Comparison
Generac vs Kohler: How to Compare Two Standby Brands
We have not tested either brand, so we will not crown one. Here is how to make the comparison yourself.
Written by HyreElectrical Research Desk Primary-source research and fact checking
The short answer
Generac vs Kohler is a comparison you should make on four things: the size each dealer proposes for your loads, the transfer switch it comes with, the written warranty terms for the exact model, and the local dealer who will service it.
HyreElectrical has not tested either brand, so we do not rank them. Both sell home standby generators installed with a transfer switch. Kohler’s energy business was renamed Rehlko in 2024. Size your loads first with the generator sizing tool.
Compare the two bids on these lines
Ask each dealer to fill in the same rows. A bid that cannot answer a row is the weak bid, whatever the brand.
| Line | What to ask | Why it matters |
|---|---|---|
| Size (kW) | Which loads does this size start and run? | Starting a well pump or central AC drives size more than brand |
| Transfer switch | Whole-house or managed circuits? Automatic? Service-rated? | The switch decides what stays on and is the safety-critical part |
| Fuel | Natural gas or propane? Who checks the gas line size? | Fuel supply can limit output |
| Warranty | Send the written warranty for this exact model | Terms differ by model and registration |
| Service | Who maintains it, and how far away are they? | A standby set needs scheduled maintenance |
| Permits | Electrical, gas and placement permits — who pulls each? | Clearances to windows and property lines are local rules |
Why we do not pick a winner
A fair ranking needs hands-on testing and long-term service data. We have neither, and a ranking without them would be marketing. Brand matters less than three things you control: correct sizing, the right transfer switch and a dealer who answers the phone after a storm.
Read generator installation for what the job involves and the standby generator and automatic transfer switch definitions.
Portable sets: carbon monoxide kills
If you are using a portable generator until the standby is installed, CPSC says to run it "outdoors only, at least 20 feet from homes and buildings," never in a garage, even with the door open. Never backfeed through an outlet.
What drives the price difference
We publish no figures. Between two bids, the gap usually comes from size, the transfer switch type, the gas line work, the pad and placement, and the permit — not the badge. Type each bid into the generator cost calculator and compare line by line.
Questions
Is Generac or Kohler better?
Is Kohler now called Rehlko?
What size standby generator do I need?
Does the brand affect the transfer switch?
Who maintains a standby generator?
Written and audited by
HyreElectrical Research Desk
Primary-source research and fact checking
We read the model code, the federal safety notice, the municipal fee sheet or the utility tariff ourselves, and we publish the figure with the document it came from and the date we retrieved it.
Where a number cannot be traced to a primary source, we publish the shorter page and say what we could not verify. HyreElectrical does not perform, supervise or warrant electrical work. Authorship is organizational: this desk, not a named persona.
- 16
- original research studies published
- 5
- states with verified license records
- 16,369
- electrical companies in those records
- 74%
- of the store is Florida — disclosed first, not footnoted
How this desk works
- Primary sources only. Code statements come from NFPA 70 as the model code. Safety statements come from CPSC. Permit fees come from the city or county fee sheet. Utility charges come from the filed tariff. We do not cite a blog that cites a source; we open the source.
- Our contractor store is five states, and 74% of it is Florida. Any figure built on that store is titled to those states and names the concentration in the first screen. It is not a national sample of electricians.
- Load calculations on this site are a published simplification in the shape of NEC 220.82 — first 10 kVA at 100%, remainder at 40%, HVAC at 100%, EVSE at 125%. They are labeled as not a stamped calculation. A licensed electrician using the adopted edition does that work.
- No national price for a panel upgrade is shipped. Labor rates, the adopted code edition, whether the utility is involved, and the state of the existing wiring move the invoice too far for a roundup to help. The cost pages publish named permit fees and the variables that move the price instead.
- We do not perform electrical work, and we take no payment for placement, ranking or a favorable mention. Nobody buys a position on this site.
Data as of October 26, 2026. Authorship on this site is organizational: the analysis belongs to the desk rather than to a named individual, and we do not publish credentials we do not hold. Our editorial policy sets out how we source, date and correct what we publish.
Sources & retrieval dates
Get two bids against the same load list
Hand each dealer the same list of loads and compare the rows above.
HyreElectrical is a publisher. It does no electrical work, holds no license and has no partner electricians, and matching is not live yet. No one paid for placement on this page.