ThermaSol Steam Generator
ThermaSol PRO Series III Steam Generator
ThermaSol's PRO Series III steam generator runs from 6 kW to 24 kW for steam showers of 84 to 1,200 cubic feet. Budget for a control and steamhead on top, since the generator ships without them.
- Steam
- Electric
- 240V Hardwired
Where it’s made
According to the maker:
- Assembled in Round Rock, Texas
- Materials Stainless steel tank of unstated origin
$4,435–$8,270USD
117% above the median for heaters & stoves.
We may earn a commission when you buy through this link, and you pay the same price. Price as recorded in our catalog on Oct 10, 2026.
Good to know: The lifetime parts warranty covers home installs only, and the manual names no UL or ETL listing.
- heater
- 6kW
- hardwired circuit
- 240V
Before you order
This page gathers what ThermaSol publishes about the PRO Series III, checked Oct 10, 2026, and adds up what it costs to install.
Who should buy the PRO Series III?
The PRO Series III suits a steam shower of 84 to 1,200 cubic feet, put in by a contractor who'll plumb and wire it. ThermaSol assembles it in Round Rock, Texas, and Harvia of Finland has owned the company since 2024. Its PowerFlush cycle cleans the tank, and it can sit up to 50 feet from the shower.
Amerec's AK Series, built in Cokato, Minnesota, costs less for most rooms and carries an ETL listing.
What does it take to install?
Each size needs its own breaker at 208V to 240V, from 28 amps for the smallest to 110 for the largest. The two smallest plug into NEMA 6-30 or 6-50 receptacles, and the rest are hardwired. ThermaSol rates it for indoor use only.
What does the PRO Series III cost all in?
| Cost | Amount | Where the figure comes from |
|---|---|---|
| List price | $4,435–$8,270 | The regular price at ThermaSol, recorded Oct 10, 2026. |
| Control | Extra | Sold separately |
| Steamhead | Extra | Sold separately |
| Dedicated circuit | Electrician's quote | 28 to 110 amps by size |
| Plumbing | Contractor's quote | Water line and drain to the generator |
ThermaSol's warranty covers parts and labor in the home for two years, then parts for life, on residential installs. We found no UL or ETL mark in the manual.
This guide draws on ThermaSol's PRO Series III page and manual and Harvia's 2024 release, read Oct 10, 2026.
By the numbers
Price in context
Where it sits among the 8 heaters & stoves we list
The ThermaSol PRO Series III Steam Generator tops out at $8,270, which makes it the dearest of the 8 heaters & stoves we list. The cheapest is the North Woods Fabrication Sauna Wood Stove at $540.
What it costs to run
Electricity for a 6 kW heater
- Per session
- 31¢
- Per month
- $6.77
- Per year
- $81
Sessions of 30 minutes at 17.3¢ a kWh in USD, with the heater cycling as it holds temperature. 17.3¢ is the EIA's 2025 US residential average. Work it out for your own numbers.
The room it heats
Sized for about 230 to 280 cubic feet
That’s a room roughly 6.5 feet on each side for this 6 kW heater. Glass or a cold climate calls for a bigger one.
Check the maker’s own room rating before you buy.
What to know before you buy
Steam, electric, 240V, stainless steel. These decide whether it suits your space and your electrical panel.
- SteamA steam room runs wet heat at lower temperatures, the way a classic hammam does.
- ElectricAn electric heater holds a steady temperature on its thermostat and needs no chimney. Many models add app or timer control.
- 240V HardwiredA hardwired model needs a dedicated 240V circuit installed by an electrician. Build roughly $600–$2,500 into your total budget for it.
Specifications
From ThermaSol’s own listing, checked when the page was written.
| Brand | ThermaSol |
|---|---|
| Model | ThermaSol PRO Series III Steam Generator |
| Type | Steam Generator |
| Heater | 6 kW |
| Heat | Steam, Electric |
| Power | 240V Hardwired |
| Materials and power | Steam, electric, 240V, stainless steel |
| Where it's built | Assembled in Round Rock, Texas |
| List price | $4,435–$8,270 USD |
| Where to buy | ThermaSol |
| Price recorded | Oct 10, 2026 |
How it compares
We'd weigh the PRO Series III against these 3 models from our catalog.
- Amerec AK Series Steam Generator
$2,945–$4,210
Amerec's AK Series is ETL listed and built in Cokato, Minnesota
- Scandia Ultra Medium Electric Sauna Heater
$1,300–$1,750
Scandia's Ultra Medium heats a dry sauna room instead
- Almost Heaven Auburn 2-3 Person Indoor Sauna
$4,577
Almost Heaven's Auburn is a cedar sauna room for indoors
| Product | |  |  |  |
|---|---|---|---|---|
| Price | $4,435–$8,270 | $2,945–$4,210 | $1,300–$1,750 | $4,577 |
| Heater | 6 kW | 4.5 kW | 6 kW | 6 kW |
| Heat | Steam, Electric | Steam, Electric | Electric | Electric |
| Power | 240V Hardwired | 240V Hardwired | 240V Hardwired | 240V Hardwired |
| Links | Buy | See it | See it | See it |
ThermaSol Steam Generator
Buy the ThermaSol PRO Series III Steam Generator
$4,435–$8,270
Buy at ThermaSolWe may earn a commission when you buy through this link, and you pay the same price.
