Tier 4 Final Compliance
Understand the impact of EPA Tier 4 Final (T4F) emissions regulations for diesel engines from 25 to 75 HP and how they affect Miller diesel engine-driven welder/generators. Learn more >>

An Eco-nomical and Eco-friendly
alternative. Designed to be up to
25% more fuel-efficient during
typical welding operations than other
models. Output of the engine matches
the power required, saving operating
cost and the environment. The fuel
savings really add up when running
day-after-day, while producing fewer
carbon emissions. Runs clean, satisfies tough EPA Tier 4i compliance requirements. Minimize your impact on the environment while you increase your savings.

See How Fuel Savings Add Up - Miller's innovative dual-speed technology lowers fuel costs up to 25%. Plug your numbers into our online calculator to produce a customized fuel savings analysis.

Compact package. The Big Blue
400 Eco Pro is up to 44% smaller
and 41% lighter than other models
—taking less room and reducing
transportation costs.

Quiet operation. In weld mode with
71.5 dBa at 7 meters, it’s up to 10 dBa
quieter than competitive models,
improving work site communication
and safety.

Thermal overload protection prevents machine damage if the duty cycle is exceeded or airflow is blocked.

Mitsubishi S4L2 diesel engine.
Used in industrial applications around
the world, the S4L2 is designed to run
10,000 hours before major overhaul and reduces maintenance costs.

Superior arc performance

• Factory-preset DIG settings (Stick)
• Hot Start™ (Stick)
• Lift-Arc™ TIG with Auto-Stop™ and Crater-out

Simple operation. Operator-friendly
control panel is simplified with colorcoded terminals to get you connected quickly and correctly.

Meter maintenance displays.
• Hour meter function
• Oil change interval
• High coolant temperature and low oil
pressure shutdowns
• Low fuel shutdown—engine shuts
down before system runs out of fuel,
making restarts easy.

High efficiency: 3-phase, rotating-field
welding generator requires less fuel and
horsepower to operate.

Compatible with the Wireless Remote Hand Control. Improve productivity, eliminate clutter and cord tangles in the work area. Eliminate cord failure and associated downtime/repair costs and extend the operator's welding range without adding cord extensions.