AK9 vs MSSUPER1R

Amerec AK9 and Mr. Steam MSSUPER1R, 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
Specification	Amerec AK9	Mr. Steam MSSUPER1R
Heater output	Watts: 9000 (240 V); 9000 (208 V)	kW: 10
Room size the maker rates it for	Steam Room Cu Ft: Min 150, Max 300	Room Volume (cu. ft.): 258-339
Voltage	240 and 208 volt models can be wired in the field for 1 or 3 phase power.	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
Breaker / current	240 V: 1 Phase Amps 38, Breaker 50; 3 Phase Amps 22, Breaker 30. 208 V: 1 Phase Amps 43, Breaker 60; 3 Phase Amps 25, Breaker 40	Amps 240/1PH: 42; Wire Size AWG: 8
Dimensions	16-1/2" x 6-1/4" x 15"	17" x 18.5" x 7.9"
Weight	—	Shipping Weight: 39 lbs.
Water and drain connections	Water Inlet – 3/8” NPT; Pressure Relief Valve – 3/4” NPT; Steam Outlet – 1/2” NPT; Drain Outlet – 3/4” NPT	Steam Outlet (3/4" NPT) Water Supply (3/8" NPT) Safety Valve (3/4" NPT) Steam Head (3/4" NPT) Drain (1/2" NPT)
Control included	1 Control Required, additional may be connected. Compatible with the K2, K3, KT3, K4 controls.	Required Equipment: iSteamX, iTempo, TempoTouch, TempoFlex Control
Drain and flush	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	Optional Equipment: ChromaSteam, MS Wallseat, AutoFlush, Drip Pan
Safety listing	ETL Listed for USA and Canada	US and Canadian UL listed, and CE and NOM certified
Warranty	Limited Lifetime Warranty; all component parts for five years from the date of installation	Limited lifetime steam generator parts warranty
Price on the maker's site	$3,620 (steam builder on amerec.com, 29 Sep 2026)	$4,975 (List Price, Mr. Steam 2025 price book on docs.mrsteam.com, read 29 Sep 2026)

Each figure is the maker's own, as cited row by row on the AK9 and MSSUPER1R 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

See it at Amerec: AK9

Amerec's own page for the AK9. Not a paid link.

See it at Mr. Steam: MSSUPER1R

Mr. Steam's own page for the MSSUPER1R. Not a paid link.

Where the published figures differ

Heater output: AK9: Watts: 9000 (240 V); 9000 (208 V). MSSUPER1R: kW: 10.
Room size the maker rates it for: AK9: Steam Room Cu Ft: Min 150, Max 300. MSSUPER1R: Room Volume (cu. ft.): 258-339.
Voltage: AK9: 240 and 208 volt models can be wired in the field for 1 or 3 phase power. MSSUPER1R: 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.
Breaker / current: AK9: 240 V: 1 Phase Amps 38, Breaker 50; 3 Phase Amps 22, Breaker 30. 208 V: 1 Phase Amps 43, Breaker 60; 3 Phase Amps 25, Breaker 40. MSSUPER1R: Amps 240/1PH: 42; Wire Size AWG: 8.
Dimensions: AK9: 16-1/2" x 6-1/4" x 15". MSSUPER1R: 17" x 18.5" x 7.9".
Water and drain connections: AK9: Water Inlet – 3/8” NPT; Pressure Relief Valve – 3/4” NPT; Steam Outlet – 1/2” NPT; Drain Outlet – 3/4” NPT. MSSUPER1R: Steam Outlet (3/4" NPT) Water Supply (3/8" NPT) Safety Valve (3/4" NPT) Steam Head (3/4" NPT) Drain (1/2" NPT).
Control included: AK9: 1 Control Required, additional may be connected. Compatible with the K2, K3, KT3, K4 controls. MSSUPER1R: Required Equipment: iSteamX, iTempo, TempoTouch, TempoFlex Control.
Drain and flush: AK9: 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. MSSUPER1R: Optional Equipment: ChromaSteam, MS Wallseat, AutoFlush, Drip Pan.
Safety listing: AK9: ETL Listed for USA and Canada. MSSUPER1R: US and Canadian UL listed, and CE and NOM certified.
Warranty: AK9: Limited Lifetime Warranty; all component parts for five years from the date of installation. MSSUPER1R: Limited lifetime steam generator parts warranty.
Price on the maker's site: AK9: $3,620 (steam builder on amerec.com, 29 Sep 2026). MSSUPER1R: $4,975 (List Price, Mr. Steam 2025 price book on docs.mrsteam.com, read 29 Sep 2026).

Figures we cite for only one of the two: weight (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

Amerec AK9

Amerec · steam generator · 9 kW · rated by the maker for 150–300 cu ft

Mr. Steam MSSUPER1R

Mr. Steam · steam generator · 10 kW · rated by the maker for 258–339 cu ft

Sources

Amerec: steam builder — Amerec
Amerec: warranty — Amerec
Amerec: Amerec AK Steam Generator with K2 and K3 (PDF) — Amerec
Amerec: residential steam bath generator 100 — Amerec
Amerec: faq — Amerec
Mr. Steam: TS0041 S1R S3R (PDF) — Mr. Steam
Mr. Steam: PRICEBOOK (PDF) — Mr. Steam
Mr. Steam: generators — Mr. Steam