For sauna distributors and project buyers, steam rooms are one of the most profitable lines you can add. [Demand from hotels, spas, gyms, and wellness centers keeps rising](https://insights.ehl.edu/the-wellness-economy)[^1][^1] — and a steam room generator carries good margins plus recurring sales in controls, nozzles, and accessories. As an official Harvia agent, we help buyers source the right steam systems for both residential and commercial projects.
But there's a catch that trips up a lot of buyers: a steam generator is not the same as a sauna heater, and choosing the wrong model — or the wrong version — leads to returns, complaints, and lost margin. This guide walks you through the Harvia steam generator range (HGS, HGX, HGD, and HGP), what makes a commercial steam generator different from a home unit, and how to stock and spec them correctly.
Why Steam Generators Are Worth Adding to Your Range
If you already sell sauna heaters, steam is the natural companion product — and often a higher-value one.
- Rising demand. [Spas, hotels, and gyms increasingly offer both dry sauna and steam (hammam) rooms](https://scholarworks.gvsu.edu/cgi/viewcontent.cgi?article=1069&context=jti)[^2][^2]. A steam generator for steam room installations is a standard spec item in modern wellness projects.
- Recurring revenue. Beyond the unit itself, each install needs a controller, steam nozzle, and often a fragrance pump and water treatment — repeat SKUs you can bundle.
- Premium positioning. An electric steam generator lets your customers offer a full wet-and-dry wellness suite, which commands higher room rates and membership fees for them — an easy upsell for you.
For a distributor, adding steam to your catalog is a low-effort way to raise order value per project. Browse the full range on our sauna steam generator page.
First, Know the Difference: Commercial vs Home Steam Generators
This is where buyers get it wrong. The key isn't just power — it's how hard the unit is built to run[^3].
| Home units (HGX, small HGS) | Commercial units (HGD, HGP, larger HGS) | |
|---|---|---|
| Usage | A few hours a day, private use | Long hours, back-to-back sessions |
| Build | Lighter-duty, cost-focused | Heavy-duty tanks and elements for continuous run |
| Water handling | Basic | Auto-drain, scale cups, water-quality tolerance |
| Best for | Homes, apartments, light use | Hotels, spas, gyms, public facilities |
Stocking rule of thumb: for private homes, an HGX or entry HGS is fine. For any high-use or public project, always spec a commercial-grade unit (HGD or HGP). Under-specifying a home unit into a busy spa is the number-one cause of failures and warranty claims.
Which Harvia Steam Generator Should You Stock? Start Here
Before the full spec tables, here's the fast way to decide what to carry. As a distributor, you don't need to memorize every model — you need to know which series fits which project, then match the exact model when you quote. This shortcut does the first part:
| If your customer's project is… | Stock / quote… | Why |
|---|---|---|
| A home steam shower (private, looks matter) | HGX | Slim, wall-mounted, premium in a small space |
| A mid-size commercial or high-end residential room | HGS | The reliable all-rounder — your safest default |
| A spa or hotel running long hours daily | HGD | Bigger tank built for continuous duty |
| A large hammam, commercial spa, or public facility | HGP | High steam output for heavy, non-stop use |
Once you've picked the series, use the tables below to spec the exact model. The full power, steam-output, and room-size figures are there so you can quote projects accurately. Rule of thumb: the bigger and busier the room, the more power and steam output you need — and rooms full of tile, stone, or glass should be sized up[^4].
Harvia HGX — For Home Steam Showers
Quote HGX when the project is a private steam shower and appearance matters. It's slim, wall-mounted, and hides neatly into a bathroom — the version end users love. Requires an external controller.
| Model | Power (kW) | Room range (m³) |
|---|---|---|
| HGX2 | 2.2 | Small shower cabins |
| HGX45 | 4.5 | 2–7 |
| HGX60 | 5.7 | 2.5–11 |
| HGX90 | 9.0 | 4.5–17 |
| HGX11 | 10.8 | 6–21 |
| HGX15 | 15.0 | 8–28 |
Slim body: 600 × 155 × 320 mm; 9 kg empty / 13 kg full. Full details on the Harvia HGX product page.
Harvia HGS — The Safe Default for Most Jobs
If you're unsure what to stock, stock HGS. It's the reliable workhorse covering most small-to-mid commercial rooms and quality home installs, available with built-in or external control.
| Model | Power (kW) | Steam output (kg/h) | Room range (m³) |
|---|---|---|---|
| HGS45 | 4.5 | 5.5 | 2–7 |
| HGS60 | 5.7 | 7.6 | 2.5–11 |
| HGS90 | 9.0 | 12.0 | 4.5–17 |
| HGS110 | 10.8 | 14.6 | 6–21 |
Dimensions: 520 × 196 × 411 mm. See the Harvia HGS product page.
Harvia HGD — When Spas and Hotels Run All Day
Step up to HGD when the room runs long hours every day. The bigger water tank and front-access servicing are built for spa and hotel duty — the sweet spot between the HGS and the largest units.
| Model | Power (kW) | Steam output (kg/h) | Room range (m³) |
|---|---|---|---|
| HGD45 | 4.5 | 5.5 | 2–7 |
| HGD60 | 5.7 | 7.6 | 2.5–11 |
| HGD90 | 9.0 | 12.0 | 4.5–17 |
| HGD110 | 10.8 | 14.6 | 6–21 |
| HGD150 | 15.0 | 20.1 | 8–28 |
Dimensions: 460 × 210 × 435 mm. See the Harvia HGD product page.
Harvia HGP — The Heavy Hitter for Big Commercial Projects
For large hammams and public wellness facilities, HGP delivers the high steam output these rooms demand, with a scale-collection cup and optional fragrance pump for easy upkeep. All HGP units run on three-phase power.
| Model | Power (kW) | Steam output (kg/h) | Room range (m³) |
|---|---|---|---|
| HGP22 | 21.6 | 29.2 | up to ~42 |
| HGP30 | 30.0 | 40.2 | up to ~56 |
Dimensions: 560 × 320 × 490 mm; 24 kg empty / 133 kg full. See the Harvia HGP product page.
Three Things Buyers Get Wrong When Ordering
You don't need to be the installer — but knowing these three points stops the most common ordering mistakes.
- Sizing for surfaces, not just volume. Steam rooms with lots of hard, cold surfaces (stone, tile, glass) absorb heat, so they need more power than the raw room volume suggests. When in doubt, size up. A quick way to sanity-check output is our sauna heater size guide — the same "match power to room" logic applies.
- Voltage and phase. [Small units run on single-phase (230V); larger commercial units (and all HGP) need three-phase (400V)](https://device.report/manual/5868992)[^5][^3]. Confirm the site's supply before ordering, or the unit can't be commissioned.
- It's a system, not just a box. [Every steam generator needs a controller and steam nozzle](https://www.youtube.com/watch?v=fs8Jni4OKLs)[^6][^4], and most benefit from a fragrance pump and water-treatment/auto-drain. Bundling these as one order is exactly where one-stop procurement saves your customer time and cuts your after-sales risk.
A Quick Sourcing Checklist
- Match the series to the use case — home (HGX/HGS) vs commercial (HGD/HGP).
- Confirm voltage/phase for the destination site.
- Include the accessories — controller, nozzle, fragrance pump, water treatment.
- Check certification you need for customs and safety in your market.
- Mind water quality — hard water damages tanks over time[^7]; recommend a softener where needed.
For a broader framework on vetting products and suppliers, see what to look for when buying a commercial sauna.
Frequently Asked Questions
What size commercial steam generator do I need for a project? Match steam output to room volume and surface materials. As a guide, an HGS90/HGD90 (9 kW, 12 kg/h) suits mid-size rooms around 4.5–17 m³, while high-output units like the HGP30 (30 kW, 40.2 kg/h) cover large commercial rooms up to roughly 56 m³. Rooms with lots of stone, tile, or glass need extra power.
Can I supply Harvia steam generators with custom branding or in bulk? Yes. As an official Harvia agent with OEM/ODM capability, we support private-label and bulk project orders, with a minimum order quantity from a single container and consolidated shipping to keep freight costs down.
Where is the steam generator installed — inside the steam room? No. The generator is installed outside the room in a dry, ventilated space and pipes steam in through a nozzle, ideally within a short pipe run. This is a key point to confirm with your customers so they plan the installation space correctly.
Conclusion
Harvia's steam range covers every project — from the compact HGX for home showers to the high-power HGP for large commercial hammams — making it an easy, profitable line to add to your catalog.
Need help matching models to your next order? Contact us for a quick recommendation and quote — and don't worry about shipping, as an official Harvia agent we handle reliable export logistics to 50+ countries, with MOQ from a single container.
About ROC Sauna-Solution: We are a professional sauna supplier from China and an official Harvia agent, with 12+ years of OEM/ODM experience and CE/ETL-certified quality. We supply the full range of commercial and residential sauna products — heaters, steam generators, infrared units, solid-wood panels, accessories, and controls — to SPA chains, hotel developers, and brand operators in 50+ countries. Learn more at ROC's website.
[^1]: "The Wellness Economy: Definition, Size, and What's Driving Its Growth", https://insights.ehl.edu/the-wellness-economy. A tourism or wellness-economy source documents growth in wellness-oriented travel and hospitality services, supporting the broader demand context for steam-room installations. Evidence role: statistic; source type: institution. Supports: Demand from hotels, spas, gyms, and wellness centers for wellness amenities including steam rooms is rising.. Scope note: Such sources usually measure wellness tourism or spa-sector growth rather than steam-generator purchases directly. [^2]: "U.S. Resort Spa Offerings: A State of the Industry Report", https://scholarworks.gvsu.edu/cgi/viewcontent.cgi?article=1069&context=jti. A hospitality, spa, or wellness-facility source describes sauna and steam or hammam rooms as common wellness amenities, providing contextual support for their inclusion in modern spa and hotel projects. Evidence role: general_support; source type: institution. Supports: Spas, hotels, and gyms increasingly offer both dry sauna and steam or hammam rooms.. Scope note: The source may show that these amenities are common or growing in wellness facilities, not that every spa, hotel, or gym offers both. [^3]: "Residential Steam Shower Guides & Specs", https://www.mrsteam.com/residential-guides-specs/. Manufacturer installation or technical documentation distinguishing residential-duty and commercial-duty steam generators by intended operating conditions would support the claim that duty cycle, not only rated power, is a key selection criterion. Evidence role: mechanism; source type: other. Supports: Commercial and home steam generators differ by intended duty cycle and operating load, not only by power rating.. Scope note: Manufacturer documentation is primary technical evidence and may not independently quantify failure risk. [^4]: "Steam Generator Sizing Guide | How to Choose the Right kW", https://primeregeneration.com/pages/steam-generator-sizing-tips?srsltid=AfmBOoqjKLYJqkySSTxPeo1uQcHw24bisnERVGBVxWP6ocX9n7-w79Tc. A steam-room sizing guide or building-physics source explaining that high thermal-mass or poorly insulated surfaces increase heating load would support the recommendation to increase generator capacity for tile, stone, or glass rooms. Evidence role: mechanism; source type: education. Supports: Steam rooms with tile, stone, or glass surfaces often require higher generator capacity than volume alone suggests.. Scope note: Sizing multipliers may vary by manufacturer and room construction, so the evidence supports the principle rather than a single universal rule. [^5]: "HARVIA HGP22 Helix Steam Generator Instruction Manual", https://device.report/manual/5868992. Electrical specifications in the relevant steam-generator manuals would support the stated voltage and phase requirements for small and high-output Harvia models. Evidence role: definition; source type: other. Supports: Small steam-generator models may use single-phase 230 V supply, while larger commercial models such as HGP require three-phase 400 V supply.. Scope note: The exact voltage and phase can vary by market and model variant, so the citation should be tied to the applicable regional specification sheet. [^6]: "How to Install a Delta® SimpleSteam Kit - YouTube", https://www.youtube.com/watch?v=fs8Jni4OKLs. A steam-generator installation manual specifying the required control unit and steam nozzle would support the statement that these components are necessary parts of a complete installation. Evidence role: definition; source type: other. Supports: A steam generator installation requires a controller or control interface and a steam nozzle.. Scope note: Some models may include a built-in control panel or bundled accessories, so the support should be model-specific rather than universal across all brands. [^7]: "[PDF] Home Water Softening - WSU Research Exchange", https://rex.libraries.wsu.edu/esploro/fulltext/report/Home-Water-Softening/99900501901901842?repId=12332640920001842&mId=13332983430001842&institution=01ALLIANCE_WSU. A water-quality or engineering source explaining that hard water forms mineral scale in heated water equipment would support the warning that hard water can damage or reduce the service life of steam-generator tanks. Evidence role: mechanism; source type: government. Supports: Hard water can damage steam-generator tanks over time through mineral scaling.. Scope note: The source may discuss scale formation in boilers or water heaters generally, which is mechanistically applicable but not direct failure data for Harvia tanks.
