See it at Mr. Steam: MS150R
Mr. Steam's own page for the MS150R. Not a paid link.
MS150R vs PRO Series III 140
Mr. Steam MS150R and ThermaSol PRO Series III 140, compared on the figures their makers publish. Both are steam generators, and the room sizes their makers state, before each maker's own sizing rule, overlap.
The makers' figures side by side
| Specification | Mr. Steam MS150R | ThermaSol PRO Series III 140 |
|---|---|---|
| Heater output | kW: 6 | KW RATING: 8.0 |
| Room size the maker rates it for | Room Volume (cu. ft.): 72-107 | MAX. ROOM SIZE: 140 CU.FT. |
| Electrical supply | — | ELECTRICAL: NEMA 6-50P |
| Voltage | 2401 after model number denotes a 240V/1PH generator; B1 after model number denotes a 208V/1PH generator; Other voltage and phase combinations available upon request | INPUT VOLTAGE: 208-240VAC; PHASE: 1 |
| Breaker / current | Amps 240/1PH: 25; Wire Size AWG: 8 | AMPS: 37; Each generator should be wired to their own separate breaker |
| Controls | — | COMPATIBLE OPTIONS: Thermatouch Series; Signatouch Series; Microtouch Series; Signature Control Series; Easy Start Series |
| Dimensions | 14.5" x 14.75" x 6.75" | 13 15/16" W × 18 11/16" D × 11 15/16" H |
| Weight | Shipping Weight: 27 lbs. | SHIPPING DETAILS Weight | 44 lbs. |
| Water and drain connections | Steam Outlet (3/4" NPT) Water Supply (3/8" NPT) Safety Valve (3/4" NPT) Steam Head (3/4" NPT) Drain (1/2" NPT) | Water Inlet 3/8” Compression Steam Outlet 1/2” NPT Drain Pan 3/4" NPT |
| Control included | Required Equipment: SteamX, iTempoTouch, TempoFlex, iTempo, Controls | — |
| Drain and flush | Optional Equipment: ChromaX, AudioX, Recessed Light, MS Wallseat, AutoFlush, Drip Pan | Auto PowerFlush™ pressurized inner tank cleaning system; Stainless Steel Drain Pan Included |
| Kit includes | — | SteamVection Kit Included |
| Safety listing | US and Canadian UL listed, and CE and NOM certified | — |
| Warranty | Limited lifetime generator parts 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 factory |
| Price on the maker's site | $3,675 (List Price, Mr. Steam 2025 price book on docs.mrsteam.com, read 29 Sep 2026) | $4,790 (List Price, ThermaSol price guide effective April 2025, on thermasol.com, read 29 Sep 2026) |
Each figure is the maker's own, as cited row by row on the MS150R and PRO Series III 140 pages and listed in the sources below. A dash means the figure is not on the maker pages we cite. Each maker states its own sizing rule, if any; read it on the product page.
Where to buy
Buy from ThermaSol: PRO Series III 140
ThermaSol's own page for the PRO Series III 140. Not a paid link.
Where the published figures differ
- Heater output: MS150R: kW: 6. PRO Series III 140: KW RATING: 8.0.
- Room size the maker rates it for: MS150R: Room Volume (cu. ft.): 72-107. PRO Series III 140: MAX. ROOM SIZE: 140 CU.FT.
- Voltage: MS150R: 2401 after model number denotes a 240V/1PH generator; B1 after model number denotes a 208V/1PH generator; Other voltage and phase combinations available upon request. PRO Series III 140: INPUT VOLTAGE: 208-240VAC; PHASE: 1.
- Breaker / current: MS150R: Amps 240/1PH: 25; Wire Size AWG: 8. PRO Series III 140: AMPS: 37; Each generator should be wired to their own separate breaker.
- Dimensions: MS150R: 14.5" x 14.75" x 6.75". PRO Series III 140: 13 15/16" W × 18 11/16" D × 11 15/16" H.
- Weight: MS150R: Shipping Weight: 27 lbs. PRO Series III 140: SHIPPING DETAILS Weight | 44 lbs.
- Water and drain connections: MS150R: Steam Outlet (3/4" NPT) Water Supply (3/8" NPT) Safety Valve (3/4" NPT) Steam Head (3/4" NPT) Drain (1/2" NPT). PRO Series III 140: Water Inlet 3/8” Compression Steam Outlet 1/2” NPT Drain Pan 3/4" NPT.
- Drain and flush: MS150R: Optional Equipment: ChromaX, AudioX, Recessed Light, MS Wallseat, AutoFlush, Drip Pan. PRO Series III 140: Auto PowerFlush™ pressurized inner tank cleaning system; Stainless Steel Drain Pan Included.
- Warranty: MS150R: Limited lifetime generator parts warranty. PRO Series III 140: 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.
- Price on the maker's site: MS150R: $3,675 (List Price, Mr. Steam 2025 price book on docs.mrsteam.com, read 29 Sep 2026). PRO Series III 140: $4,790 (List Price, ThermaSol price guide effective April 2025, on thermasol.com, read 29 Sep 2026).
Figures we cite for only one of the two: electrical supply (only ThermaSol's cited pages give it); controls (only ThermaSol's cited pages give it); control included (only Mr. Steam's cited pages give it); kit includes (only ThermaSol's cited pages give it); safety listing (only Mr. Steam's cited pages give it). Ask the other maker before treating the two as equal on those points.
Read each one in full
Mr. Steam MS150R
Mr. Steam · steam generator · 6 kW · rated by the maker for 72–107 cu ft
ThermaSol PRO Series III 140
ThermaSol · steam generator · 8 kW · rated by the maker for up to 140 cu ft
Sources
- Mr. Steam: TS0041 90R 400R (PDF) — Mr. Steam
- Mr. Steam: PRICEBOOK (PDF) — Mr. Steam
- Mr. Steam: generators — Mr. Steam
- 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