The manufacturer's warranty you already have

The coverage that came with the house

A typical resale transfers several thousand dollars of relatively young equipment: a furnace replaced two winters ago, a water heater installed last spring, a dishwasher swapped in before listing. Each arrived with a written warranty from the company that built it — an instrument separate from the seller's disclosure, the inspection report and any home service contract. Several of them are usually still running on closing day.

This is the only coverage in the transaction that costs the buyer nothing; it was paid for in the price of the equipment, by somebody else. What it asks in return is attention: a model number, a serial number, an installation date and a document, collected while the seller is still reachable and the equipment still accessible. Buyers who skip that step rarely lose the warranty by any formal act. They lose the ability to prove they are entitled to it, which produces the same outcome at the same cost.

The governing statute is the Magnuson-Moss Warranty Act of 1975, implemented by Federal Trade Commission rules at 16 CFR Parts 700 through 703. It does not require any manufacturer to warrant anything. It regulates the document once one is offered — how it must be titled, what it must disclose, and what it may not demand of the consumer in exchange for performance.

What a limited warranty grants, and for how long

Nearly every warranty on residential equipment resolves into layers, each carrying a different duration and a different allocation of cost: one short and comprehensive, the rest long and narrow.

The comprehensive layer typically runs one year from the date of purchase or, for equipment that is installed rather than plugged in, from the date of installation. Inside that year the manufacturer covers the part and the labour to fit it, through a servicer it authorises. Beneath that sit the component-specific terms — a sealed refrigeration system, a compressor, a heat exchanger, a glass-lined tank — and those longer terms are commonly parts-only.

Parts-only decides whether year six of a ten-year warranty is worth anything. The manufacturer ships a component; the homeowner pays the diagnostic visit, the labour, the refrigerant, the brazing and often the freight. On sealed-system work those costs routinely run to several multiples of the part, which is why a homeowner holding a valid parts-only claim is sometimes quoted a repair worth more than the equipment and declines it. The warranty performed exactly as written. It simply never promised the expensive half.

Two limits travel with almost all of these documents. Coverage attaches to the unit in its original installation location, so equipment moved elsewhere generally leaves the warranty behind. And the grant reaches defects in materials and workmanship — not wear, not damage, and not the consequences of an installation that departed from the manufacturer's instructions, which is the most common reason a young unit is denied.

Full and limited are legal designations, not adjectives

Under 16 CFR 700.6, a written warranty on a consumer product manufactured after 4 July 1975 and actually costing the consumer more than $10 excluding tax must be designated on its face as either a Full (statement of duration) Warranty or a Limited Warranty. Those are compliance labels, not marketing words, and which one appears tells the reader whether the document meets the federal minimum standards.

The FTC's guidance for warrantors sets out four standards a warranty must satisfy to be titled full: the warrantor does not limit the duration of implied warranties; service is provided to any owner of the product during the warranty period; all warranty service is free of charge; and if the product cannot be repaired after a reasonable number of attempts, the consumer chooses between replacement and a full refund. Fail one and the document must be titled limited.

Notice what the second standard does. A full warranty runs with the product rather than with the person who bought it, and 700.6 states that a full warranty may not expressly restrict the warranty rights of a transferee during its stated duration. That is why almost nothing on a residential equipment list is a full warranty: manufacturers want the original-purchaser limitation, the parts-only years and a time limit on implied warranties, and each of those choices forces the limited designation.

For products costing more than $15, Part 701 dictates what the document must disclose and Part 702 — the Pre-Sale Availability Rule — requires the terms to be readable before purchase rather than in the carton. The FTC's Businessperson's Guide to Federal Warranty Law is the plainest statement of both.

Is registration legally required for coverage?

Generally, no — and the regulatory detail is more interesting than the bare answer.

16 CFR 700.7 addresses warranty registration cards directly. Paragraph (a) recites the statutory rule that a warrantor offering a full warranty may not impose any duty other than notification of a defect as a condition of securing remedy, unless it can demonstrate that the additional duty is reasonable. Paragraph (b) then answers the question outright: a requirement that the consumer return a warranty registration card or a similar notice as a condition of performance under a full warranty is an unreasonable duty. A full warranty cannot be voided over a card that was never posted.

The limit of that rule matters as much as the rule. It is written for full warranties, and nearly all residential equipment carries a limited one. A limited warranty may impose duties on the consumer, registration included, provided the duty is disclosed and can be shown to be reasonable — and the FTC's consumer guidance acknowledges that with some products a registration card must be returned to qualify for service.

Do not assume registration is a formality; do not assume it is a condition. The document decides. What the document almost always requires, registration or not, is proof of the purchase or installation date — and that is the requirement which actually breaks in a resale.

What registration actually buys

Registration is worth doing, largely for reasons unrelated to whether a claim is paid.

Recall notification. This is the real product. The Consumer Product Safety Commission's guidance to recalling firms lists registration cards among the sources from which a company obtains contact information for direct notice, alongside sales records and service agreements — and direct notice is the most effective channel a recall has. An unregistered appliance in a house that has changed hands twice is, from the manufacturer's side, an anonymous serial number with no address attached.

Proof of date held by someone other than you. Registration fixes the purchase or installation date in the manufacturer's own system. Several manufacturers also publish a serial-number lookup reporting a unit's warranty status; Rheem's warranty portal, for example, offers product registration and verification of warranty terms by serial number.

A longer term, where the manufacturer sells one. Residential HVAC is the clearest case. It is common for a manufacturer to publish two parts warranties for the same equipment: a shorter base term applying automatically, and a longer registered term available only if the equipment is registered within a stated window after installation. Where that structure exists, registration is not paperwork — it is the difference between the two terms.

What happens to the warranty when the house changes hands

Three mechanisms are routinely confused here, and separating them explains most of the disappointment.

The first is standing. Magnuson-Moss defines a consumer to include any person to whom the product is transferred during the duration of an implied or written warranty applicable to the product. A subsequent owner is therefore a consumer for statutory purposes.

The second is the scope of the written warranty, which is where transfer usually fails, because standing to enforce a warranty is not the same as being inside one. A limited warranty may lawfully restrict enforceability to the original consumer purchaser, and when it does, 16 CFR 701.3 requires the document to say so: the first item a written warranty must clearly and conspicuously disclose is the identity of the party to whom it is extended, if enforceability is limited to the original consumer purchaser or otherwise limited to persons other than every consumer owner during the term.

The third is the partial transfer, which catches the buyer who thinks they have checked. In several equipment categories the whole-unit term follows the house while the long registered or component term does not transfer at all, drops to a shorter transferred duration, or survives only if the new owner notifies the manufacturer within a stated period after the sale, sometimes with a transfer fee. The buyer hears “ten-year warranty,” the seller repeats it, and neither has read the clause that shortens it the moment the deed records.

The proof problem: no receipt, no installation date

Warranty terms start on a date, and in a resale the buyer holds neither the receipt that establishes it nor the installation invoice that substitutes for one. This is the most common way a live warranty becomes unusable, and it costs more than convenience: where an installation date cannot be documented, manufacturers commonly compute the term from the date of manufacture encoded in the serial number instead, and equipment can sit in a warehouse for a year before installation. The default rule shortens the warranty by exactly the period the buyer cannot account for.

Substitutes exist, and the useful ones are available during the transaction rather than after.

• The data plate. Photograph the model number, serial number and any manufacture-date code on every major unit — furnace, air handler, condenser, water heater, and the plate behind the kick panel or inside the door of each appliance. This single step preserves every other option.
• The installer's sticker and the permit record. Replacement HVAC and water heaters are frequently permitted, so a jurisdiction's permit file can date an installation years later, and the sticker names someone holding the invoice.
• The seller's own file. Repair invoices, the installation contract and the manuals in the kitchen drawer are ordinary requests to make during the option or inspection period, while the seller still has a reason to answer.

Where extended warranties and service contracts overlap

A buyer can end up holding three instruments on the same dishwasher: the manufacturer's limited warranty, an extended service plan bought at the point of sale, and a home service contract negotiated into the purchase agreement. They are not cumulative in the way the stack suggests, and the ordering is written into the documents. Home service contracts commonly exclude, or decline to duplicate, anything covered by a manufacturer's warranty or another service agreement, and they exclude items still under a builder's warranty on the same reasoning. That is an allocation rule rather than a trap: the first payer is the manufacturer, and the service contract begins where the manufacturer's obligation ends. It does mean a service contract bought on one-year-old equipment buys less than it appears to.

Two consequences follow. A service contract carrying a waiting period and a per-visit trade service call fee is a worse remedy than a live manufacturer warranty on the same failure, so the manufacturer's document is the one to check first. Implied warranties — merchantability and fitness for a particular purpose, which state law supplies automatically and which the FTC notes may run up to four years depending on the state — are a separate layer that a limited warranty may restrict but a full warranty may not.

The window is the walkthrough and the first weeks

Nothing about a manufacturer's warranty is negotiated at closing, which is why it stays invisible in a transaction where everything else is explicit. There is no line on the settlement statement, no contingency, no disclosure duty and no professional whose job it is to raise it. The work falls to the buyer, in a window defined by access rather than by contract.

That window has two halves. The first is the inspection or option period and the final walkthrough, the only times a buyer is inside the house with the seller still motivated to cooperate. The second is the first several weeks of ownership, when registration is still open on recently installed equipment, when a transfer notice is still within its stated period, and when the seller's phone number still works.

The entitlement does not disappear because the buyer was wrong. It disappears because the buyer was late, judged against a date nobody announced. A one-page equipment inventory — make, model, serial, installation date, warranty terms, transfer requirement — assembled while the information is free converts an abstract right into a claim that can be filed.

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