What Changes in Your Business When You Add a Sauna Line?

Key Takeaways

• A sauna line changes four parts of your business before your turnover: install crew, electrician, storage, winter service.

• Saunas have fewer moving parts than a hot tub. The risk moves into timber, moisture and electrics.

• Glass drives heater size. Harvia treats 1 m² of glass as the equivalent of 1.2 m³ of room volume.

• Under Regulation (EU) 2023/988, putting your own name on a sauna makes you its manufacturer in law.

• In what our own partners order, sauna demand runs opposite to pool season: stronger in the colder half of the year.

• No trusted electrician and no covered storage are the two conditions that make a sauna line a warranty queue.

Adding saunas to your range changes your operations before it changes your turnover. We build outdoor saunas in KlaipÄ—da and ship them to partners across Europe, so we see which dealers are ready and which find the gaps in their first winter. By the end of this article you'll know the four parts of your business a sauna line touches, and the two conditions that mean you should wait.

What Changes in Your Business When You Add a Sauna Line?

Adding a sauna line changes four parts of your business: who installs, who wires, where you store, and when the phone rings. The product is simpler than what you already sell. A well-built outdoor sauna has no pumps, no filtration and no water chemistry. What replaces that complexity is timber that moves, moisture that finds every gap, and a fixed electrical connection that in most European markets has to be made and certified by a registered electrician rather than your own fitter. The revenue also lands in the opposite half of your year.

The first three you can plan for. The fourth is the one dealers underestimate.

Isn't a sauna just a simpler hot tub?

On paper, yes. A hot tub is a plumbed appliance with pumps, a filter circuit and water you keep stable all year. A sauna has a cabin, a stove and a door. Take out the water and you take out most of the service calls you make today.

That's the half of the comparison dealers get right.

Water chemistry is recurring and predictable, and you already staff for it. Timber and electrics aren't. They're episodic, they cluster in the cold months, and they land on people never trained for them. A hot tub fitter knows levels, falls and connections. A sauna asks whether the base is drained, whether the panels sit true, and whether the door still closes after the first freeze-thaw cycle.

Your crew changes shape too. A sauna is a lifting job, not plumbing. Our barrel range runs from 2 to 6 m, and at the top of it you're planning access rather than delivery.

Then the electrical work. On a hot tub it's a known quantity. On an outdoor sauna it varies, driven by something you'd never guess from the brochure.

The glass.

What actually decides the electrical work on a sauna?

Heater output. And that's decided by the room, not the model name.

Harvia publishes the rule its own network uses: an average of 1 kW per cubic metre of sauna volume. Then comes the part that matters for panoramic cabins. One square metre of stone, glass or similar non-insulated surface increases the power requirement as much as if the room volume were increased by 1.2 m³, and for non-insulated log walls the factor is 1.5 (Harvia support documentation, accessed July 2026).

Run that for two identical cabins. Start with 8.0 m³ of internal volume. A solid-walled cabin with a 0.4 m² door window calculates at 8.0 + 0.5, so 8.5 m³, and you specify around 9 kW. Now glaze the front. A panoramic front of 2.5 m² calculates at 8.0 + 3.0, so 11.0 m³, and you specify around 11 kW.

Same footprint. Same customer. A materially different electrical job.

That figure decides the cable, the protective device, and whether the customer's supply carries it or needs a three-phase connection. EN 60335-2-53, the standard covering these appliances, runs to a 20 kW rated input at not more than 250 V single-phase and 480 V otherwise. Plenty of headroom in the standard. Not always in the customer's meter cabinet.

That single heater specification is the clearest answer to what changes in your business when you add a sauna line.

Which responsibilities move to you when you resell a sauna?

Three, and none are optional.

First, product safety. The EU General Product Safety Regulation, Regulation (EU) 2023/988, has applied since 13 December 2024. Article 12 requires distributors to verify that a product carries its identification and the manufacturer's contact details. Article 13 goes further. Place a product on the market under your own name or trademark and you're deemed to be the manufacturer.

Read that twice if you were planning a private label.

Second, conformity to the household. Under Directive (EU) 2019/771 the seller is liable to the consumer for a lack of conformity that becomes apparent within two years of delivery. The seller is you. Whatever the factory owes you sits in a separate contract.

Third, documentation. The technical file and declarations have to exist and reach the end customer. If you're unsure what your supplier owes you, our note on what CE marking on a sauna actually covers sets out the document side.

What do the first 12 months of a sauna line look like?

Inverted, compared with the year you run now.

Harvia describes the sauna market as showing slightly stronger demand in the early and late part of the year and lower demand during the summer months, on a market that has historically grown by an average of 5% a year (Harvia Plc, markets and operating environment, accessed July 2026).

Enquiries build through autumn while your pool business peaks in spring, so the new line fills a trough instead of competing for the same weeks. The cash timing is the hard part. To sell in November you commit in summer, when your crews are booked and your yard is full. Your first year is a storage problem before it's a sales problem.

1. Line up the electrician before the first order

An electrical contractor who has actually wired a sauna heater, not one willing to try.

Here's how you check it. Send them a heater specification sheet and ask what supply and protective device they'd fit if the property has single-phase only. A clear answer in one call means you have a partner. A quote with no questions means you don't.

2. Run one delivery end to end before you commit to a range

One unit, your own crew, your own site, your own paperwork.

Here's how you check it. Time every stage: the lift, the route, base preparation, the electrician's hours, the handover. That's your real cost of sale per unit, and no catalogue will give it to you. Still shortlisting factories? Our note on how to tell a reliable sauna manufacturer covers what to ask.

3. Decide now who answers the phone in February

Winter is when timber, doors and seals report back on your installation.

Here's how you check it. Take the acceptance sheet from your first unit, set a reminder for the following February, and call that customer before they call you. One planned visit beats three unplanned ones.

Copy these eight questions into your next management meeting:

1. Who wires it, and have they wired a sauna heater before?

2. What happens when the customer's supply won't carry our specified heater?

3. Where does a unit sit, dry and off the ground, if installation slips?

4. Who lifts it, and when do we refuse a site on access?

5. Whose name goes on the product, ours or the factory's?

6. Who holds the technical file and the declarations?

7. Who takes the February call, out of whose budget?

8. What floor area does the showroom give it, and what comes out?

When is adding a sauna line the wrong move?

Two conditions. If either is true, wait a season.

The first is the electrician. Without a certified contractor who'll take these jobs at your pace, you don't have a sauna line. You have a queue of half-installed cabins and customers who can't use what they paid for.

The second is storage. If you can't keep units dry, covered and off the ground through a postponed installation, the timber will report that to your customer later. Three wet weeks on gravel and it isn't the product that left the factory.

Neither is about size. As of July 2026, a two-van dealer with a good electrician and a dry barn is readier than a large showroom with neither.

You don't need to answer all eight questions this week. Do one. Send your electrician a heater specification sheet for the largest glazed sauna you'd sell, and ask what supply it needs.

It's your name on the cabin after the truck leaves.

Do I need a specialised installation crew to sell saunas?

Not specialised, but retrained. A sauna install is a lifting, levelling and sealing job rather than a plumbing job, and your fitters can learn it across a few units. The task you can't absorb in-house is the electrical connection.

Is a sauna harder to service than a hot tub?

Less frequent, less predictable. There are no pumps, filters or water chemistry to maintain. What you get instead is seasonal timber movement, door and seal adjustment, and heater electrics. Those calls cluster in the cold months rather than spreading out.

Does reselling saunas make me legally responsible for them?

Partly, and fully if you rebrand. Under Regulation (EU) 2023/988, distributors must verify product identification and manufacturer contact details. Place the sauna on the market under your own name and you're deemed to be the manufacturer.

When is the best time of year to launch a sauna line?

Stock in summer, sell from early autumn. In what our own partners order, demand is stronger in the colder half of the year and quieter over the summer months. Your first purchase lands in your busiest pool weeks, so settle yard space first.

How much showroom space does a sauna line need?

Enough for one unit a customer can walk into and sit in. People decide inside the cabin, not from a brochure. Our barrel range runs from 2 to 6 m, so the question is which size you lead with.