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Amerec AK4.5

A steam generator from Amerec, rated by the maker for 60–90 cu ft. Every figure below is Amerec's own, linked to where it is published. Amerec's published list price: $2,945 (steam builder on amerec.com, 29 Sep 2026).

See it at Amerec
Specifications published by Amerec (12)
Heater output
Watts: 4500 (240 V); 4500 (208 V)Amerec: Amerec AK Steam Generator with K2 and K3 (PDF)
Room size the maker rates it for
Steam Room Cu Ft: Min 60, Max 90Amerec: Amerec AK Steam Generator with K2 and K3 (PDF)
Maker's sizing rule
For rooms made of natural stone, multiply the cubic volume by 1.75 (stone requires more power to heat)Amerec: Amerec AK Steam Generator with K2 and K3 (PDF)
Voltage
240 and 208 volt models can be wired in the field for 1 or 3 phase power.Amerec: Amerec AK Steam Generator with K2 and K3 (PDF)
Breaker / current
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 20Amerec: Amerec AK Steam Generator with K2 and K3 (PDF)
Dimensions
16-1/2" x 6-1/4" x 15"Amerec: residential steam bath generator 100
Water and drain connections
Water Inlet – 3/8” NPT; Pressure Relief Valve – 3/4” NPT; Steam Outlet – 1/2” NPT; Drain Outlet – 3/4” NPTAmerec: Amerec AK Steam Generator with K2 and K3 (PDF)
Control included
1 Control Required, additional may be connected. Compatible with the K2, K3, KT3, K4 controls.Amerec: residential steam bath generator 100
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 conditionsAmerec: faq
Safety listing
ETL Listed for USA and CanadaAmerec: residential steam bath generator 100
Warranty
Limited Lifetime Warranty; all component parts for five years from the date of installationAmerec: warranty
Price on the maker's site
$2,945 (steam builder on amerec.com, 29 Sep 2026)Amerec: steam builder

As published by Amerec, read on 2026-09-29. Makers revise their products; check Amerec'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. Amerec lists: 240 and 208 volt models can be wired in the field for 1 or 3 phase power. A licensed electrician should confirm your circuit against the installation manual before you buy.

If you are looking for more

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AK4.5 vs MS90R

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AK4.5 vs PRO Series III 84

Side by side with the ThermaSol PRO Series III 84. Both are steam generators whose stated room-size ratings overlap, read before each maker's own sizing rule.

Other steam generators

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Amerec AK9

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Amerec AK11

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Amerec AK14

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Mr. Steam MS90R

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AK4.5: questions answered from Amerec's specification

What size of steam room is the AK4.5 rated for?

Amerec lists: Steam Room Cu Ft: Min 60, Max 90. Each maker states its own sizing rule, if any; read it on the product page.

Source: Amerec: Amerec AK Steam Generator with K2 and K3 (PDF)

What sizing rule does Amerec give for the AK4.5?

Amerec says: For rooms made of natural stone, multiply the cubic volume by 1.75 (stone requires more power to heat).

Source: Amerec: Amerec AK Steam Generator with K2 and K3 (PDF)

What is the output of the AK4.5?

Amerec lists: Watts: 4500 (240 V); 4500 (208 V).

Source: Amerec: Amerec AK Steam Generator with K2 and K3 (PDF)

What voltage does the AK4.5 run on?

Amerec lists: 240 and 208 volt models can be wired in the field for 1 or 3 phase power. 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: Amerec: Amerec AK Steam Generator with K2 and K3 (PDF)

What breaker or current does the AK4.5 need?

Amerec lists: 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. The installation manual and a licensed electrician have the final word.

Source: Amerec: Amerec AK Steam Generator with K2 and K3 (PDF)

Does the AK4.5 come with a control?

Amerec lists: 1 Control Required, additional may be connected. Compatible with the K2, K3, KT3, K4 controls.

Source: Amerec: residential steam bath generator 100

Does the AK4.5 drain or flush itself?

Amerec lists: 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. Related question: Which steam generators drain or flush themselves?

Source: Amerec: faq

What water and drain connections does the AK4.5 need?

Amerec lists: Water Inlet – 3/8” NPT; Pressure Relief Valve – 3/4” NPT; Steam Outlet – 1/2” NPT; Drain Outlet – 3/4” NPT. A licensed plumber should confirm them against the installation manual.

Source: Amerec: Amerec AK Steam Generator with K2 and K3 (PDF)

How big is the AK4.5?

Amerec lists: 16-1/2" x 6-1/4" x 15".

Source: Amerec: residential steam bath generator 100

What warranty does Amerec give on the AK4.5?

Amerec lists: Limited Lifetime Warranty; all component parts for five years from the date of installation.

Source: Amerec: warranty

Is the AK4.5 safety listed?

Amerec states: ETL Listed for USA and Canada.

Source: Amerec: residential steam bath generator 100

What does the AK4.5 cost on Amerec's site?

Amerec's own site showed $2,945 (steam builder on amerec.com, 29 Sep 2026). That is the maker's price, not a retailer's or Amazon's; prices change, and the seller's page shows the current one. Related question: How much does a steam generator cost?

Source: Amerec: steam builder

More from Amerec: all Amerec products on Saunakivi.

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