Gray-Market Equipment and the Missing Warranty

Why this matters

A customer who bought a ductless system, a tankless water heater or a range online and wants you to install it has usually done the math on the purchase price and not on the warranty. If the unit came from a seller the manufacturer does not authorize, there may be no manufacturer warranty at all, and the first person the customer calls when the compressor fails in year two is the shop whose sticker is on the line set. The installation decision is made on the phone, weeks before the unit fails, and it is the only point where the shop controls what it is agreeing to.

What gray market means for whole equipment

Gray-market equipment is genuine equipment, made by the named manufacturer, sold through a channel the manufacturer did not authorize for that market. It is different from counterfeit, where the product was never made by the named maker at all (See related: Provenance Is Part of the Rating).

It reaches customers three common ways:

• Unauthorized resellers, including third-party sellers on online marketplaces, who buy surplus or diverted stock and resell it.
• Export-market units, built for another country's voltage, frequency or code, carrying certification marks from that country's scheme, and sometimes a model number one character off the domestic version.
• Old stock, units sitting in a warehouse since before a regulatory change, sold at a discount because they can no longer be sold through the normal channel.

Where the warranty goes missing

Manufacturer warranties on HVAC equipment, water heaters and major appliances commonly carry conditions such as:

• Purchase from an authorized dealer or distributor, with proof of purchase.
• Installation by a licensed or qualified contractor, sometimes specifically a contractor in the maker's dealer program, with that condition stated in the warranty document for the product.
• Registration within a window the warranty states, often 60 or 90 days from installation, with the longer parts term only applying if registered.
• Installation to the maker's instructions and local code, which a warranty can use to deny a claim on an improper install.

Gray-market units fail the first condition by definition, and the maker may decline any warranty, regardless of who installs it. Whether a particular exclusion is enforceable against a particular consumer is a question of the warranty's text, the federal Magnuson-Moss Warranty Act (which governs written warranties on consumer products but does not oblige a maker to warranty units sold outside its channel), and your state's consumer law. That is a question for the customer's or your own attorney, not one to answer on the phone. This is not legal advice.

What the shop can know for certain is operational: whether the maker will honor a claim on this unit, and whether the shop is willing to install a unit with no manufacturer behind it.

The shop's exposure

The labor warranty becomes the only warranty. The customer will expect you to cover what the maker would have. Your labor warranty covers your workmanship. Without a manufacturer, a failed compressor or heat exchanger has no one to replace it at no cost, and the customer's memory of who stands behind the system will not be precise.

Inspection and listing. NEC 110.2 and 110.3(B), as adopted by your jurisdiction, tie electrical equipment to approval and to its listing. An export unit carrying no mark from a lab your inspector accepts can fail a permit inspection, and a unit built for 50 Hz is not a unit you can make right with wiring.

Refrigerant rules. A pre-charged split system still requires a certified technician to evacuate, open and charge it under EPA's Section 608 rules, and your certification is on the work. Separately, EPA's Technology Transitions rule under the AIM Act restricted the installation of new residential split air conditioners and heat pumps using higher-GWP refrigerants such as R-410A, with a sell-through for components made before 2025 that, as the rule was written, ended at the start of 2026. EPA announced a reconsideration of parts of that rule in 2025. Check EPA's current Technology Transitions page before installing an old-stock R-410A split system, because an install the rule prohibits is a violation by the installer.

Liability. If a unit with no US listing starts a fire, the question of who chose to install it will be asked. Your general liability carrier is the one to ask in advance whether it covers installation of customer-supplied equipment of unknown channel.

One gate, two customers

The gate, run on the phone before the job is booked: can the customer show proof of purchase from a seller the maker lists as authorized, is the unit the domestic model with a US-recognized listing, and does the unit meet the refrigerant rules in force on the install date? All three yes, the shop installs on its normal terms. Any no, the shop either declines or installs only under a written disclosure the customer signs.

Customer A: a 12,000 Btu/h single-zone ductless heat pump. The customer bought it from an online retailer. The office asks for the order confirmation and checks the retailer against the dealer locator on the maker's website: listed. The nameplate photo the customer texts shows the domestic model number, 208/230 volt 60 Hz, a recognized lab mark, and R-454B refrigerant. The warranty document, downloaded from the maker's site, requires installation by a licensed contractor and registration within 60 days. Gate: three yes. The shop books it, quotes the line set, electrical and labor, installs it, and the office registers it with the shop's license number on day one, well inside the 60-day window. The install record carries the unit serial (See related: Warranty Registration and Proof of Installation).

Customer B: the same capacity, a different source. The customer bought from a marketplace third-party seller at a large discount. The seller does not appear on the maker's locator. The nameplate photo shows R-410A and a manufacture date in 2024, and the box has been opened and taped. The office calls the maker's warranty line with the serial: no warranty, sold outside authorized channels. Gate: no on channel, and a refrigerant-rule question on the date.

The shop's call on B, and the reasoning. The refrigerant question decides it first. If the rule in force on the install date prohibits installing that unit, the shop declines and says why, and no disclosure form changes that. If the current rule allows it, the shop may install, but only with a written disclosure that there is no manufacturer warranty, that the shop's warranty covers its labor only for its stated term, and that parts replacement will be quoted and billed. Many shops simply decline B, and that is a defensible business choice: the margin on one install does not cover the conversation in year two.

The failure mode. A shop that books B without the call to the maker finds out about the missing warranty when it files the first claim, after it has already promised the customer the maker would cover it.

The phone call that settles it

CUSTOMER: I bought a mini split online. Can you put it in?
OFFICE:   Probably. Can you text me the order receipt
          and a photo of the label on the outdoor unit?
CUSTOMER: Why the label?
OFFICE:   The model and the refrigerant decide whether we
          can legally install it, and the seller decides
          whether the maker will cover it. If it is not
          covered, I want you to know before we start,
          not when something breaks.
CUSTOMER: And if it is not covered?
OFFICE:   We can still talk about it, but our warranty is
          only on our work, and parts would be billed. I
          will put that in writing for you to sign.

The script does three things in order: gathers the two facts the gate needs, tells the customer why without accusing them of buying badly, and puts the consequence in front of them before the shop's time is committed.

What changes the answer

The unit is an appliance with no refrigerant or gas connection, such as a range hood or a dishwasher. The refrigerant rule falls away, and the gate is channel and listing only. The decision leans more on how the shop wants to handle the warranty conversation than on legality.

The customer bought from an authorized seller but the unit is old stock. Channel passes; the regulatory date and the warranty start date still need checking, because some warranties run from the date of manufacture when the install date cannot be proven.

A whole-system replacement versus a component. For a single part a customer brings, the shop's existing customer-supplied part policy governs (See related: The Risk You Take On With a Customer-Supplied Part; How to Handle a Customer-Supplied Material Decision).

How to know the shop has this right

Any install of customer-supplied equipment has, in the job record, the proof of purchase, the nameplate photo, the result of the maker's warranty check, and either a registration confirmation or a signed disclosure. If the office cannot pull those four for a unit installed last spring, the gate was not run.

References

• Magnuson-Moss Warranty Act, 15 U.S.C. 2301 and following, for written warranties on consumer products
• NFPA 70, National Electrical Code, 110.2 and 110.3(B), as adopted by your jurisdiction
• EPA Section 608 rules (40 CFR Part 82, Subpart F) and the Technology Transitions rule under the AIM Act; check EPA's current program pages for status
• See related: The Risk You Take On With a Customer-Supplied Part; How to Handle a Customer-Supplied Material Decision; Warranty Registration and Proof of Installation; The Gray-Market Mini-Split With No Warranty