Best Whole-House Standby Generators (2026)
A standby generator is one of the few purchases where who services it locally matters more than the specification. This guide compares the three brands that dominate residential standby, and is honest about the fact that installation, not the unit, is usually the larger half of the bill.
Kohler residential standby
- Among the quietest in the category — the difference is audible from a neighbour's garden
- Warranty covers labour and travel for the full term, not just the first two years
- Specialises in standby rather than treating it as one product line among many
The ranked top 3
Kohler residential standby
Best where noise matters and you want labour covered
The premium choice — quieter running, strong power quality, and a warranty that covers labour and travel for the full term.
Generac home standby
Best if you want the shortest wait for service after a storm
The largest dealer and parts network in North America — which is the specification that matters most on day three of an outage.
Briggs & Stratton home standby
Best for partial-home backup on a tighter budget
The sensible option when the goal is keeping heat, well pump, fridge and a few circuits running rather than the whole house.
Compared
| Pick | Best for | Typical installed cost | Labour + travel cover | Network |
|---|---|---|---|---|
| Kohler residential standby | Best where noise matters and you want labour covered | 20 kW: about $7,500–13,000 | Full warranty term | Smaller than Generac |
| Generac home standby | Best if you want the shortest wait for service after a storm | 22 kW: about $7,000–12,000 | Years 1–2 only | Largest in North America |
| Briggs & Stratton home standby | Best for partial-home backup on a tighter budget | 10 kW: about $5,500–8,000 | Full warranty term | Smaller |
How we reviewed this
The unit is not the purchase
Across this category the generator is often little more than half the cost. The rest is the transfer switch, the gas or propane supply, the pad, the electrical work and the permit. Two identical units quoted by two installers can differ by thousands, so get more than one quote and make sure each covers the same scope.
What this guide is based on
Published specifications, warranty documents, dealer-network reach and installed-cost ranges reported across the trade, plus general experience of what owners run into after the first few years. We have not run these units under controlled load testing, and we publish no numeric score, because a score implies a measurement we did not take. Cost ranges are indicative and regional — treat them as a sanity check on a quote, not a price.
What we weigh
- - Who services it locally. After a regional storm, network size decides whether you wait days or weeks.
- - What the warranty actually covers. Every brand quotes a headline term; the difference is whether labour and travel are included for that whole term or only the first two years. That gap is worth real money.
- - Sound level, because it will run for hours, close to a neighbour, possibly at 3am.
- - Whole-house or partial. Partial backup is a legitimate, much cheaper answer that most buyers dismiss too quickly.
Links
Manufacturer reference links, not affiliate links — we are not currently in these programmes. If that changes the link will be labelled and the page disclosure still applies.
Why Trust Our Recommendations
FAQ
What size generator do I need?
It depends on whether you want the whole house or the essentials. Whole-house on a typical home lands around 20–22 kW; essentials-only — heat, well pump, fridge, a few lights and outlets — is often satisfied by 10 kW for thousands less. Have an electrician calculate the actual load rather than sizing by house square footage.
Which brand is best?
There is no single answer, and any guide that gives you one is skipping the important question. Kohler for quiet running and full-term labour cover. Generac if fast service after a storm is the priority, because the network is the largest. Briggs & Stratton if partial-home backup on a budget is the goal. Before deciding, find out which of them has a servicing dealer near you — that often settles it.
Why does the labour warranty matter so much?
Because the headline warranty term is not the number that costs you money. Kohler and Briggs cover labour and travel for the full term; Generac, Cummins and Honeywell cover labour and travel for years 1–2 only. On a unit that lives outside and runs for years, a service call in year four is a real bill on one and covered on the other.
Have you tested these yourself?
No. This is a comparison of specifications, warranty terms, network reach and reported installed costs, informed by trade experience with this class of equipment — not a load-test result, and we will not present it as one.
About the reviewer
Nelo Tested Trade-informed — see who publishes Nelo Tested and how we review.