An ODM, or Original Design Manufacturer, is a company that designs and manufactures a product itself, then supplies it to other businesses to sell under their own brand. The buyer selects an existing design and customises elements such as branding, colour, and packaging, rather than developing a product from scratch.
This distinguishes it from OEM, or Original Equipment Manufacturer, where the buyer brings their own design and the manufacturer builds to that specification. The difference comes down to one question: who owns the design?
OEM and ODM: The Core Difference
Both terms describe contract manufacturing, and both are widely used, which is why they are so often confused. Keeping the distinction clear makes every subsequent decision easier.
OEM. You have a design, whether developed in house or by a design consultancy. The manufacturer builds it to your specification. The intellectual property is yours, the product is distinctive to you, and the development cost and timeline are also yours.
ODM. The manufacturer has already developed and certified a product. You select it, adapt the branding and certain parameters, and sell it under your name. Development is already done, so you reach market faster and at lower cost, but the underlying design is not exclusive to you.
| Aspect | OEM | ODM |
|---|---|---|
| Who owns the design | The buyer | The manufacturer |
| Development cost | Borne by the buyer | Already absorbed by the manufacturer |
| Time to market | Longer, includes development and certification | Shorter, product already exists |
| Certification | May require new testing | Usually already held |
| Exclusivity | The design is yours alone | Similar products may exist elsewhere |
| Minimum order quantity | Typically higher | Typically lower |
| Best suited to | Distinctive requirements, R&D capacity | Fast market entry, limited R&D budget |
A correction worth making, because the reverse is often stated. ODM is the appropriate route when your R&D budget is limited, since the design work has already been done and paid for by the manufacturer. OEM requires you to bring a design, which means you must have developed it, which requires R&D investment. If limited development capacity is your constraint, ODM is the answer rather than OEM.
Which Route Should You Choose?
Four questions settle most cases, and working through them in order avoids the common mistake of choosing on price alone.
1. Do you have a design, or a specification?
These are different things. A design is a complete engineered product ready to manufacture. A specification is a list of requirements the product must meet.
If you have a design, OEM applies. If you have a specification, an ODM manufacturer will tell you which of their existing products meets it, and frequently one already does. Many buyers who think they need custom development find that a standard product plus parameter adjustment covers their requirement entirely.
2. How distinctive does the product need to be?
If the product itself is your competitive position, and a similar item under a competitor’s brand would undermine you, OEM development protects that. If you compete on service, distribution, market knowledge, or price, the underlying design matters less and ODM removes an unnecessary cost.
3. What is your timeline?
ODM reaches market considerably faster because development and certification already exist. OEM development adds design time, prototyping, testing, and certification, which for a regulated product can be substantial.
4. What volume are you starting at?
OEM development costs must be recovered across the units you sell, so low volumes make the per-unit development burden heavy. ODM spreads that cost across every customer buying the same base product, which is why minimum orders are usually lower.
What ODM Customisation Actually Covers
Buyers frequently underestimate the scope available under ODM and assume it means a logo and nothing more. In practice the adjustable range is wider than that, though it varies considerably between manufacturers.
Branding. Logo, nameplate, product labelling, and packaging under your own brand. This is the baseline every ODM supplier offers.
Appearance. Housing colour and finish, and in some cases display language and interface layout. For products with a visible installed position, this matters commercially as well as visually.
Configuration. This is where the real difference between suppliers appears. A manufacturer who controls the firmware can set operating parameters, default values, and behaviour to suit your typical installation, so every unit arrives configured for your market rather than requiring adjustment on site.
Specification within a range. Connection sizes, voltage options, capacity within the existing platform, and material choices where the design permits.
Documentation. Installation manuals, technical datasheets, and certification papers under your brand, which matters more than it sounds since a clear manual in your customer’s language reduces support calls.
The question that reveals what a supplier can actually do. Ask whether they can change a firmware parameter or a switching temperature at the source. A manufacturer who controls their own production and component design can. A trading company reselling someone else’s product cannot, and the answer usually arrives after a delay while they check with a third party.
The Honest Trade-Offs
ODM is not without disadvantages, and being clear about them helps rather than hinders the decision.
Differentiation is harder. Because the underlying design is available to others, similar products may appear under competing brands, sometimes in the same market. Competing on the product alone becomes difficult, and price competition often follows, compressing margins.
The response is to compete on something the design does not determine: distribution reach, technical support, market knowledge, installation service, or the completeness of the system you supply rather than the individual component.
You do not own the design. If the relationship ends, the product does not come with you. Buyers building a long-term brand around a specific product should establish what happens in that scenario before committing.
Exclusivity requires negotiation. Some manufacturers offer regional or sector exclusivity on particular configurations, but it is rarely automatic and should be raised early rather than assumed.
Your fate is tied to theirs. If the manufacturer discontinues a model, your customers still expect matching replacements. Asking about model continuity before ordering addresses a risk that only appears years later.
ODM in HVAC Manufacturing
The general principles apply across industries, but a few considerations are specific to technical products in regulated markets, and they change what matters when selecting a partner.
For HVAC components, certification is not a formality. CE marking, RoHS compliance, WRAS or ACS approval for products contacting drinking water, and standards such as EN 60730 for electrical controls all require testing and documentation.
An ODM product carrying existing certification removes that cost and timeline entirely. An OEM development requires the buyer to fund testing for a product nobody has certified before, and for a regulated component that can exceed the tooling cost.
Two things to confirm: that certification covers the specific model and configuration you are ordering rather than the manufacturer’s range generally, and that test documentation can be supplied for your own regulatory submission.
Component-level control changes what is customisable
In HVAC, many products depend on a subcomponent that determines their behaviour. A thermostatic valve’s switching temperature is set by the wax element inside it. A thermal actuator’s response depends on the same. A thermostat’s control accuracy depends on its sensor.
A manufacturer producing those subcomponents in house can specify their characteristics at the source, which means customisation reaches deeper than branding. One buying them on the open market can only select from what is available.
System compatibility
Components rarely work alone. A thermostat drives an actuator on a manifold. A heat pump feeds a distribution system. Sourcing across several suppliers means compatibility must be verified rather than assumed, and mismatches surface during installation rather than during procurement.
Where a single manufacturer produces the whole chain, that verification is built in, which removes an entire category of problem.
How to Evaluate an ODM Partner
Establish whether they manufacture or trade. Ask what production stages are in house and what equipment they own. A factory can describe its assembly, testing, and quality processes specifically. A trading company answers vaguely because it does not have them.
Ask for the full technical datasheet. Not a summary, not a brochure. A supplier who expects technical scrutiny provides it without hesitation, and how they respond tells you what support will look like after purchase.
Request samples and test them yourself. Standard practice in professional procurement, and a manufacturer confident in their product will not resist. Test in your own conditions, with your own adjacent equipment, in the configuration your customers will use.
Confirm certification for your market. Per model, not per range, and with documentation you can obtain a copy of.
Ask about continuity and spare parts. Your customers will need matching replacements years from now. A supplier who cannot speak to model continuity may leave you with an installed base you cannot service.
Clarify who owns any customisation you fund. If you pay for a custom housing or firmware configuration, establish in writing whether the supplier may offer it to others. This is a straightforward conversation before an order and an awkward one afterwards.
“The confusion between OEM and ODM costs buyers real money, because the two suit opposite situations. If you have limited development capacity, ODM is your route: the design exists, the certification exists, and you are buying a shortcut past both. If you go looking for an OEM partner in that position you are asking someone to build a design you do not have. The other thing I would say is that people underestimate how much can be adjusted under ODM. When we set firmware defaults for a partner, every unit arrives configured for their installations rather than needing adjustment on site. That is not a logo change. But it only works if the manufacturer controls their own production.”
— Maggie Shen, Director of Legom
Working with Legom
Legom manufactures HVAC and underfloor heating components at its own facility in Jiaxing, Zhejiang Province, supplying partners in more than 90 countries through over 400 active relationships.
The range covers wax thermostatic elements, thermal actuators, room thermostats, heat pumps, manifolds, floor heating pipe, and HVAC valves. Because the wax elements inside the valves and actuators are produced in the same facility rather than sourced externally, switching characteristics can be specified at the source rather than selected from what the market offers.
OEM and ODM services cover model selection against your requirements, firmware and parameter configuration, housing colour and branding, packaging and documentation, sampling and approval before production commitment, and production batch test records. All projects are handled under confidentiality agreement.
For a fuller treatment of supplier evaluation, see our guide to choosing an OEM thermostat manufacturer.
Frequently Asked Questions
What is ODM?
ODM stands for Original Design Manufacturer, a company that designs and manufactures a product itself, then supplies it to other businesses to sell under their own brand. The buyer selects an existing design and customises elements such as branding, colour, packaging, and configuration parameters, rather than developing a product from scratch. The defining characteristic is that the manufacturer owns the design rather than the buyer.
What is the difference between OEM and ODM?
Who owns the design. Under OEM, the buyer brings their own design and the manufacturer builds to that specification, so the intellectual property and the development cost belong to the buyer. Under ODM, the manufacturer has already developed and certified the product, and the buyer adapts it. OEM produces something distinctive at higher cost and longer timeline. ODM reaches market faster and cheaper, but the underlying design is not exclusive.
Which is better for a limited R&D budget?
ODM, without question. The design work and certification have already been done and paid for by the manufacturer, so you are effectively buying a shortcut past both. OEM requires you to bring a design, which means you must have developed it, which requires exactly the R&D investment you are trying to avoid. This is a point frequently stated in reverse, and getting it wrong sends buyers looking for the wrong kind of partner.
Is ODM the same as white label or private label?
They overlap substantially. White label and private label both describe selling a manufacturer’s existing product under your own brand, which is what ODM delivers. The term ODM emphasises the manufacturing relationship and usually implies a degree of customisation beyond branding, such as configuration parameters, colour, and specification within the existing platform. In practice the terms are often used interchangeably.
What can actually be customised under ODM?
More than most buyers assume, though it varies by manufacturer. Branding, packaging, and documentation are the baseline. Beyond that, housing colour and finish, display language and interface layout, connection sizes and voltage options within the platform, and firmware parameters and default values. That last one is where suppliers differ most: a manufacturer controlling their own firmware can set defaults so every unit arrives configured for your installations, while a reseller cannot.
What are the disadvantages of ODM?
Differentiation is harder, since similar products may appear under competing brands, which invites price competition and compresses margins. You do not own the design, so it does not come with you if the relationship ends. Exclusivity requires negotiation rather than being automatic. And if the manufacturer discontinues a model, your customers still expect matching replacements, so model continuity is worth establishing before you commit.
How do I know if a supplier is a real manufacturer?
Ask what production stages are in house and what equipment they own, since the answer is specific and difficult to fabricate. Ask a question that requires production-line access, such as changing a firmware parameter or a switching temperature, and note whether the answer comes directly or after a delay. Request production photographs of the actual product rather than generic factory imagery, and request samples for your own inspection.
Why does certification matter so much in ODM?
Because for technical products in regulated markets it represents the largest hidden cost of the alternative. HVAC components require CE marking, RoHS compliance, WRAS or ACS approval for potable water contact, and standards such as EN 60730 for electrical controls, each involving testing and documentation. An ODM product carrying existing certification removes that entirely. Confirm the certificate covers your specific model and configuration, and that documentation can be supplied for your own regulatory submission.
Reviewed by Maggie Shen, Director at Legom, on August 25, 2026. This guide to ODM manufacturing was reviewed for accuracy, including the corrected distinction between OEM and ODM design ownership and which route suits limited development capacity.