# Sauna Manufacturers: How to Choose a Sauna Supplier

Source: https://www.mars-sauna-room.com/guides/how-to-choose-a-sauna-manufacturer/

Published 2026-10-16, updated 2026-10-20.

To choose among sauna manufacturers, verify safety listings for your market in the testing lab's own directory, confirm where the heaters come from and what they are rated at, inspect wood species and grade, and ask for the factory's quality control records before ordering samples. A supplier that answers those questions with documents rather than adjectives is the one to shortlist.

This guide is written for distributors, retailers, hotel and gym buyers, and brand owners comparing sauna companies, from infrared sauna manufacturers to traditional heater and steam room manufacturers.

## What kinds of sauna companies are there?

Not every sauna supplier makes saunas. Knowing which type you are talking to tells you who controls quality and who can change a spec.

| Supplier type | What they do | Strengths | Watch for |
|---|---|---|---|
| Manufacturer (factory) | Mills wood, builds panels, installs heaters and wiring | Direct control of specs, OEM changes, pricing | Minimum order sizes, need to manage logistics |
| Heater or component maker | Makes infrared panels, electric stoves or controls | Deep component expertise | Does not build cabins |
| Trading company | Buys from several factories and exports | Wide range, consolidated shipping | Less control; certificates may belong to the factory |
| Brand or private-label seller | Sells under its own brand, sourced from factories | Marketing, local support | Limited spec changes, higher unit cost |
| Local distributor | Stocks and installs | Fast delivery, service | Markup, limited customization |

Ask directly: "Do you own the factory where this model is assembled?" and "Who manufactures the heaters?"

## How to vet sauna manufacturers: a 10-point checklist

1. **Safety listings for your market.** Ask for the listing or certificate number and model numbers covered, then check them yourself.
2. **Heater sourcing and specs.** Know whether heaters are made in-house or bought in, their wattage, type (carbon, ceramic, full spectrum, electric stove) and EMF data if claimed.
3. **Wood species and grade.** Confirm species (for example Canadian hemlock or western red cedar), grade, moisture content at milling and whether benches are knot-free.
4. **Glues and composite parts.** Any plywood, MDF or particleboard sold into the US must meet [EPA TSCA Title VI formaldehyde rules](https://www.epa.gov/formaldehyde/formaldehyde-emission-standards-composite-wood-products), including labeling.
5. **Voltage and plugs.** Get 110-120V or 220-240V builds that match your market, with correct plugs, cords and labels.
6. **Quality control.** Ask for incoming material checks, in-line inspections and final electrical tests, such as hi-pot and ground continuity, per unit.
7. **Samples.** Order at least one sample of each model you plan to sell, and test-heat it for several hours.
8. **Packaging.** Check carton strength, corner protection and labeling for warehouse and last-mile delivery.
9. **Documentation.** Manuals, wiring diagrams, spare-parts lists and exploded drawings in your market's language.
10. **Communication and after-sales.** Response time, a named contact, and how warranty parts are handled.

For the logistics side, our [guide to importing saunas from China](/guides/import-saunas-from-china/) covers incoterms, inspections and shipping.

## Which certifications matter, and how do you verify them?

Certifications are where buyers most often get caught out. A certificate may cover a different model, a different factory or a component rather than the finished sauna.

### United States and Canada

In the US, electrical products used in workplaces are tested by labs recognized under [OSHA's Nationally Recognized Testing Laboratory (NRTL) program](https://www.osha.gov/nationally-recognized-testing-laboratory-program); ETL and UL marks are two common examples. Electric sauna heaters are evaluated to [UL 875](https://webstore.ansi.org/standards/ul/ul875ed102024), the standard for electric dry-bath heaters, which reached its 10th edition in 2024. Some codes reference it directly: [California Mechanical Code 939.1](https://gocodebook.com/library/us/ca/ca-mechanical-code/chapter-9-installation-of-specific-appliances/939.1-electric-sauna-heaters.-sauna-heaters-shall-comply-with-ul-875-and-shall-be-installed-in-a) requires sauna heaters to comply with UL 875.

Ask for the listing file number, then search the lab's online directory to confirm the manufacturer name, factory location and model numbers. A heater component listing is not the same as a listing of the complete cabin.

### Europe and other IEC markets

For the EU, the manufacturer must carry out the conformity assessment, keep a technical file, issue the EU declaration of conformity and affix [CE marking](https://single-market-economy.ec.europa.eu/single-market/ce-marking_en). The European Commission notes that importers and distributors must make sure products they place on the market carry CE marking and meet EU rules, so the responsibility does not end with the factory. The relevant safety standard is usually [IEC 60335-2-53](https://webstore.iec.ch/en/publication/68677) (or its EN equivalent), which covers sauna heaters and infrared cabins up to 20 kW. A 2026 edition of that standard has been published, so ask which edition test reports cite.

### Quality systems

[ISO 9001](https://www.iso.org/iso-9001-quality-management.html) is the best-known standard for quality management systems. A certificate shows the factory runs a documented system; it does not certify individual products. If a supplier claims ISO 9001, ask for the certificate, the certification body and its scope.

| Market | What to request | How to verify |
|---|---|---|
| US | NRTL listing (e.g. ETL or UL) for heater and cabin; UL 875 for electric heaters | Lab's online listing directory |
| Canada | Listing with a Canadian mark (often c-ETL-us or cUL) | Same directory, check Canadian scope |
| EU / UK | EU declaration of conformity, test report to EN/IEC 60335-2-53 | Report number with test lab; check model list |
| Any | TSCA Title VI labels on composite wood (US) | Label and certifier details |
| Any | ISO 9001 certificate if claimed | Certification body's register |

## Questions to ask about heaters and EMF

The heater is the most technical part of an infrared sauna, and the main reason to look closely at an infrared sauna manufacturer or sauna heater manufacturer.

- What heater types are offered: carbon fiber, low-EMF carbon, ceramic, red glass full spectrum, or electric stove?
- What is the wattage per panel and total, and what supply does that require?
- If low EMF is claimed, at what distance and with what meter was it measured, and can you see the test report? Our [low-EMF sauna heaters](/guides/low-emf-sauna-heaters/) guide explains what the numbers mean.
- What operating temperature range does the control panel allow?
- For traditional saunas, which heater is fitted and what is its listed maximum room volume?

For steam room manufacturers, ask the same questions about the steam generator, plus water connections, drain requirements and enclosure materials.

## Can a sauna be "Made in USA"?

Searches for "sauna made in USA" are common, and buyers should understand the rule. The FTC's guidance on the [Made in USA standard](https://www.ftc.gov/business-guidance/resources/complying-made-usa-standard) says an unqualified claim requires the product to be "all or virtually all" made in the US, with final assembly and significant processing in the US and negligible foreign content. The FTC's Made in USA Labeling Rule, finalized in 2021, allows civil penalties for unqualified labels that do not meet that standard.

A sauna with imported heaters, glass or panels may only qualify for a qualified claim such as "Assembled in USA" or a stated percentage of US content. If you are a brand owner, keep origin claims accurate on packaging and listings, whatever country your supplier is in.

## How OEM sauna manufacturing works

An OEM sauna is built by the factory and sold under your brand. A typical OEM or ODM project runs like this:

1. **Brief.** Target market, voltage, sizes, heater type, wood and price position.
2. **Spec sheet and drawings.** The factory proposes a bill of materials and drawings.
3. **Samples.** First samples are built and tested; you review finish, heat-up and controls.
4. **Certification.** Listings are extended or updated for your brand and any construction changes.
5. **Packaging and labels.** Branded cartons, manuals and rating labels.
6. **Production and inspection.** In-line checks, then pre-shipment inspection against an agreed list.
7. **Shipping.** Container loading planned by carton dimensions; the [container load calculator](/tools/container-calculator/) estimates how many units fit.

Mars Sauna, a China-based manufacturer and exporter with 213 catalogue models across 9 product lines, offers [OEM and ODM manufacturing](/oem-odm/) covering wood, heaters, size, voltage, control panel, logo and packaging. You can see how cabins are built and checked on our [factory and quality checks](/factory/) page.

## Red flags when choosing a sauna supplier

- Certificates with a different company name, address or model list
- "CE" or "ETL" claimed with no report or listing number
- Unwilling to send samples or allow inspections
- Vague answers on heater origin or wood species
- Low-EMF or health claims with no test data
- No wiring diagrams or spare-parts list
- Prices far below comparable factories with no explanation

For hotels, gyms and spas, also check commercial duty ratings; see the [commercial sauna buying guide](/guides/commercial-sauna-buying-guide/). When you are ready to compare specifications and lead times, [request a quote](/contact/) with your target models, market and quantities.

## Key takeaways

- Separate true sauna manufacturers from trading companies and private-label brands, and ask who builds the heaters.
- Verify every safety listing in the testing lab's directory; US heaters are evaluated to UL 875, and EU products need CE marking with a declaration of conformity.
- Check wood species and grade, composite-wood compliance and EMF test data, not just marketing claims.
- Order samples, test-heat them and agree an inspection checklist before production.
- "Made in USA" claims must meet the FTC's all-or-virtually-all standard.
- OEM projects should include certification updates, branded labels and planned container loading.

## FAQ
### How do I choose a sauna manufacturer?
Choose a sauna manufacturer by verifying four things: safety listings for your market that you can confirm in the testing lab's directory, the source and specs of the heaters, the wood species and grade, and a documented quality control process. Then order samples, check packaging and confirm voltage, plugs and labels before committing to a production run.

### What certifications should an infrared sauna manufacturer have?
An infrared sauna manufacturer selling into the US should supply products listed by an OSHA-recognized testing laboratory, often shown as ETL or UL marks, typically to UL 875 for heaters. For Europe, products need CE marking with an EU declaration of conformity, commonly referencing IEC or EN 60335-2-53. Ask for certificate numbers and verify them yourself.

### What is an OEM sauna?
An OEM sauna is a model built by a manufacturer and sold under another company's brand. In OEM, the buyer specifies changes to an existing design, such as logo, wood, heater type, voltage, control panel and packaging. In ODM, the factory also develops a new design. Certifications usually need to be updated when the brand or construction changes.

### Can a sauna be labeled Made in USA if parts are imported?
Only if it meets the FTC standard that the product is all or virtually all made in the US. Under the FTC Made in USA Labeling Rule finalized in 2021, final assembly must be in the US and foreign content must be negligible. A sauna with imported heaters or panels may need a qualified claim such as Assembled in USA.

### What is the difference between a sauna manufacturer and a sauna supplier?
A sauna manufacturer owns the factory that cuts the wood, builds the panels and installs the heaters. A sauna supplier may be the manufacturer, a trading company that buys from factories, or a brand that sources private-label models. Buying direct from the factory usually gives more control over specs, while traders may offer wider ranges.

### Should I visit a sauna factory before ordering?
Visiting or auditing a sauna factory before a large first order is strongly recommended. An in-person visit, a video audit or a third-party inspection lets you check wood storage and drying, heater installation, wiring, electrical testing and packaging. For later orders, a pre-shipment inspection against an agreed checklist is usually enough.


## Sources
- [OSHA: Nationally Recognized Testing Laboratory (NRTL) Program](https://www.osha.gov/nationally-recognized-testing-laboratory-program)
- [ANSI Webstore: UL 875 Ed. 10-2024, Electric Dry-Bath Heaters](https://webstore.ansi.org/standards/ul/ul875ed102024)
- [IEC 60335-2-53: Sauna heating appliances and infrared cabins](https://webstore.iec.ch/en/publication/68677)
- [European Commission: CE marking](https://single-market-economy.ec.europa.eu/single-market/ce-marking_en)
- [FTC: Complying with the Made in USA Standard](https://www.ftc.gov/business-guidance/resources/complying-made-usa-standard)
- [US EPA: Formaldehyde emission standards for composite wood products (TSCA Title VI)](https://www.epa.gov/formaldehyde/formaldehyde-emission-standards-composite-wood-products)
- [ISO: ISO 9001 Quality management](https://www.iso.org/iso-9001-quality-management.html)
- [California Mechanical Code 939.1: Electric sauna heaters](https://gocodebook.com/library/us/ca/ca-mechanical-code/chapter-9-installation-of-specific-appliances/939.1-electric-sauna-heaters.-sauna-heaters-shall-comply-with-ul-875-and-shall-be-installed-in-a)