Rheem SEREGEN 300 Series Generator

Rheem is proud to offer the SEREGEN® 300 Series 20kW Home Generator System. Boasting a 993cc commercial Vanguard™ engine and 28,000 watts of starting power, the system offers whole house comfort & control in an extremely compact & affordable package. The standard 20kW package will supply enough automatic backup power to manage two 5-ton AC units. The optional Power Management System upgrade optimizes the SEREGEN 300 Series with advanced computer-controlled power for maximum efficiency.
  • Fully Automatic – Advanced electronics will detect a utility power outage and automatically start the generator whether you are home or away.
  • Whole House Comfort – The SEREGEN 300 Series will supply enough power to manage up to two 5-ton air conditioners in addition to essential household power requirements.
  • Vanguard™ 993cc Engine – An industry leading commercial grade Big Block™ air-cooled engine provides powerful, quiet, durable performance for large, power hungry homes – perfect for years of heavy-duty standby power.
  • Continuous Fuel Supply – A permanent connection to natural gas or propane delivers uninterrupted performance with no messy gasoline storage and refueling.
  • Sound Shield™ Technology – engineered air passages, an automotive-style exhaust system and acoustic foam dampeners ensure quiet operation. (68dB under normal operation)
  • Turn Key Extras – each system includes a  battery charger, hour meter, and installation pad. The engine also comes pre-filled with synthetic oil and is broken in at the factory, saving you time and money.
  • Premium Warranty – 4 year limited – your guarantee of quality and performance.
  • Legendary Service & Support – From professional sizing and delivery to installation and service, trust the proven experts at Rheem for complete peace of mind.
Powers both Essentials & High-wattage Items for Premium Comfort & Maximum Efficiency:
  • Lights
  • Furnace Fan
  • Refrigerator/Freezer
  • Garage door opener
  • Security System
  • Humidifier/dehumidifier
  • Entertainment System
  • Sump Pump
  • Outside Lighting
  • Microwave
  • Central Air Conditioner 1
  • Central Air Conditioner 2
  • Range/Stove
  • Dryer
  • Water Well pump
  • Hot Tub
  • Pool Heater
  • Water Heater


  • Fully Automatic Start
  • Provides Whole House Comfort
  • Industrial Strength Engines
  • Continuous Fuel Supply from Natural Gas/Propane
  • Sound ShieldTM Technology
  • Contemporary Space Saving Design
  • Durable Outdoor Enclosure


Battery Warmer Installation Manual
GEN30LP, GEN30NG Installation and Startup Manual
GEN30LP, GEN30NG Operator Manual
GenAlert Product Sheet
Generator Batteries
Indoor Load Monitor Manual
Installation Check List
Installation Manual
Oil Heater Installation Manual
Power Management System
Stat Station Instruction Manual
Wattage Worksheet

Warranty Information:

  • Limited Warranty – 4 Years

If you are looking for an honorable HVAC company to keep your home running smoothly, please contact the experts at Wheeler’s Plumbing, Heating & Cooling in Northglenn, Colorado today.

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