BossJet Vertical Hot Box 99012V

BossJet Vertical Hot Box 99012V

12VDC, 8-10 GPM Diesel Hot Box

Turn Cold Water Pressure Washers into a Hot Water Beast. The BossJet 99012V Vertical Diesel-Fired Hot Box is built for professionals who need serious heat and high flow without upgrading to a full hot water pressure washer. Designed to pair seamlessly with existing cold water pressure washers, the 99012V delivers on-demand hot water for faster, more effective cleaning on demanding job sites.

Product Details:

Model: 99012V

Compatible Flow Rate: 8.0–10.0 GPM

Power Supply: 12VDC

Battery Required: Group 24 Deep Cycle (not included)

Cord / Plug: No cord / No plug

Burner: SDC diesel burner with electronic ignitor BTU Output: 420,000

Maximum Water Temperature: 93°C / 200°F

Heating Coil: 260' x 1/2" Schedule 80 cold-rolled steel

Fuel Tank Capacity: 26.5 L / 7 gal black poly

Adjustable Thermostat: Yes

Flow Switch: Yes High Limit Switch: No

Rupture Disk: Yes

Inline Fuel Filter: Yes

Burner Switch: Toggle

Warranty Coverage Burner: 3 Years

Warranty Coverage Heating Coil: Lifetime

Price $5,699.00

Free Freight - 48 States
If you're delivering to a Residential address with no forklift and or dock, $79.00 liftgate service (2nd button below) is required for delivery.

Delivery Liftgate Service
Price $79.00

BossJet 12VDC, 8-10 GPM Diesel Fired Hot Box

12V Models Dimensions Shipping Weight GPM Price

# 99012V 34" × 25" × 54" 545 lbs 8.0 – 10.0 $5,699.00

At the core of the 99012V is an SDC diesel burner with electronic ignition, designed for reliable ignition and consistent heat output in demanding environments.

Engineered for high-volume applications, this hot box supports 8.0–10.0 GPM, making it ideal for fleet washing, agriculture, heavy equipment, and industrial cleaning. Powered by a 12VDC system and producing 420,000 BTU, the 99012V heats water up to 93°C / 200°F, dramatically improving grease removal and reducing chemical use.

Housed in a rugged powder-coated steel frame, the vertical design keeps the footprint compact while delivering industrial-grade durability and performance. Built for High-Flow Hot Water Performance. The 99012V is purpose-built for operators who require heat at higher flow rates. Adding hot water to your pressure washer allows you to: Cut through grease, oil, and heavy grime faster .Reduce detergent usage Improve cleaning efficiency on large surface areas. Tackle tough industrial and agricultural cleaning jobs.

For professionals running high-GPM cold water pressure washers who need reliable hot water performance, the 99012V Hot Box delivers industrial heat, durability, and efficiency on demand.

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