Generac 26kW Guardian
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Generac 26kW Guardian
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Power your large home with the Generation 8 – 26 kW standby generator.
Automatic, quiet, and built for heavy duty loads, HVAC, multiple appliances and whole-home comfort with dealer turnkey installation.
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 Generation 8 – 26 kW Standby Generator is designed for homeowners who demand reliable, automatic whole-home backup. With 26,000 watts on LP and 22,500 watts on natural gas, this model reliably carries large HVAC systems, multiple appliances and critical circuits during extended outages.
Generac’s G-Force 1000 Series engine, True Power™ electrical technology (<5% THD) and electronic governor work together to provide utility-quality power and excellent motor-starting capability so variable-speed HVAC systems and sensitive electronics run safely.
The unit includes an Evolution™ two-line multilingual controller, built-in Wi-Fi/Mobile Link ready connectivity for remote status and maintenance alerts, and a sound-attenuated aluminum enclosure that allows installation as close as 18 in. (where code permits).
A service-rated 200 A transfer switch is available for full service capability; integrated load-management features and Smart Management Modules (SMMs) let you manage multiple large loads without unnecessary oversizing.
For large homes or properties with high electrical demand, the 26 kW delivers dependable power, factory support, and dealer service you can trust.
High standby output
26,000 W (LP) / 22,500 W (NG) for true whole-home backup.
High standby output
<5% total harmonic distortion, safe for sensitive electronics.
Generac G-Force 1000 engine
durable 2-cylinder design built for extended run times and low maintenance.
Evolution™ controller + Mobile Link®
two-line multilingual LCD, 50 event logs, Wi-Fi/4G monitoring options.
Service-rated transfer switch compatibility (200 A)
supports whole-house service and advanced load management.
Quiet, weather-resistant enclosure
critical-grade muffler and sound attenuation for neighbor-friendly operation.
Dealer turnkey delivery
includes site survey, permits, wired transfer switch, fuel hookup, commissioning, and warranty registration by Horizon.
- Generation 8 - 26 kW standby generator (unit)
- Evolution™ controller & standard Wi-Fi/Mobile Link connectivity (as specified)
- Transfer switch (service-rated 200 A or limited circuit option, per quote)
- On-site load assessment and model selection
- Permit pulling, inspection coordination, and site prep (pad/trenching)
- Licensed electrical & gas hookup, system testing, and commissioning
- Warranty registration and owner handover documentation.
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 26kW Standby
Generator Specifications
Specification
26 kW
Rated maximum continuous power (LP)
26,000 W
Rated maximum continuous power (NG)
22 kW (Natural Gas or Liquid Propane)
Rated voltage
240 V
Rated maximum continuous load current (LP / NG)
108.3 A / 93.8 A
Total Harmonic Distortion (THD)
< 5%
Main line circuit breaker
110 A
Phase
Single (1Ø)
Engine
Generac G-Force 1000 Series (2 cylinders)
Displacement
999 cc
Battery (not included)
Group 26R - 12 V, 540 CCA min (or Group 35AGM 650 CCA min)
Unit weight
518 lb (235 kg)
Dimensions (L × W × H)
48 × 25 × 29 in (121.9 × 63.5 × 73.7 cm)
Sound level at 23 ft (normal load)
67 dB(A)
Sound level at 23 ft (Quiet-Test™)
57 dB(A)
Fuel consumption - Natural Gas (1/2 / full)
188 / 333 ft³/hr (5.32 / 9.43 m³/hr)
Fuel consumption - Liquid Propane (1/2 / full)
75 / 132 ft³/hr (2.06 / 3.63 gal/hr) [7.78 / 13.73 L/hr]
Operating speed
3,600 rpm
Warranty
5-year limited (dealer registered)
Listings / Certs
UL / ETL as applicable; EPA certified for non-emergency applications
Notes: fuel pipe must be sized for full load; required fuel inlet pressure: NG 3.5–7 in WC, LP 10–12 in WC. Power reduces ≈3.5% per 1,000 ft above sea level and ≈1% for each 10°F above 60°F.
Accessories & optional add-ons
- Smart Management Module (SMM) - optimizes large load start/management.
- Mobile Link® Cellular (4G LTE) or Wi-Fi/Ethernet.
- Battery pad warmer - (for extreme cold).
- Oil warmer - (cold climates).
- Breather warmer - (extreme icing climates).
- LTE LP tank fuel level monitor.
- Base fascia/plug kits / touch-up paint / scheduled maintenance kit (see PDF for SKUs).
Transfer switch & load management highlights
200 Amp Service Rated Transfer Switch (available) –
Installation, fuel & site notes
Professional, licensed installation is required. Horizon handles permits, site prep, transfer switch wiring, fuel line sizing, and final inspection as part of a turnkey service.
NG 3.5–7 in water column (0.87–1.74 kPa); LP 10–12 in water column (2.49–2.99 kPa). Fuel piping must be sized for full load.
Such as battery pad warmers and oil warmers are recommended in climates that regularly drop below 0 °F.
Expect power to decrease with altitude and temperature (≈3.5% per 1,000 ft and ≈1% per 10°F above 60°F). Plan accordingly.
Warranty & maintenance
- Standard: 5-year limited factory warranty (included when installed by an authorized dealer; warranty registration is provided by Horizon).
- Recommended: annual preventative maintenance (oil/filter, battery, test run), use the scheduled maintenance kit and dealer service to keep warranty valid and performance optimal.
Frequently Asked
Questions (FAQs)
Still have a Questions
If you more questions to know you can check more query related to Generac®
Is the 26 kW generator suitable for whole-home backup?
What are the fuel requirements for the 26 kW model?
How loud is the 26 kW during operation?
What transfer switch do I need with a 26 kW generator?
How often should the 26 kW be serviced and does servicing affect warranty?
Annual service is recommended; Generac specifies regular oil/filter changes, battery checks and system testing. Using Horizon’s scheduled maintenance preserves warranty coverage and keeps the system ready for emergencies.
