Hartford Steam Boiler
Corporate brand
UnclaimedAmerican specialty insurer founded in 1866 that pioneered boiler and machinery inspection insurance and now provides equipment breakdown, cyber, and technical risk coverage worldwide.
Last updated October 30, 2026
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Overview
Hartford Steam Boiler — formally The Hartford Steam Boiler Inspection and Insurance Company, and widely known by its initials HSB — is an American specialty insurance and technical inspection company headquartered in Hartford, Connecticut. It is generally recognized as the originator of boiler and machinery insurance, a line of coverage created in the nineteenth century to protect owners and operators of steam boilers and other pressure equipment against catastrophic failure. HSB was founded in 1866, in the same era when steam power was transforming manufacturing, rail transport, and urban infrastructure in the United States, and its business model combined engineering inspection with insurance underwriting — a combination that remains its defining characteristic. HSB's core offering is equipment breakdown insurance, which covers loss from the accidental failure of boilers, pressure vessels, mechanical equipment, and electrical systems, together with related business interruption. Beyond that core, the company has expanded into a broad portfolio of specialty and technical risks: cyber insurance and technology-related coverage, construction and builder's risk, renewable energy and solar equipment protection, marine and inland marine, product liability and recall, and inspection and engineering services. HSB distributes much of its coverage through reinsurance, treaty arrangements, and partnerships with other insurers, agents, and brokers, and it operates internationally as well as in the United States. For much of its history HSB was an independent, publicly traded company listed on the New York Stock Exchange. In 2000 it was acquired by the German reinsurer Munich Re, under whose group it continues to operate as a specialty insurance subsidiary. HSB is known in the industry for its engineering and loss-prevention expertise, its data and inspection services, and its role in establishing equipment breakdown as a recognized insurance line. Its brand is associated with technical rigor, risk engineering, and long-standing specialization rather than mass-market consumer insurance.
History
Hartford Steam Boiler was organized in Hartford, Connecticut, in 1866, at a time when steam boilers were proliferating in factories, mills, locomotives, and steamships and boiler explosions were a frequent and deadly hazard. The company's founding idea was that systematic engineering inspection could prevent many of these failures, and that insurance could be written profitably on equipment that was regularly inspected. This pairing of inspection with underwriting became the template for the boiler and machinery insurance line and gave HSB a distinctive technical identity among American insurers. Through the late nineteenth and twentieth centuries the company expanded its inspection and insurance operations across the United States and into international markets, broadening its scope from steam boilers to pressure vessels, mechanical equipment, electrical machinery, and eventually a wide range of industrial and commercial risks. It built a large field inspection force and accumulated engineering data on equipment failure that underpinned its underwriting. HSB operated for decades as an independent, publicly traded company whose shares were listed on the New York Stock Exchange. In 2000 the German reinsurer Munich Re acquired the company, and HSB became a specialty insurance subsidiary within the Munich Re group. Under Munich Re, HSB continued to develop equipment breakdown and related specialty coverages and expanded into newer risk areas such as cyber insurance, technology and data risks, renewable energy equipment, and product recall, while maintaining its inspection and engineering services business. The company remains headquartered in Hartford and continues to market itself under the HSB brand as a specialist in technical insurance and risk engineering, distributing coverage through insurers, reinsurance arrangements, agents, and brokers in the United States and abroad.
- 2000
Acquired by German reinsurer Munich Re and became a specialty insurance subsidiary.
- 1866
Founded in Hartford, Connecticut, pioneering boiler and machinery inspection insurance.
Products and positioning
Specialty technical insurer and risk-engineering specialist focused on equipment breakdown and technology-related risks, operating as a Munich Re subsidiary.
Equipment breakdown insurance
Boiler and machinery insurance
Cyber insurance
Inspection and engineering services
Recent events
- Unconfirmed
Reported
Munich Re to acquire At-Bay for $575 million[3]
Munich Re Group has agreed to acquire At-Bay, a US-based cyber insurtech, for $575 million, with the deal expected to close in the first quarter of 2027 subject to regulatory approvals. At-Bay will sit within Hartford Steam Boiler (HSB), Munich Re's specialty insurance arm.
Reported
Hartford Steam Boiler sponsors University of Hartford IoT lab[4]
Hartford Steam Boiler is sponsoring an Internet of Things lab at the University of Hartford. The sponsorship also gives HSB Applied Technology Solutions opportunities to test sensor technologies and improve its algorithms.
Sources4 sources
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