
- Durable mobile design: flat-free tires, stainless-steel-wrapped coil, forklift-ready frame
- Plug-and-play installation with jumper hose and temperature control
- Safe and compliant: ETL-certified, GFCI-equipped, adjustable thermostat control
- Optional upgrades: skid feet, stainless-steel coil wrap, stack adapter available


























