Generac 18kW Guardian
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18kw
Generac 18kW Guardian
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18 kW standby generator, whole-home backup for larger houses, large HVAC loads, and higher electrical demand.
Rating and reviews
/5
(50 New Reviews)
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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 durable, sound-attenuated enclosure and integrated Evolution™ controls make the unit easy to use and maintain. Advanced features include automatic voltage regulation, programmable exercise schedules, smart battery charging, and compatibility with service-rated transfer switches and Smart Management Modules for AC load management.
Highest standby power in this family
best for large homes and heavy loads.
True Power™ and ±1% AVR
clean, stable electricity for electronics.
Smart Transfer Switch compatibility
manage multiple large loads, including A/C.
Mobile Link® ready
remote monitoring and maintenance notifications
- Link ready - clear logs and remote monitoring.
- Two-line multilingual digital LCD Evolution™ controller
- 100 amp 16 circuit switch or 200 amp service rated smart switch
- Electronic governor
- Standard Wi-Fi connectivity
- System status & maintenance interval LED indicators
- Sound attenuated enclosure
- Flexible fuel line connector
- Natural gas or LP gas operatio
- 5 Year limited warranty
- Listed and labeled by the Southwest Research Institute allowing 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 18kW Standby
Generator Specifications
Specification
18 kW
Rated standby power (LP)
18,000 W (LP)
Rated standby power (NG)
17,000 W (NG)
Rated current (LP/NG) @ 240V
75.0 A / 70.8 A
Main line breaker
80 A
Phase
Single (1Ø)
Engine
Generac G-Force 800 Series, 2 cylinders
Displacement
816 cc
Battery
Group 26R 540 CCA min or Group 35AGM 650 CCA min
Unit weight
420 lb (191 kg)
Dimensions (L×W×H
48 × 25 × 29 in (approx)
Sound level ( normal load)
65 dB(A)
Sound level (Quiet-Test™)
55 dB(A)
Fuel consumption (NG) 1/2 / full
169 ft³/hr (4.79 m³/hr) / 247 ft³/hr (6.99 m³/hr)
Fuel consumption (LP) 1/2 / full
62 ft³/hr (1.70 gal/hr) [6.45 L/hr] / 110 ft³/hr (3.02 gal/hr) [11.44 L/hr]
Warranty
5-year limited (dealer registered)
Accessories
- Smart Management Modules (SMM) for managing multiple A/C units
- Mobile Link cellular/Wi-Fi modules
- Scheduled maintenance kits
- LP fuel level monitor, battery pad warmer, oil warmer
Installation & warranty notes
- Requires licensed installation, correct fuel-line sizing, and code-compliant siting. Horizon manages permitting and final inspection to ensure the warranty remains valid.
Frequently Asked
Questions (FAQs)
Still have a Questions
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