Rated by ThermaSol for a bigger room: ThermaSol PRO Series III 240
ThermaSol lists for the PRO Series III 240: MAX. ROOM SIZE: 240 CU.FT. For the PRO Series III 140: MAX. ROOM SIZE: 140 CU.FT.
ThermaSol PRO Series III 140
A steam generator from ThermaSol, rated by the maker for up to 140 cu ft. Every figure below is ThermaSol's own, linked to where it is published. ThermaSol's published list price: $4,790 (List Price, ThermaSol price guide effective April 2025, on thermasol.com, read 29 Sep 2026).
Buy from ThermaSolSpecifications published by ThermaSol (14)
- Heater output
- KW RATING: 8.0ThermaSol: Thermasol Steam Generator PROIII XXX Manual (PDF)
- Room size the maker rates it for
- MAX. ROOM SIZE: 140 CU.FT.ThermaSol: Thermasol Steam Generator PROIII XXX Manual (PDF)
- Maker's sizing rule
- Just multiply your shower’s Length x Width x Height to get the total cubic feet. Wall materials do not affect generator size. For ceilings 9 ft high, size up one generator; For ceilings 10 ft high, size up twoThermaSol: pro series iii
- Electrical supply
- ELECTRICAL: NEMA 6-50PThermaSol: Thermasol Steam Generator PROIII XXX Manual (PDF)
- Voltage
- INPUT VOLTAGE: 208-240VAC; PHASE: 1ThermaSol: Thermasol Steam Generator PROIII XXX Manual (PDF)
- Breaker / current
- AMPS: 37; Each generator should be wired to their own separate breakerThermaSol: Thermasol Steam Generator PROIII XXX Manual (PDF)
- Controls
- COMPATIBLE OPTIONS: Thermatouch Series; Signatouch Series; Microtouch Series; Signature Control Series; Easy Start SeriesThermaSol: Thermasol Steam Generator PROIII 140 Spec (PDF)
- Dimensions
- 13 15/16" W × 18 11/16" D × 11 15/16" HThermaSol: pro series iii
- Weight
- SHIPPING DETAILS Weight | 44 lbs.ThermaSol: Thermasol Steam Generator PROIII 140 Spec (PDF)
- Water and drain connections
- Water Inlet 3/8” Compression Steam Outlet 1/2” NPT Drain Pan 3/4" NPTThermaSol: Thermasol Steam Generator PROIII 140 Spec (PDF)
- Drain and flush
- Auto PowerFlush™ pressurized inner tank cleaning system; Stainless Steel Drain Pan IncludedThermaSol: Thermasol Steam Generator PROIII 140 Spec (PDF)
- Kit includes
- SteamVection Kit IncludedThermaSol: pro series iii
- Warranty
- 2-year limited “In-Home” warranty; Thermasol will replace any defective parts for the life of the product for the original purchaser and will cover labor performed at the factoryThermaSol: warranty
- Price on the maker's site
- $4,790 (List Price, ThermaSol price guide effective April 2025, on thermasol.com, read 29 Sep 2026)ThermaSol: Thermasol PriceGuide FINAL (PDF)
As published by ThermaSol, read on 2026-09-29. Makers revise their products; check ThermaSol's current specification before you buy. Each maker states its own sizing rule, if any; read it on the product page.
Before you buy
- Electrical supply. ThermaSol lists ELECTRICAL: NEMA 6-50P. A licensed electrician should confirm your supply against the installation manual before you buy.
If you are looking for more
A lower published list price from its maker: Delta SteamScape 10kW Steam Generator
Delta publishes a list price of $4,570; ThermaSol publishes $4,790 for the PRO Series III 140. Each product page names where its figure is published.
Compare it with
PRO Series III 140 vs AK6
Side by side with the Amerec AK6. These steam generators carry room-size ratings that overlap, as their makers state them before each maker's own sizing rule.
PRO Series III 140 vs SteamScape 5kW Steam Generator
Side by side with the Delta SteamScape 5kW Steam Generator. Both are steam generators, and the room sizes their makers state, before each maker's own sizing rule, overlap.
PRO Series III 140 vs MS150R
Side by side with the Mr. Steam MS150R. Both are steam generators, and the room sizes their makers state, before each maker's own sizing rule, overlap.
Other steam generators
Amerec AK4.5
Amerec · steam generator · 4.5 kW · rated by the maker for 60–90 cu ft
Amerec AK6
Amerec · steam generator · 6 kW · rated by the maker for 80–150 cu ft
Amerec AK7.5
Amerec · steam generator · 7.5 kW · rated by the maker for 100–200 cu ft
Amerec AK9
Amerec · steam generator · 9 kW · rated by the maker for 150–300 cu ft
Amerec AK11
Amerec · steam generator · 11 kW · rated by the maker for 200–400 cu ft
Amerec AK14
Amerec · steam generator · 14 kW · rated by the maker for 350–550 cu ft
PRO Series III 140: questions answered from ThermaSol's specification
What size of steam room is the PRO Series III 140 rated for?
ThermaSol lists: MAX. ROOM SIZE: 140 CU.FT. Each maker states its own sizing rule, if any; read it on the product page.
Source: ThermaSol: Thermasol Steam Generator PROIII XXX Manual (PDF)
What sizing rule does ThermaSol give for the PRO Series III 140?
ThermaSol says: Just multiply your shower’s Length x Width x Height to get the total cubic feet. Wall materials do not affect generator size. For ceilings 9 ft high, size up one generator; For ceilings 10 ft high, size up two.
Source: ThermaSol: pro series iii
Which controls work with the PRO Series III 140?
ThermaSol lists: COMPATIBLE OPTIONS: Thermatouch Series; Signatouch Series; Microtouch Series; Signature Control Series; Easy Start Series.
Source: ThermaSol: Thermasol Steam Generator PROIII 140 Spec (PDF)
What is the output of the PRO Series III 140?
ThermaSol lists: KW RATING: 8.0.
Source: ThermaSol: Thermasol Steam Generator PROIII XXX Manual (PDF)
What voltage does the PRO Series III 140 run on?
ThermaSol lists: INPUT VOLTAGE: 208-240VAC; PHASE: 1. Have a licensed electrician confirm your circuit against the installation manual before you buy. Related question: Which steam generators run on a 240 V circuit?
Source: ThermaSol: Thermasol Steam Generator PROIII XXX Manual (PDF)
What breaker or current does the PRO Series III 140 need?
ThermaSol lists: AMPS: 37; Each generator should be wired to their own separate breaker. The installation manual and a licensed electrician have the final word.
Source: ThermaSol: Thermasol Steam Generator PROIII XXX Manual (PDF)
What comes with the PRO Series III 140?
ThermaSol lists: SteamVection Kit Included.
Source: ThermaSol: pro series iii
Does the PRO Series III 140 drain or flush itself?
ThermaSol lists: Auto PowerFlush™ pressurized inner tank cleaning system; Stainless Steel Drain Pan Included. Related question: Which steam generators drain or flush themselves?
Source: ThermaSol: Thermasol Steam Generator PROIII 140 Spec (PDF)
What water and drain connections does the PRO Series III 140 need?
ThermaSol lists: Water Inlet 3/8” Compression Steam Outlet 1/2” NPT Drain Pan 3/4" NPT. A licensed plumber should confirm them against the installation manual.
Source: ThermaSol: Thermasol Steam Generator PROIII 140 Spec (PDF)
How big is the PRO Series III 140?
ThermaSol lists: 13 15/16" W × 18 11/16" D × 11 15/16" H.
Source: ThermaSol: pro series iii
What warranty does ThermaSol give on the PRO Series III 140?
ThermaSol lists: 2-year limited “In-Home” warranty; Thermasol will replace any defective parts for the life of the product for the original purchaser and will cover labor performed at the factory.
Source: ThermaSol: warranty
What is the list price of the PRO Series III 140?
ThermaSol publishes $4,790 (List Price, ThermaSol price guide effective April 2025, on thermasol.com, read 29 Sep 2026). That is the maker's list price, not a retailer's or Amazon's; dealers set their own prices, and the seller's page shows the current one. Related question: How much does a steam generator cost?
More from ThermaSol: all ThermaSol products on Saunakivi.
Sources
- ThermaSol: Thermasol Steam Generator PROIII XXX Manual (PDF) — ThermaSol
- ThermaSol: Thermasol Steam Generator PROIII 140 Spec (PDF) — ThermaSol
- ThermaSol: warranty — ThermaSol
- ThermaSol: Thermasol PriceGuide FINAL (PDF) — ThermaSol
- ThermaSol: pro series iii — ThermaSol