Kohler Standby Generator Authorized Distributor — Contractor Pricing
PES stocks 85 Kohler SKUs across the premium residential RESA/RESV line and the REZG/REOZK commercial line — the brand hospital and premium residential specifiers ask for by name.
PES Supply is an authorized online distributor for Kohler standby generators. This page is the working reference for contractors and installers who quote Kohler residential and commercial standby jobs and want distributor-tier pricing, real inventory, and OEM parts backing. We stock 85 Kohler SKUs at our Louisville, Kentucky distribution center — from air-cooled residential 14–26 kW through liquid-cooled commercial 30–150 kW — and ship to installer accounts every business day.
Kohler is the premium standby generator brand. On residential, the RESA and RESV lines (14, 20, 24, 26 kW) command a 10–15% price premium over Generac Guardian at equivalent kW, and Kohler earns it in three ways: KOHLER-branded engines (KDI or Yanmar-partnered for larger units), a distinctive gasket-sealed corrosion-resistant enclosure that outlasts painted steel in coastal environments, and a specifier-friendly name that reads well on hospital board packets and premium new-construction spec sheets. On commercial, the REZG (30–48 kW) and REOZK (60–150 kW) lines are the go-to when a hospital or data-center specifier wants a Kohler badge. PES stocks 85 Kohler SKUs to cover that specifier demand.
The Kohler lineup breaks into three tiers. RESA is the residential air-cooled entry (14 kW, 20 kW). RESV is the top-of-residential (24 kW, 26 kW). REZG is light-commercial liquid-cooled (30 kW to 48 kW), and REOZK is the commercial/industrial line (60 kW to 150 kW, plus diesel variants). Every line uses gasket-sealed enclosures with corrosion-resistant fasteners.
| Model Family | kW Range | Class | Fuel | Typical Contractor Price (Tier-1) |
|---|---|---|---|---|
| RESA Residential Air-Cooled | 14 – 20 kW | Residential entry | LP/NG dual-fuel | $4,600 – $6,400 |
| RCA Residential | 20 kW | Residential (mid) | LP/NG dual-fuel | $6,200 – $7,000 |
| RCL Residential | 24 kW | Residential top-of-class | LP/NG dual-fuel | $7,400 – $8,200 |
| RESV Residential Top | 26 kW | Residential premium | LP/NG dual-fuel | $8,200 – $9,400 |
| REZG Commercial NG/LP | 30 – 48 kW | Light commercial | NG or LP | $16,000 – $23,500 |
| REZG Commercial Diesel | 30 – 48 kW | Light commercial | Diesel | $18,500 – $27,000 |
| REOZK Commercial NG/LP | 60 – 100 kW | Commercial | NG or LP | $28,000 – $46,000 |
| REOZK Commercial Diesel | 60 – 150 kW | Commercial | Diesel | $34,000 – $64,000 |
| REOZK Industrial | 150 kW | Industrial | NG or diesel | $62,000 – $76,000 |
The 26RESV (26 kW residential) and the 20RESA/RCA (20 kW residential) are our volume Kohler residential SKUs — spec'd on premium residential jobs where the customer wants the Kohler name and the corrosion-resistant enclosure. On the commercial side, the 48REZG and 80REOZJ are the highest-turn Kohler commercial SKUs.
Standby generator demand in the United States has grown roughly 10–14% per year for the past decade, driven by an aging grid, longer average outage durations, and the electrification of heating (heat pumps) and transportation (EV chargers) that widens the gap between grid-outage impact and homeowner tolerance for it. Inside that growing market, each of the four major brands has a defensible position that contractors should recognize before they quote a job.
Kohler's share is concentrated where its structural advantages line up with customer priorities. On residential jobs, that means the customer profile, the fuel available, and the willingness to pay a premium (or press for a discount) tilt each spec toward one brand over another. On commercial jobs, the tilt is mostly about who the specifier is and what reads well on their procurement committee's spec sheet.
Contractor rules of thumb for when Kohler is the right pick
- Premium-tier residential (14–26 kW) where the homeowner wants best-in-class fit and finish plus the KOHLER brand cachet and is willing to pay the premium.
- Coastal or high-humidity residential where the KOHLER powder-coat and corrosion package is worth the delta over the base air-cooled competition.
- Commercial or hospitality job (30–250 kW) where the specifier wants a KOHLER diesel or NG package for spec-sheet parity with legacy KOHLER installs.
- Healthcare or life-safety job at 100–300 kW where the KOHLER industrial line's UL 2200 listings and NFPA 110 compliance carry weight.
- Homeowner who values the OnCue Plus monitoring platform and the KOHLER dealer-service network's premium after-sales reputation.
- Job where the specifier wrote 'KOHLER' by name — the four-brand OEM-authorized channel means you can quote it straight without a spec deviation.
Kohler residential RESA/RESV/RCA/RCL units ship LP/NG dual-fuel with field-selectable conversion. REZG commercial units are fuel-committed at factory build (NG, LP, or diesel per SKU). REOZK commercial and industrial units offer NG, LP, and diesel, plus limited bi-fuel on select 100–150 kW SKUs.
| Generator | Fuel Options | kW De-rate (NG vs LP) | Recommended Transfer Switch | Notes |
|---|---|---|---|---|
| 14RESA (14 kW) | LP/NG | 12 kW on NG | Kohler RXT 100A | Small essential-circuits |
| 20RESA (20 kW) | LP/NG | 18 kW on NG | Kohler RXT 200A | Whole-home 2,500 sq ft |
| 20RCA (20 kW premium) | LP/NG | 18 kW on NG | Kohler RXT 200A SE | Whole-home mid-market |
| 24RCL (24 kW) | LP/NG | 21 kW on NG | Kohler RXT 200A SE | Whole-home dual-AC |
| 26RESV (26 kW) | LP/NG | 23 kW on NG | Kohler RXT 200A SE | Top of residential class |
| 30REZG NG (30 kW) | NG or LP | Rated NG | 200–400A ATS | Light commercial |
| 38REZG NG (38 kW) | NG or LP | Rated NG | 400A ATS | Light commercial |
| 48REZG NG (48 kW) | NG or LP | Rated NG | 400A ATS | Light commercial |
| 60REOZJ diesel (60 kW) | Diesel | N/A | 400A ATS | Commercial |
| 80REOZJ diesel (80 kW) | Diesel | N/A | 400A ATS | Commercial |
| 100REOZK NG (100 kW) | NG or LP | Rated NG | 600A ATS | Commercial |
| 150REOZK diesel (150 kW) | Diesel | N/A | 800A ATS | Commercial/industrial |
Kohler RXT transfer switches integrate with the Kohler generator's control panel over a proprietary bus that enables genuine service-entrance operation, load-shed relay control, and exercise scheduling from the generator's front panel. That integration is the specifier reason many premium residential jobs choose Kohler over cheaper alternatives.
Common Kohler residential kit configurations
- 20 kW residential whole-home NG: Kohler 20RESA + RXT 200A SE ATS + NG service verified 400 CFH + composite pad.
- 26 kW residential whole-home LP (coastal): Kohler 26RESV + RXT 200A SE ATS + 500-gal LP tank + composite pad (corrosion-resistant enclosure is the specifier reason).
- 48 kW light-commercial NG: Kohler 48REZG NG + 400A ATS + engineered concrete pad + regulator upsize.
- 80 kW hospital diesel: Kohler 80REOZJ diesel + 400A ATS with load management + engineered pad + 150-gal sub-base diesel tank.
- 150 kW data-center diesel: Kohler 150REOZK diesel + 800A ATS with paralleling + engineered pad + 500-gal sub-base + fuel polishing system.
| Application | Recommended Kohler Model | Fuel | Transfer Switch |
|---|---|---|---|
| Whole-home essential circuits | 14RESA | LP or NG | RXT 100A + load management |
| Whole-home, 2,500–3,500 sq ft | 20RESA / 20RCA | LP or NG | RXT 200A SE |
| Whole-home, 3,500–4,500 sq ft | 24RCL | LP or NG | RXT 200A SE |
| Whole-home premium, 4,000–5,500 sq ft | 26RESV | LP or NG | RXT 200A SE |
| Small clinic / medical office | 30–48 REZG NG | NG | 200–400A ATS |
| Hospital / imaging center | 60–100 REOZJ/REOZK diesel | Diesel | 400–600A ATS |
| Data center standby | 125–150 REOZK diesel + paralleling | Diesel | 800A ATS + switchgear |
| Coastal residential (corrosion) | 20RCA or 26RESV | LP or NG | RXT 200A SE |
Kohler earns two spec-sheet wins consistently. First, coastal residential — the gasket-sealed corrosion-resistant enclosure outlasts painted-steel Generac and Briggs units by roughly 40% in salt-air environments. Second, hospital and data-center specs — Kohler's name carries weight on institutional procurement committees where 'Generac' reads as consumer-grade even though the Industrial SD line is genuinely commercial.
Kohler residential RESA/RESV/RCA/RCL units carry a 5-year / 2,000-hour limited warranty with labor coverage in years 1–2. Kohler commercial REZG and REOZK units carry a 5-year limited standby warranty. Warranty registers through Kohler Power Systems' dealer portal — PES pushes registration at invoice against the end-user address.
| Line | Warranty Term | Labor Coverage | OEM Parts Coverage |
|---|---|---|---|
| RESA/RCA/RCL/RESV Residential | 5 yr / 2,000 hr | Yr 1–2 | 5 yr parts |
| REZG Light Commercial NG/LP | 5 yr limited standby | Yr 1 (most) | 5 yr parts |
| REZG Light Commercial Diesel | 5 yr limited standby | Yr 1 | 5 yr parts |
| REOZJ/REOZK Commercial | 5 yr limited standby / 2 yr full | Yr 1 full | 5 yr parts, 2 yr full |
| REOZK Prime Power | 1 yr / 1,000 hr full | Yr 1 full | 1 yr parts + hours |
⚠ Warranty registration is not automatic on grey-market channels
Every Kohler unit sold through PES is warranty-registered against the end-user address through the OEM portal on invoice. Units sold through unauthorized channels do not carry the standby 5-year warranty automatically — the OEM will not honor a claim without proof of authorized-channel sale. Confirm the distributor is on the OEM's authorized list before you buy.
Kohler's positioning is premium residential and premium commercial. The comparison matrix:
| Dimension | Kohler | Generac | Cummins | Briggs & Stratton |
|---|---|---|---|---|
| Residential SKUs at PES | Lowest (85) | Highest (849) | Mid | Mid-high |
| Corrosion-resistant residential enclosure | Yes (gasket-sealed) | Painted steel | Painted steel | Painted steel |
| Premium spec-sheet recognition | Highest | Broad but consumer-tinged | Highest (commercial) | Growing |
| Commercial diesel breadth | Deep (REOZJ/REOZK) | Yes (Industrial SD) | Deepest (C-series) | Fortress |
| Price vs equivalent Generac | 10–15% premium | Reference | Similar to slight premium | 5–10% below |
| Coastal environment fit | Best (gasketed enclosure) | Requires sea-coast package | Requires marine option | Standard enclosure |
| Whole-home 200A SE ATS | RXT 200A SE (integrated) | RXSW200A3 | RA200 | Symphony 200A |
Every standby generator becomes a parts customer the day it's commissioned. Air-cooled units consume oil filters, air filters, spark plugs, and batteries; liquid-cooled units consume the same list plus coolant, coolant hoses, and the occasional control-board revision. PES stocks the OEM part numbers under the same freight terms as the units — same tier discounts, same next-business-day shipping from Louisville. Serial-traceable part numbers pass Kohler warranty audit; grey-market 'compatible' aftermarket parts do not.
Kohler service parts stocked at PES (short list)
- OEM filter kits (oil, air, and fuel) matched to every stocked Kohler residential and commercial SKU.
- OEM batteries (Group 26 to Group 31) for Kohler standby generator battery replacement.
- OEM control-panel components — controllers, wiring harnesses, and display modules for Kohler standby lines.
- OEM enclosure hardware — fasteners, gaskets, and access panels stocked for Kohler residential units.
- OEM coolant and coolant additive per Kohler liquid-cooled specifications (long-life or standard).
- Transfer-switch replacement contactors, coils, and control cards for Kohler-branded ATS models.
On multi-unit residential installer accounts, PES bundles a starter parts kit with the initial generator purchase order — filters, spark plugs, and oil for the first three annual services on each unit. That single line item saves the installer the pain of re-ordering three months later when the first service call comes due.
These seven steps are the sequence PES account reps walk through with contractors when a new job comes in. Follow them and the quote comes out tight the first time.
Confirm the spec is worth the premium
Kohler prices 10–15% above Generac Guardian at equivalent kW. That premium is worth it when the customer values the Kohler name, the corrosion-resistant enclosure (coastal), or when the spec is destined for a hospital or corporate procurement committee. On price-sensitive residential jobs, Briggs or Generac usually wins.
Size against the load with NG derate
Sum continuous watts + largest motor-start surge. Multiply peak by 1.10 for NG. Pick the Kohler residential unit one step above: 14RESA, 20RESA, 20RCA, 24RCL, or 26RESV. Above 26 kW after derate, cross to 30REZG liquid-cooled.
Pair the RXT transfer switch
Kohler RXT transfer switches integrate with the Kohler generator over a proprietary control bus — this is a Kohler-ecosystem lock-in that specifiers value because exercise scheduling, load-shed control, and diagnostics all run from the generator's front panel. RXT 200A SE is the whole-home default.
For REZG commercial: fuel-commit at PO
REZG 30/38/48 kW is fuel-committed at factory build. Suburban commercial defaults to NG. Rural or long-runtime jobs default to diesel. REOZK 60+ kW offers NG, LP, and diesel, plus limited bi-fuel at 100–150 kW.
Verify service radius before finalizing
Kohler's residential dealer network is thinner than Generac's, especially in rural areas. Verify a Kohler-authorized service technician is within a 90-mile radius of the install address before locking a Kohler spec for a customer in a rural ZIP. Commercial REOZK spec'd for a hospital or data center is served by Kohler's commercial service network, which is denser than the residential network in urban areas.
Engineer the pad for liquid-cooled skids
REZG 30/48 kW pads: 8 ft × 5 ft × 6 in reinforced concrete. REOZK 100 kW pad: 10 ft × 5 ft × 6 in. REOZK 150 kW: 12 ft × 6 ft × 8 in with 4 ft clearance all sides. Coordinate with a structural engineer for commercial installs.
Bundle the quote and register the warranty
Kohler residential and REZG light-commercial bundles run 3–5% below the sum of Tier-1 line items. REOZK commercial project quotes (generator + ATS + switchgear + freight) run 5–8% below line-item pricing. PES pushes warranty registration through Kohler Power Systems dealer portal at invoice.
Is PES an authorized Kohler distributor?
Yes. PES holds an active Kohler Power Systems distribution agreement. Warranty registration for Kohler units sold through PES flows through the Kohler dealer portal, and Kohler OEM parts ship with serial-traceable part numbers.
What's the difference between Kohler RESA and RESV?
RESA is Kohler's residential air-cooled entry line (14, 20 kW). RESV is the residential top-of-class line (26 kW). Both use gasket-sealed enclosures with corrosion-resistant fasteners. RESV adds a larger KOHLER-branded engine with cast-iron cylinder liners and pressure lubrication rated for higher runtime.
Why does Kohler cost more than Generac at the same kW?
Three reasons. First, the gasket-sealed corrosion-resistant enclosure — Kohler enclosures outlast painted-steel enclosures by roughly 40% in coastal or high-humidity environments. Second, the KOHLER-branded engine and Kohler-manufactured control panel — Kohler builds more of the unit in-house than most competitors. Third, brand equity — the Kohler name reads well on hospital procurement committees and premium new-construction specs. Contractors get paid to spec Kohler on those jobs.
What is Kohler's residential warranty term?
Kohler RESA/RESV/RCA/RCL residential standby carries a 5-year / 2,000-hour limited warranty. Years 1 and 2 include labor coverage. PES pushes warranty registration through the Kohler Power Systems dealer portal at invoice against the end-user address.
What transfer switch pairs with the Kohler 26RESV?
The Kohler RXT 200A service-entrance ATS is the standard whole-home pairing. RXT switches integrate with Kohler generators over a proprietary control bus that enables exercise scheduling and load-shed control from the generator's front panel — a Kohler-ecosystem advantage over generic third-party ATS units.
Does Kohler offer diesel residential standby?
No. Kohler residential RESA/RESV/RCA/RCL is LP/NG dual-fuel air-cooled only. Diesel starts at the REZG 30 kW commercial line. For diesel residential specs in rural applications, the smallest Kohler diesel option is 30REZG liquid-cooled.
What's the difference between REZG and REOZK commercial lines?
REZG is Kohler's light-commercial liquid-cooled line, 30 kW to 48 kW, NG/LP or diesel. REOZK is the commercial and industrial line, 60 kW to 150 kW, NG/LP or diesel with paralleling options. The crossover point is between 48REZG and 60REOZJ — the REOZ platform adds heavier-duty engine mounts, larger radiators, and paralleling switchgear compatibility.
Are Kohler generators a good pick for coastal residential?
Yes. The Kohler gasket-sealed corrosion-resistant enclosure is one of the best pieces of hardware on the residential standby market for salt-air environments. Painted-steel Generac and Briggs enclosures show corrosion at year 4–5 in Florida, Gulf Coast, or coastal Carolina; Kohler enclosures show minimal corrosion at year 8–10 in the same environments.
How does Kohler REZG compare to Generac Protector at 48 kW?
48REZG NG and Generac Protector RG04854 (48 kW NG) are direct competitors. Warranty terms are equivalent (5-yr limited standby). Kohler prices 8–12% above Generac at Tier-1 contractor pricing. Kohler's advantage is spec-sheet recognition on institutional jobs and the enclosure quality. Generac's advantage is price and dealer density.
What's the biggest Kohler standby unit PES stocks?
PES stocks Kohler 150REOZK (150 kW diesel or NG) as the flagship commercial standby. Above 150 kW (200 kW, 300 kW, 500 kW+), Kohler builds to spec at the factory with 4–8 week lead times; PES quotes those as project orders through Kohler's dealer channel.
Does Kohler stock at PES include commercial spare parts?
Yes. PES stocks Kohler OEM filters, Kohler-branded coolant, control-panel components, and RDC/DC-series controller parts for REZG and REOZK commercial units. Genuine Kohler parts ship serial-traceable and pass warranty audit.
Where does PES ship Kohler generators from?
PES ships Kohler units from our Louisville, Kentucky distribution center via LTL freight to all 48 contiguous states. Drop-ship direct from Kohler's Wisconsin or Mississippi facilities is available for bulk commercial project orders. Will-call pickup at the Louisville dock is available with 30-minute call-ahead.
Standby generators do not fail from age. They fail from missed service. Every one of the four brands specifies an annual service that keeps the warranty in force and the unit ready to start on the first outage of the year. Kohler residential air-cooled service is roughly the same across the lineup: change the oil and filter, check air filter, replace the spark plugs at year 2 and every 2 years after, load-test the battery, exercise the unit under full load, and inspect the enclosure and gas line. Liquid-cooled commercial units add coolant checks, coolant additive replenishment, and belt/hose inspection.
Kohler standard annual service kit (residential air-cooled)
- Oil change with OEM-spec 5W-30 synthetic (roughly 1.7 qt for air-cooled; 5–8 qt for liquid-cooled per model).
- Oil filter replacement — OEM part number matched to the Kohler SKU.
- Air filter inspection — replace at year 2 or after any major dust event.
- Spark plug replacement at year 2 and every 2 years after (air-cooled only).
- Battery load test — replace at year 4 or on any weak-start indication.
- Full-load exercise cycle — verify frequency stability, voltage regulation, transfer to load and back.
- Gas-line leak check with soap solution at every connection between meter and generator.
PES bundles the annual service kit as a stocked SKU so the installer's service tech shows up with everything on the truck. On multi-unit installer accounts, PES ships service kits on an annual cadence tied to install anniversary dates — the installer's back office doesn't have to re-order per-unit.
Open a contractor account with PES Supply
Get pallet-quantity pricing, tier discounts, and drop-ship freight on Generac, Cummins, Briggs & Stratton, and Kohler standby generators — plus access to the interactive sizing, voltage-drop, wire-sizing, and freight calculators on the PES contractor portal.
Register for contractor pricing →Registered contractors — access the interactive calculators on the PES contractor portal
- Generator Sizing Calculator — spec kW, ATS, fuel line, and pad in one screen
- Voltage Drop Calculator — NEC 210.19(A) informational note conductor sizing
- Wire Sizing Calculator — NEC 310.16 ampacity with derating
- Freight Calculator — pallet-quantity freight quotes 48 states
