Generac 20kW Guardian
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20 kW
Generac 20kW Guardian
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20 kW standby generator, impressive automatic backup for larger homes and high-demand circuits, balancing high starting torque with quiet, code-compliant installation.
Rating and reviews
/5
(50 New Reviews)
- 5
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5.0
Our Generac generator is what saved our belongings and is what ultimately saved us as a family. There was utter chaos and destruction outside, but my home was air conditioned and I had power.
Jennifer
Home User
5.0
We searched all over Indiana for the right company. Horizon was by far the most professional, and their installation was flawless. Our generator runs like a dream!”
Ethan & Laura
Home user
The Generation 8 – 20 kW standby generator delivers dependable, automatic backup power for larger single-family homes and properties with substantial electrical demands.
Built on Generac’s proven G-Force 1000 engine platform, the 20 kW model supplies reliable, utility-quality power to critical loads, HVAC systems, refrigerators, sump pumps, and essential household circuits during outages. True
Power™ electrical technology keeps total harmonic distortion under 5% so electronics and variable-speed drives run safely.
The unit features a weather-resistant, sound-attenuated enclosure, an electronic governor, and the Evolution™ two-line multilingual controller for intuitive status readouts and event logs. Mobile Link® connectivity and remote monitoring are included on Wi-Fi-equipped models so homeowners can check generator health
from a smartphone.
Horizon offers turnkey installation, load assessment, permits, transfer switch integration, professional gas/electrical hookup and commissioning, and registers
your factory warranty upon completion. With UL/ETL family safety listings, robust engine design, and proven motor-starting capability, the 20 kW unit is an excellent choice where strong, automatic backup is required.
20,000 W (LP) / 18,000 W (NG)
rated standby capacity for heavy-duty backup.
Generac G-Force 1000 Series engine
durable, low-maintenance design built for extended run times.
True Power™ electronics & ±1% AVR
provide clean power (<5% THD) for sensitive devices.
Evolution™ controller + Mobile Link -
clear logs, maintenance alerts and remote monitoring.
Sound-attenuated, weather-resistant enclosure
and compact footprint (install as close as 18" where code allows)
Service and parts network support
through Generac and Horizon dealer service.
- True Power™ Electrical Technology
- Two-line multilingual digital LCD Evolution™ controller
- 200 amp service rated transfer switch available
- Electronic governor
- Standard Wi-Fi connectivity
- System status & maintenance interval LED indicators
- Sound attenuated enclosure
- Natural gas or LP gas operatio
- 5 Year limited warranty
- Listed and labeled for installation as close as 18 in (457 mm) to a structure.*
Who this unit is best for
Homeowners Choose Us
Medium to large single-family homes that want near whole-home backup
Homes with central HVAC systems that must stay on during outages.
Families who want automatic, hands-free protection (no portable generator setup).
Homeowners looking for a long-term, low-maintenance standby solution.
Generac 20kW Standby
Generator Specifications
Specification
20 kW
Rated standby power (LP / NG)
20,000 W / 18,000 W
Rated current @ 240 V (LP / NG)
83.3 A / 75.0 A
Main line circuit breaker
90 A
Phase
Single (1Ø)
Engine
Generac G-Force 1000 Series (2 cyl)
Displacement
999 cc
Unit weight
~448 lb (203 kg)
Dimensions (L×W×H)
~48 × 25 × 29 in
Noise (23 ft, normal load)
~67 dB(A)
Quiet-Test™ noise
~55 dB(A)
Fuel options
Natural Gas or LP (propane)
Fuel consumption (representative)
Evolution™ two-line LCD (multilingual)
Controller
5-year limited (dealer registered)
For precise per-SKU fuel consumption and per-SKU weights/dimensions, use the downloadable tech PDF linked on the product page. All spec values above come from the supplied spec sheet.
Accessories
- Smart Management Module (SMM) for large A/C management.
- Mobile Link cellular/Wi-Fi.
- Battery pad warmer, oil warmer, breather warmer for cold climates.
- Scheduled maintenance kit (model-specific).
Installation & warranty notes
- Professional, licensed installation required, includes transfer switch wiring, fuel connection, pad/trenching, and permitting. Horizon registers the factory's 5-year limited warranty at commissioning.
Frequently Asked
Questions (FAQs)
Still have a Questions
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