Westerbeke

What Westerbeke does

Westerbeke Corporation is a privately held, family-owned manufacturer of marine and industrial power systems headquartered at 150 John Hancock Road in Taunton, Massachusetts, founded in 1937 by John H. Westerbeke Sr. The company designs and builds marine diesel and gasoline generators ranging from 2.4 kW to 95.0 kW, marine propulsion engines under the Westerbeke and Universal brands from 5 HP to 173 HP, industrial diesel generators from 5.5 kW to 14.0 kW, and Rotary Aire self-contained marine climate control systems in 10,000 BTU and 17,000 BTU configurations. Notable proprietary technology includes D-NET electronic diesel generators networked to NMEA 2000 for integration with vessel electronics, multiport EFI gasoline generators with reduced carbon monoxide emissions, electronic governor technology achieving +/- 0.005% frequency regulation, and the patented LubeCell device for cold-weather diesel starting.

The company operates a two-tier distribution model, reaching end customers through more than 70 Master Distributors and their downstream dealers across 65+ countries, supplemented by factory-direct dealers in select U.S. states and direct parts e-commerce on westerbeke.com. It serves four primary verticals: recreational marine (Beneteau, Sea Ray, Chris Craft, Catalina, Nautor's Swan, Oyster Yachts, Sabre), commercial marine, government and military (U.S. Navy, U.S. Air Force, Department of Homeland Security, U.A.E. Coast Guard, Lockheed Martin, Raytheon), and fire-rescue (Pierce, E-One). Pricing is not publicly disclosed; customers are referred to distributors. Westerbeke is a two-time winner of the National Marine Manufacturers Association Innovation Award.

Westerbeke has been led since May 2017 by President and CEO Gregory Haidemenos, who joined the company as Controller in 1996, with John H. Westerbeke Jr. serving as Chairman and Robert Westerbeke as International Sales Manager, preserving family involvement across senior roles. The company carries no disclosed external institutional investors, private equity backing, or parent company, and operates a 51-100 employee organization with in-house engineering anchored by Pro-E Wildfire CAD/CAM, an emissions testing laboratory, and developmental test cells. Headcount, revenue, and detailed financial performance are not publicly disclosed.

Name

Westerbeke

Legal name

Westerbeke Corporation

Website

https://westerbeke.com

Company type

Private

Founded year

1937

Operating status

Operating

Headcount range

51–100 employees

Short description

Westerbeke Corporation is a family-owned U.S. manufacturer founded in 1937 that designs and produces marine diesel and gasoline generators, marine propulsion engines, industrial generators, and marine climate control systems, sold globally through 70+ Master Distributors across 65+ countries to OEM boat builders, government and defense end-users, and the recreational boating aftermarket.

Ownership category

akta.pro rank

Product category

Marine Power Equipment

NAICS

Engine, Turbine, and Power Transmission Equipment Manufacturing (33361), Other Engine Equipment Manufacturing (333618), Ventilation, Heating, Air-Conditioning, and Commercial Refrigeration Equipment Manufacturing (3334)

SIC

Engines & Turbines (3510), Motors & Generators (3621)

akta.pro primary industry

Marine Generators, Alternators & Power Electronics (Gen-sets, VFDs, converters) (IMAJAHAI)

akta.pro secondary industries

Marine Diesel & Dual-Fuel Engines (IMAJAHAA), Marine HVAC, Refrigeration & Ventilation Systems (IMAJAIAE), Propulsion MRO, Spares & Field Service (Overhauls, retrofits, upgrades) (IMAJAHAN), Fuel & Emissions Systems for Propulsion (Fuel supply, SCR, EGR, exhaust aftertreatment) (IMAJAHAK)

Keywords

• Marine generators
• Marine propulsion engines
• Marine diesel gensets
• Marine climate control
• Industrial diesel generators

Headquarters

HQ city

Taunton

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Personnel, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Marine Generator Sales: Sale of marine diesel and gasoline generators ranging from 3.5 to 29.0 kW, sold through distributors and dealers
2. Marine Propulsion Engine Sales: Sale of Westerbeke and Universal brand marine diesel engines ranging from 12 to 66 HP for auxiliary marine propulsion
3. Parts and Accessories: Genuine Westerbeke/Universal/Rotary Aire replacement parts and accessories sold through website e-commerce and distributor network
4. Climate Control Systems: Sale of Rotary Aire marine air conditioning systems in 10,000 BTU and 17,000 BTU models
5. Industrial Generator Sales: Specialized diesel generators for non-marine applications including government and defense uses, ranging from 5.5 to 14.0 kW

Go-to-market motion1 record

Distribution channels3 records

Marketing channels4 records

Core offering

Westerbeke designs and manufactures marine and industrial power equipment, including diesel and gasoline generators (2.4–95 kW), marine propulsion engines (5–173 HP), and self-contained marine air conditioning systems under the Westerbeke, Universal, and Rotary Aire brands. Products are sold worldwide through a network of more than 70 Master Distributors and dealers in over 65 countries, and used by yacht builders, commercial operators, and government agencies.

Product overview

Westerbeke manufactures and supplies world-class marine generators, industrial generators, marine engines, and climate control systems. The product portfolio includes: D-NET™ Electronic Diesel Generators with NMEA 2000® networking (5.0-15.0 kW); Traditional Diesel Generators (2.4-95.0 kW); Multiport EFI Gasoline Generators with reduced CO emissions (3.5-23.0 kW); Industrial Generator Sets (5.5-14.0 kW); Westerbeke and Universal Marine Propulsion Engines (5.0-173 HP); Rotary Aire Marine Climate Control (10,000/17,000 BTU); and Sound Guard enclosures. These products serve pleasure, commercial, government, and industrial marine markets, supported by a global distribution network.

Differentiator

Problem solved

Functional benefit

Brands

• Universal: Universal marine engines by Westerbeke - diesel propulsion engines ranging from 20 to 26 HP
• Rotary Aire
• D-Net
• Sound Guard
• Century

Products and services

• D-NET Electronic Diesel Generators
• Traditional Diesel Generators
• 7.6/5.5 EGTD Diesel Generator
• Multiport EFI Gasoline Generators
• Carbureted Gasoline Generators
• Industrial Generators
• Westerbeke Marine Engines
• Universal Marine Engines
• Rotary Aire Marine Climate Control
• Sound Guard Enclosures
• Genuine Westerbeke/Universal/Rotary Aire Parts and Accessories

Quantifiable outcome

• Generators can achieve over 10,000 hours of operation with no major repairs
• +2 more outcomes

Named customers15 records

Segments5 records

Ideal customer profiles5 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration1 record

Feature5 records

Partnerships

One partnership is on record.

• Hansen Marine EngineeringcoreChannel Partner/ Reseller/ DistributorMaster Distributor located in Marblehead, MA specializing in marine propulsion and fuel injection. Rebuilt engines for customers and provides authorized service and parts support.

Scale indicators4 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• Volvo Penta: Global marine propulsion and auxiliary power OEM owned by Volvo Group, serving recreational and commercial marine with diesel engines, sterndrives, and integrated propulsion systems. Competes with Westerbeke on marine diesel engines and increasingly on hybrid solutions.
• Mercury Marine: Brunswick-owned global leader in marine propulsion (outboards, sterndrives, inboards) and a growing portfolio of marine power systems. Competes with Westerbeke on propulsion engines and ancillary marine power products.
• Yanmar Marine: Japanese manufacturer of marine diesel engines and power systems with strong global OEM relationships. Overlaps with Westerbeke's Universal marine diesel propulsion engine line and marine generators.
• Caterpillar Marine: Marine power solutions arm of Caterpillar, supplying diesel and gas marine engines, generators, and propulsion systems to commercial and government marine. Competes with Westerbeke in industrial and military marine genset applications.

Regional players

• Honda Marine: Honda's marine division producing outboard motors and portable generators with strong brand recognition among recreational boaters. Overlaps with Westerbeke's gasoline generator line in portable and small-vessel applications, primarily in North American recreational markets.

Direct peers

• Fischer Panda: German-based manufacturer of marine generators, hybrid drives, and DC power systems serving recreational and commercial marine. Directly comparable to Westerbeke in diesel/gasoline marine gensets and increasingly in hybrid electric propulsion.
• Northern Lights: Manufacturer of marine generators, marine propulsion engines, and industrial power systems with strong presence in commercial and luxury yacht markets. Closely overlaps Westerbeke's product portfolio across diesel generators and propulsion engines.
• Kohler Marine: Kohler's marine generator division producing marine diesel generators from ~5 kW to 150+ kW for yachts and commercial vessels. Direct overlap with Westerbeke's traditional and D-NET diesel genset lines.
• Cummins Onan: Marine generator line of Cummins Inc., producing diesel and gasoline marine gensets across recreational and commercial segments. Direct competitor in marine auxiliary power with deeper corporate R&D resources.

Emerging players

• Mastervolt: Marine power electronics specialist (now part of Power Products) focused on inverters, battery management, and integrated electrical systems for yachts. Adjacent competitor in connected marine power and a potential disruptor in Westerbeke's D-NET networked genset space.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Westerbeke