Boiler and Machinery Insurance – Equipment Breakdown Coverage Explained
Written by Justin Goodman, CIC, CLCS, CISC, CEO and Co-Founder, Total CSR
Published: August 3, 2026 · Last reviewed: August 3, 2026
In plain language: Boiler and machinery insurance pays to repair or replace equipment like boilers, air conditioners, electrical panels, and production machines when they suddenly break down from within, such as a motor burning out or a boiler exploding. Standard property insurance policy does not cover this type of equipment loss.
Technical definition: Boiler and machinery insurance, now commonly written as equipment breakdown coverage, insures direct physical loss to covered equipment caused by an accident, defined as a sudden and accidental breakdown involving mechanical or electrical failure. It excludes wear and tear, corrosion, gradual deterioration, inadequate maintenance, and operator error, and is typically added as an endorsement to commercial property policies.
Boiler and Machinery Insurance at a Glance
| Attribute | Detail |
|---|---|
| Also known as | Equipment breakdown insurance, mechanical breakdown coverage |
| Category | Commercial property coverage |
| Lines of business | Commercial Property, Equipment Breakdown, Inland Marine |
| Industries most affected | Manufacturing, hospitality, habitational, healthcare, restaurants, office buildings |
| Related forms or endorsements | EB 00 20 (Equipment Breakdown Protection Coverage Form), CP 04 30 (Equipment Breakdown Protection Coverage) |
| Who bears the risk | Property owner or business, absent this endorsement |
| Common solution | Equipment breakdown endorsement or standalone equipment breakdown policy |
| Also interacts with | Business income coverage, extra expense coverage, ordinance or law coverage |
Key Takeaways
- Boiler and machinery insurance, now sold as equipment breakdown coverage, pays for sudden internal mechanical or electrical failure of equipment that standard property insurance policy does not cover.
- Agencies who skip this endorsement leave clients exposed to some of the most expensive and common commercial losses, including HVAC failures, electrical arcing, and motor burnout that can disrupt business operations.
- The most common misunderstanding is assuming a commercial property policy already covers equipment breakdown; most base ISO standard policy form exclude it entirely under mechanical breakdown or electrical arcing exclusions.
- Agencies should quote equipment breakdown coverage options on every commercial property account, even low-limit accounts, because the premium is typically low relative to the risk exposures it closes.
What Is Boiler and Machinery Insurance in Insurance?
Boiler and machinery insurance is insurance coverage for direct physical damage to equipment caused by a sudden mechanical or electrical breakdown from within the equipment itself, rather than from an outside force like fire or wind. The coverage traces back to the early 1900s when actual steam boilers and boiler machines exploded in factories and buildings, causing catastrophic injury and property loss. Insurers built a specialized line around inspecting and insuring pressure vessels, and that specialty evolved into today’s broader equipment breakdown coverage, which now includes HVAC systems, electrical switchgear, security systems, computer systems, office equipment, electronic components, and production machinery.
The insurance coverage exists because standard commercial property forms, including the ISO Building and Personal Property Coverage Form, exclude loss caused by mechanical breakdown and by artificially generated electrical current, including electrical arcing and electrical power surge. Property insurers built that exclusion deliberately. Equipment breakdown is considered a maintenance-related, mechanical failure risk that behaves differently from fire or windstorm, so carriers price and underwrite it separately as part of comprehensive risk management, often bundling in engineering inspections and jurisdictional inspections required by state law.
Consider a hotel with a rooftop chiller unit that cools the entire building. A refrigerant compressor seizes due to an internal bearing failure, not from any external event. The hotel’s commercial property policy denies the claim because mechanical breakdown is excluded under common exclusions. With an equipment breakdown endorsement in place, the same failure is covered, including the cost to repair the malfunctioning machine and the business interruption loss while guest rooms sit without air conditioning.
How Does Boiler and Machinery Insurance Work?
- The equipment failure. A covered object, such as a boiler, motor, electrical system, or electrical panel, experiences a sudden and accidental breakdown from an internal cause like a burst tube, bearing seizure, or short circuit—these sudden events trigger the insurance coverage.
- The trigger determination. The carrier or its engineering team confirms the loss meets the policy’s definition of an “accident,” distinguishing sudden mechanical or electrical failure from gradual wear, corrosion, poor workmanship, or lack of maintenance.
- The damage assessment. An engineer or adjuster inspects the equipment not functioning to determine the cause of failure, the extent of physical damage, and whether any expediting expenses are needed to speed repairs and restore critical services.
- The claim payment. The policy pays to repair or replace the damaged equipment, and if the policy includes consequential damage coverage for business income and extra expense, it also reimburses loss of income and added costs during the downtime, providing financial relief.
- The resolution. The insured equipment is repaired or replaced, often with input from the carrier’s risk control services engineers on preventing recurrence as part of business continuity planning, and normal business operations resume.
Real Claim Examples Involving Boiler and Machinery Insurance
Restaurant walk-in cooler compressor failure
A restaurant’s walk-in cooler compressor failed overnight due to an internal electrical short, and the loss of refrigeration spoiled thousands of dollars in perishable inventory. The restaurant’s commercial property policy excluded the mechanical breakdown, but its equipment breakdown endorsement covered both the compressor repair and the spoiled food under a contamination extension. Business income coverage also reimbursed several days of reduced revenue while the kitchen operated with limited refrigeration devices, preventing significant financial loss.
Apartment complex boiler rupture
A mid-rise apartment building’s centralized boiler experienced a sudden tube rupture, cutting off heat and hot water to fifty units in winter—one of the most serious heating-related accidents. The property manager had never purchased equipment breakdown coverage, believing the base property insurance policy covered “all mechanical systems.” The claim was denied outright, and the building owner paid over $80,000 out of pocket for boiler replacement and temporary heating equipment, suffering substantial restoration cost without financial relief.
Manufacturing plant electrical switchgear arc
A manufacturer’s main electrical switchgear failed due to an internal arc flash, damaging wiring and shutting down the production line for eleven days. Equipment breakdown coverage paid for the switchgear replacement and the business interruption loss tied to the shutdown. The carrier’s risk control services team later recommended thermal imaging inspections to catch similar equipment accidents before they escalated, strengthening the company’s resiliency strategy.
Boiler and Machinery Insurance vs. Commercial Property Insurance: What Is the Difference?
Boiler and machinery insurance, now called equipment breakdown coverage, and commercial property insurance both protect physical assets but respond to different causes of loss. Business property insurance covers external perils like fire, windstorm, and vandalism, while equipment breakdown covers internal mechanical and electrical failure that property forms specifically exclude under common exclusions.
| Comparison area | Boiler and Machinery Insurance | Commercial Property Insurance |
|---|---|---|
| Primary use case | Internal mechanical or electrical equipment failure | External perils like fire, wind, theft, vandalism |
| Coverage / concept type | Named cause of loss endorsement or standalone policy providing broad coverage | Named peril or special form property coverage offering basic coverage |
| Typical exclusions | Wear and tear, corrosion, inadequate maintenance, operator error | Mechanical breakdown, electrical arcing, flood, earth movement, lack of power |
| Who is most affected by errors | Building owners and businesses with mechanical/electrical systems | Any commercial property owner |
| Common mistakes | Assuming the property insurance policy already includes it | Assuming flood or earthquake is automatically included |
What Are the Most Common Mistakes With Boiler and Machinery Insurance?
- Agencies fail to quote equipment breakdown coverage as a standard line item, leaving clients with no insurance coverage for one of the most frequent commercial loss causes and exposing them to significant risk exposures.
- Producers assume that because a building is new, mechanical breakdown risk is low, when in fact new equipment failures from manufacturing defects, poor workmanship, or installation errors are common early claims that can disrupt business continuity.
- CSRs confuse equipment breakdown with a home warranty or maintenance contract, when the coverage is actual insurance triggered by sudden accidental failure, not routine service or commercial boiler maintenance.
- Agencies underinsure the business income component, quoting property damage limits without matching business income and extra expense limits tied to the equipment breakdown endorsement, leaving gaps in coverage options.
- Files lack documentation of which specific equipment is covered, creating disputes when a carrier argues a piece of machinery was never a “covered object” under the schedule, leading to denied claims and financial loss.
- Renewal reviews skip updating the covered equipment schedule after a client installs new HVAC, generators, or production machinery, leaving new assets unprotected and creating unnecessary risk exposures that could affect business operations.
How to Explain Boiler and Machinery Insurance to a Client
Explaining Boiler and Machinery Insurance to a personal lines client
Boiler and machinery coverage mostly comes up for condo associations and larger habitational buildings you might own or live in. Think of it as the insurance coverage that pays when your building’s furnace, boiler, or central air system breaks down internally, not from a fire or storm, but from a mechanical failure inside the equipment. Your regular property insurance policy will not pay for that kind of breakdown on its own, so this coverage helps protect your business and maintain business continuity.
Explaining Boiler and Machinery Insurance to a small business owner
Your commercial property policy covers things like fire and storm damage, but it will not pay if your walk-in cooler compressor burns out, your HVAC system fails from the inside, or you experience an electrical power surge that damages office equipment. Equipment breakdown coverage fills that gap with broad coverage, and it also often reimburses you for loss of income if the failure shuts down part of your operation. It is usually inexpensive compared to the risk it removes and is essential to protect your business from unexpected equipment accidents.
Explaining Boiler and Machinery Insurance to a CFO or risk manager
Equipment breakdown exposure sits outside your standard property form’s named perils and is explicitly excluded through the mechanical breakdown and electrical arcing exclusions in the ISO causes of loss forms. We recommend scheduling all critical mechanical and electrical systems under an equipment breakdown endorsement with matching business income limits as part of a comprehensive risk management and tailored insurance program, since production downtime from a single switchgear failure often exceeds the physical repair cost. This also typically comes with risk control services and jurisdictional inspections that can reduce failure frequency across your facilities, supporting your business continuity planning and resiliency strategy while we design and negotiate the best coverage options for your emerging technology and electronic components.
Frequently Asked Questions About Boiler and Machinery Insurance
Is boiler and machinery insurance the same as equipment breakdown coverage?
Boiler and machinery insurance is the older name for what is now almost universally sold as equipment breakdown coverage. The scope expanded over decades from pressure vessels like boilers to a much broader range of mechanical and electrical equipment, including HVAC, electrical systems, security systems, and computer equipment. Most carriers no longer use the “boiler and machinery” label in policy forms, though the term is still used informally in the industry.
Does a standard commercial property policy cover equipment breakdown?
Standard commercial property forms typically exclude mechanical breakdown and electrical arcing losses under common exclusions. A restaurant’s freezer compressor failing internally, for example, would be denied under a base property insurance policy without an equipment breakdown endorsement. Agencies need to add this insurance coverage separately, either as an endorsement or a standalone policy, to protect your business from these risk exposures.
What kind of equipment is covered under equipment breakdown insurance?
Covered equipment typically includes boilers, HVAC systems, electrical panels and switchgear, motors, compressors, production machinery, refrigeration devices, office equipment, security systems, electronic components, and computer or telecommunications equipment. The exact list depends on the covered equipment schedule attached to the policy. Equipment not listed on the schedule and not otherwise defined as a covered object under the form generally is not covered.
Does equipment breakdown coverage pay for lost business income?
Equipment breakdown policies commonly include or allow the addition of business income and extra expense coverage tied specifically to a covered equipment breakdown. This means a manufacturer that loses production for two weeks due to a motor failure can recover both the repair cost and the loss of income during the shutdown, providing critical financial relief. Limits for this consequential damage coverage component need to be reviewed separately from the base property damage limit.
Why do older buildings need this coverage more than newer ones?
Older buildings often have aging boilers, electrical systems, and mechanical equipment that are more prone to sudden internal failure due to accumulated stress on components. That said, new equipment can also fail from manufacturing defects, poor workmanship, or installation errors, so the risk exposures exist across all building ages. Total CSR’s training data shows CSRs frequently underestimate this risk on newer construction accounts, assuming new equipment cannot break down suddenly.
Is equipment breakdown coverage expensive to add to a commercial policy?
Equipment breakdown coverage is generally inexpensive relative to the risk exposures it covers, often a small percentage of the overall property premium. The low cost is one reason agencies should present it as a standard inclusion rather than an optional add-on. Declining the coverage without documenting that decision in the client file creates unnecessary E&O exposure and leaves businesses vulnerable to financial loss from equipment accidents.
Related Insurance Terms
- Equipment Breakdown Coverage: the modern term for boiler and machinery insurance, covering sudden mechanical or electrical failure of covered equipment and providing comprehensive coverage for equipment loss.
- Commercial Property Insurance: the base policy that insures buildings and business personal property against named perils, but excludes mechanical and electrical breakdown, making equipment breakdown coverage a necessary supplement to protect your business.
- Business Income Coverage: reimburses lost net income and continuing expenses during a shutdown, frequently paired with equipment breakdown coverage when a mechanical failure halts business operations and causes business interruption.
- Extra Expense Coverage: pays additional costs incurred to keep a business operating after a covered loss, often triggered alongside equipment breakdown claims to fund temporary equipment rentals and maintain business continuity.
- Named Peril Policy: a policy structure that lists specific covered causes of loss; commercial property forms are typically named peril or special form, and mechanical breakdown is excluded from both unless added back through an endorsement.
- Inland Marine Insurance: a line of business sometimes used to cover mobile or specialized equipment, occasionally overlapping with equipment breakdown coverage for contractors’ equipment.
Sources and References
- International Risk Management Institute (IRMI). Boiler and Machinery Insurance.
About the Author
Justin Goodman, CIC, CCIP, CISC, CLCS, CRIS, PCIA, QCLS, MFHR
CEO and Co-Founder, Total CSR, Inc.
Justin Goodman is a third-generation insurance broker with over two decades in agency operations. He has trained more than 50,000 CSRs, account managers, and producers in commercial and personal lines coverage, from workers’ compensation to construction risk. He was named 2024 Insurance Journal Agent of the Year and one of the nation’s top five construction insurance experts by Risk & Insurance. He is the author of Retain, which applies cognitive science research on memory and knowledge transfer to insurance training, and speaks nationally on how agencies build durable technical expertise in their teams.