GUARDIAN provides peace of mind for homeowners with 24/7 automatic power protection from blackouts whether you are home or away. Back up preselected circuits or the whole house within seconds of a power outage. Permanently installed. Runs on LP or natural gas. Includes PowerManager™ LTS whole house transfer switch.Engine OHVI Engine Displacement (cc) 992 Speed (RPM) 3,600 Rated Watts (kW) 20 Rated Watts LP (kW) 20 Rated Watts NG (kW) 18 Volts 120/248 Amps 83.3 Engine Cooling Air Start Type Automatic Phase 1 Noise Level (dB) 66 Transfer Switch PowerManager LTS 200 Amp load-shredding transfer switch with service disconnect NEMA 3R outdoor rated Fuel Type LP or Natural gas Enclosure Aluminum Mounting Pad Yes Battery Required Yes Battery Included No Auto Shutdown Yes UL Listed Yes Dimensions L x W x H (in.) 52 x 24 x 28.25 Additional Product Specs * 20 kW liquid propane * 18 kW natural gas * Generac OHVI® 992cc industrial engine for long-run, long-life operation * Handsfree operation: no fueling, no manual starting, no extension cords * True Power™ technology for safe operation of sensitive electronics * Powerful output for greater starting power * Whisper-Test™ ultra-quiet self-test feature * Aluminum enclosure for superior corrosion resistance * Pre-wired with 16 circuits * PowerManager® LTS 200 Amp load-shredding transfer switch with service disconnect (NEMA 3R outdoor rated) * External main circuit breaker * System status LED * Digital control panel * Maintenance interval LED * External GFCI outlet * Flexible fuel line connector * Outdoor connection box * Composite mounting pad * Matching fascia for base * UL listed * 48in.L x 24in.W x 28 1/4in.H