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AK4.5 vs PRO Series III 84

Amerec AK4.5 and ThermaSol PRO Series III 84, compared on the figures their makers publish. Both are steam generators whose stated room-size ratings overlap, read before each maker's own sizing rule.

The makers' figures side by side

The makers' figures side by side
SpecificationAmerec AK4.5ThermaSol PRO Series III 84
Heater outputWatts: 4500 (240 V); 4500 (208 V)KW RATING: 6.0
Room size the maker rates it forSteam Room Cu Ft: Min 60, Max 90MAX. ROOM SIZE: 84 CU.FT.
Electrical supply—ELECTRICAL: NEMA 6-30P
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 19, Breaker 30; 3 Phase Amps 11, Breaker 15. 208 V: 1 Phase Amps 22, Breaker 30; 3 Phase Amps 12, Breaker 20AMPS: 28; 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$2,945 (steam builder on amerec.com, 29 Sep 2026)$4,435 (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 AK4.5 and PRO Series III 84 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: AK4.5: Watts: 4500 (240 V); 4500 (208 V). PRO Series III 84: KW RATING: 6.0.
  • Room size the maker rates it for: AK4.5: Steam Room Cu Ft: Min 60, Max 90. PRO Series III 84: MAX. ROOM SIZE: 84 CU.FT.
  • Voltage: AK4.5: 240 and 208 volt models can be wired in the field for 1 or 3 phase power. PRO Series III 84: INPUT VOLTAGE: 208-240VAC; PHASE: 1.
  • Breaker / current: AK4.5: 240 V: 1 Phase Amps 19, Breaker 30; 3 Phase Amps 11, Breaker 15. 208 V: 1 Phase Amps 22, Breaker 30; 3 Phase Amps 12, Breaker 20. PRO Series III 84: AMPS: 28; Each generator should be wired to their own separate breaker.
  • Dimensions: AK4.5: 16-1/2" x 6-1/4" x 15". PRO Series III 84: 13 15/16" W × 18 11/16" D × 11 15/16" H.
  • Water and drain connections: AK4.5: Water Inlet – 3/8” NPT; Pressure Relief Valve – 3/4” NPT; Steam Outlet – 1/2” NPT; Drain Outlet – 3/4” NPT. PRO Series III 84: Water Inlet 3/8” Compression Steam Outlet 1/2” NPT Drain Pan 3/4” NPT.
  • Drain and flush: AK4.5: 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 84: Auto PowerFlush™ pressurized inner tank cleaning system; Stainless Steel Drain Pan Included.
  • Warranty: AK4.5: Limited Lifetime Warranty; all component parts for five years from the date of installation. PRO Series III 84: 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: AK4.5: $2,945 (steam builder on amerec.com, 29 Sep 2026). PRO Series III 84: $4,435 (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 AK4.5

Amerec · steam generator · 4.5 kW · rated by the maker for 60–90 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 84 Spec (PDF) — ThermaSol
  7. ThermaSol: Thermasol Steam Generator PROIII XXX Manual (PDF) — ThermaSol
  8. ThermaSol: warranty — ThermaSol
  9. ThermaSol: Thermasol PriceGuide FINAL (PDF) — ThermaSol
  10. ThermaSol: pro series iii — ThermaSol