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AK6 vs PRO Series III 140

Amerec AK6 and ThermaSol PRO Series III 140, compared on the figures their makers publish. These steam generators carry room-size ratings that overlap, as their makers state them before each maker's own sizing rule.

The makers' figures side by side

The makers' figures side by side
SpecificationAmerec AK6ThermaSol PRO Series III 140
Heater outputWatts: 6000 (240 V); 6000 (208 V)KW RATING: 8.0
Room size the maker rates it forSteam Room Cu Ft: Min 80, Max 150MAX. ROOM SIZE: 140 CU.FT.
Electrical supply—ELECTRICAL: NEMA 6-50P
Voltage240 and 208 volt models can be wired in the field for 1 or 3 phase power.INPUT VOLTAGE: 208-240VAC; PHASE: 1
Breaker / current240 V: 1 Phase Amps 25, Breaker 40; 3 Phase Amps 14, Breaker 20. 208 V: 1 Phase Amps 29, Breaker 40; 3 Phase Amps 17, Breaker 30AMPS: 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
Dimensions16-1/2" x 6-1/4" x 15"13 15/16" W × 18 11/16" D × 11 15/16" H
Weight—SHIPPING DETAILS Weight | 44 lbs.
Water and drain connectionsWater Inlet – 3/8” NPT; Pressure Relief Valve – 3/4” NPT; Steam Outlet – 1/2” NPT; Drain Outlet – 3/4” NPTWater Inlet 3/8” Compression Steam Outlet 1/2” NPT Drain Pan 3/4" NPT
Control included1 Control Required, additional may be connected. Compatible with the K2, K3, KT3, K4 controls.—
Drain and flushAmerec’s ADK auto drain option is highly recommended to automatically drain and flush the generator after every steam bath; If you do not buy the auto drain, your tank will need to be flushed monthly, or more often, depending on local water conditionsAuto PowerFlush™ pressurized inner tank cleaning system; Stainless Steel Drain Pan Included
Kit includes—SteamVection Kit Included
Safety listingETL Listed for USA and Canada—
WarrantyLimited Lifetime Warranty; all component parts for five years from the date of installation2-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$3,145 (steam builder on amerec.com, 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 AK6 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

Where the published figures differ

  • Heater output: AK6: Watts: 6000 (240 V); 6000 (208 V). PRO Series III 140: KW RATING: 8.0.
  • Room size the maker rates it for: AK6: Steam Room Cu Ft: Min 80, Max 150. PRO Series III 140: MAX. ROOM SIZE: 140 CU.FT.
  • Voltage: AK6: 240 and 208 volt models can be wired in the field for 1 or 3 phase power. PRO Series III 140: INPUT VOLTAGE: 208-240VAC; PHASE: 1.
  • Breaker / current: AK6: 240 V: 1 Phase Amps 25, Breaker 40; 3 Phase Amps 14, Breaker 20. 208 V: 1 Phase Amps 29, Breaker 40; 3 Phase Amps 17, Breaker 30. PRO Series III 140: AMPS: 37; Each generator should be wired to their own separate breaker.
  • Dimensions: AK6: 16-1/2" x 6-1/4" x 15". PRO Series III 140: 13 15/16" W × 18 11/16" D × 11 15/16" H.
  • Water and drain connections: AK6: Water Inlet – 3/8” NPT; Pressure Relief Valve – 3/4” NPT; Steam Outlet – 1/2” NPT; Drain Outlet – 3/4” NPT. PRO Series III 140: Water Inlet 3/8” Compression Steam Outlet 1/2” NPT Drain Pan 3/4" NPT.
  • Drain and flush: AK6: Amerec’s ADK auto drain option is highly recommended to automatically drain and flush the generator after every steam bath; If you do not buy the auto drain, your tank will need to be flushed monthly, or more often, depending on local water conditions. PRO Series III 140: Auto PowerFlush™ pressurized inner tank cleaning system; Stainless Steel Drain Pan Included.
  • Warranty: AK6: Limited Lifetime Warranty; all component parts for five years from the date of installation. 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: AK6: $3,145 (steam builder on amerec.com, 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); weight (only ThermaSol's cited pages give it); control included (only Amerec's cited pages give it); kit includes (only ThermaSol's cited pages give it); safety listing (only Amerec's cited pages give it). Ask the other maker before treating the two as equal on those points.

Read each one in full

Amerec AK6

Amerec · steam generator · 6 kW · rated by the maker for 80–150 cu ft

Sources

  1. Amerec: steam builder — Amerec
  2. Amerec: warranty — Amerec
  3. Amerec: Amerec AK Steam Generator with K2 and K3 (PDF) — Amerec
  4. Amerec: residential steam bath generator 100 — Amerec
  5. Amerec: faq — Amerec
  6. ThermaSol: Thermasol Steam Generator PROIII XXX Manual (PDF) — ThermaSol
  7. ThermaSol: Thermasol Steam Generator PROIII 140 Spec (PDF) — ThermaSol
  8. ThermaSol: warranty — ThermaSol
  9. ThermaSol: Thermasol PriceGuide FINAL (PDF) — ThermaSol
  10. ThermaSol: pro series iii — ThermaSol