Head to head
Generac Guardian 14kW vs Generac Guardian 18kW
Generac · Home Standby Generator
Generac Guardian 14kW
~$4,889
14,000 W · up to well pump or a small central AC
Generac · Home Standby Generator
Generac Guardian 18kW
~$5,279
18,000 W · up to whole home with central air
Quick takeThe Generac Guardian 14kW lists about $390 lower; the Generac Guardian 18kW puts out more sustained power (18,000 W).
| Spec | Generac Guardian 14kW | Generac Guardian 18kW |
|---|---|---|
| Approx. price | ~$4,889 | ~$5,279 |
| Type | Home Standby Generator | Home Standby Generator |
| Fuel | NG/LP | NG/LP |
| Running / output watts | 14,000 W | 18,000 W |
| Starting / surge watts | 14,000 W | 18,000 W |
| Battery capacity | — | — |
| Expandable to | — | — |
| Noise | 65 dB | 65 dB |
| Runtime | Continuous (runs on home NG/LP supply); 14kW on both LP and NG | Continuous (runs on home NG/LP supply); 18kW on LP, 17kW on NG |
| Outlets | None — hardwired via automatic transfer switch (sold separately on this SKU) | None — hardwired via automatic transfer switch (sold separately) |
| Fuel tank | — | — |
| Weight | 385 lbs | 420 lbs |
| Transfer-switch ready | Yes | Yes |
| Warranty | 5-year limited | 5-year limited |
Highlighted cell is the better figure for that row.
Owner pros and cons
Generac Guardian 14kW
- +No natural-gas derate — 14kW on either fuel
- +Twin-cylinder engine runs smoother than the 10kW single
- +Quiet-Test weekly exercise runs at low RPM to keep noise down
- +True Power <5% THD is safe for electronics
- +Mobile Link Wi-Fi status and alerts included
- −Transfer switch not included at this price
- −Support is dealer-dependent; owners advise picking the dealer with the best service reputation
- −Needs load-shedding to handle larger AC units
- −Install quotes routinely add $4,000-8,000 on top of the unit
Generac Guardian 18kW
- +Only ~$400 more than the 14kW for 4kW more capacity
- +Handles central AC plus essentials without load juggling in most homes
- +65 dB under load is reasonable for the output
- +200-hour oil change interval keeps maintenance light
- +Massive installer availability means competitive install quotes
- −Transfer switch, battery, and cold-weather kit are all extra
- −17kW NG rating (small derate) — size off NG if that's your fuel
- −Warranty claims move at dealer speed, not yours
- −Aluminum enclosure dents more easily than competitors' thicker shells