Overview#
The MTU 6R0185 GS200 is a 200 kW natural gas standby generator set powered by a Doosan 11.1L CAC — an 11.1-liter, 6-cylinder inline turbocharged and charge-air-cooled spark-ignition engine producing up to 225 kWm gross on natural gas. This is the most powerful unit in MTU's 6-cylinder inline gas generator lineup and sits at the upper boundary of what the 6R-series gas platform can deliver.
On liquid propane vapor, the rated output drops to 130 kW standby — a 35% reduction from the NG rating. LP installations should be carefully sized to account for this derating. The engine is EPA certified with a 3-way catalyst and uses a Bosch electronic isochronous governor (±0.5% speed regulation). Standard equipment includes a 24V electric start, unit-mounted radiator rated for 50°C ambient, and the MTU digital control panel with SAE J1939 communications and NFPA 110 compatibility.
The GS200 shares the same footprint length (142 in) as the GS150 but is taller due to the larger 11.1L engine block, weighing in at 3,096 kg — plan accordingly for structural and seismic loading during site design.
Technical Specifications#
Power Ratings (60 Hz, 1800 rpm)
| Rating | kW | kVA |
|---|---|---|
| Standby — NG | 200 | 250 |
| Prime — NG | 175 | 219 |
| Standby — LP | 130 | 162 |
Engine — Doosan 11.1L CAC
| Parameter | Value |
|---|---|
| Displacement | 11.1 L (673 in³) |
| Configuration | 6-cylinder inline |
| Aspiration | Turbocharged and charge-air-cooled |
| Rated speed | 1800 rpm |
| Governor | Bosch electronic isochronous, ±0.5% |
| Max gross power (NG) | 225 kWm (302 bhp) |
| Max gross power (LP) | 155 kWm (208 bhp) |
| Emissions | EPA certified, 3-way catalyst |
| Starting | 24V electric, 1,050 CCA |
Fuel Consumption (natural gas at 1000 BTU/ft³)
| Load | NG Consumption | LP Consumption |
|---|---|---|
| 100% load | 2,115 ft³/hr (59.9 m³/hr) | 704 ft³/hr |
| 75% load | 1,648 ft³/hr (46.7 m³/hr) | 600 ft³/hr |
| 50% load | 1,157 ft³/hr (32.8 m³/hr) | 404 ft³/hr |
Physical (Open Power Unit)
| Dimension | Value |
|---|---|
| Length | 3,607 mm (142 in) |
| Width | 1,591 mm (62.6 in) |
| Height | 2,026 mm (79.75 in) |
| Dry weight | 3,096 kg (6,258 lb) |
Cooling System
| Parameter | Value |
|---|---|
| Radiator ambient rating | 50°C (122°F) |
| Water pump capacity | 310 L/min (82 gpm) |
| Heat rejection to coolant | 194.6 kW |
Our Service Experience#
The Doosan 11.1L CAC is the largest engine in MTU's 6R gas generator series and operates at high specific output — 225 kWm from 11.1 liters means relatively high cylinder pressures and temperatures. This engine rewards consistent service intervals: oil quality degrades faster at high load factor, and the charge air cooler should be inspected at every annual service for internal leaks and external fin blockage.
At 200 kW, natural gas supply infrastructure sizing becomes important. The unit requires 2,115 ft³/hr at 100% load — for a building with multiple gas appliances running simultaneously, confirm that the utility service has adequate delivery capacity and that the generator fuel inlet pressure remains within 7–11 inches of water column under maximum simultaneous demand.
Frequently Asked Questions#
What is the LP derating on the GS200? On liquid propane vapor, the GS200 is rated at 130 kW standby — a 35% reduction from the 200 kW NG rating. This is the largest LP derating in the 6R gas series. If LP is your primary or backup fuel, size the unit at 130 kW output for worst-case planning.
How does the GS200 compare to the diesel DS200? Both provide 200 kW standby but serve different fuel infrastructure situations. The diesel DS200 is more compact and has higher fuel energy density per gallon, but requires diesel fuel storage infrastructure. The GS200 eliminates diesel storage and uses utility gas supply. The GS200 is also significantly heavier (6,258 vs. ~3,500 lb) and larger.
What gas supply pressure is required? Vaporous supply (NG or LP vapor): 178–279 mm H₂O (7–11 inches of water column). The 2" NPT inlet connection handles the higher flow rate required at 200 kW.
Is the GS200 available with UL 2200 listing? Yes, UL 2200 and CSA certification are available as options for the 208V and 240V voltage configurations.
