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Mr. Steam MX4R

A steam generator from Mr. Steam, rated by the maker for 483–678 cu ft. Every figure below is Mr. Steam's own, linked to where it is published. Mr. Steam's published list price: $7,275 (List Price, Mr. Steam 2025 price book on docs.mrsteam.com, read 29 Sep 2026).

See it at Mr. Steam
Specifications published by Mr. Steam (13)
Heater output
kW: 20Mr. Steam: PRICEBOOK (PDF)
Room size the maker rates it for
Room Volume (cu. ft.): 483-678Mr. Steam: PRICEBOOK (PDF)
Maker's sizing rule
For ceramic or porcelain tile on cement board or mortar bed, no adjustment; For natural stones — natural marble, stone, shale, glass block or concrete, multiply room volume by 1.5; For acrylic, multiply room volume by 0.6; For ceilings higher than 8ft to 9ft multiply adjusted room volume by 1.15. For ceilings higher than 9ft to 10ft max multiply adjusted room volume by 1.3Mr. Steam: PRICEBOOK (PDF)
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 requestMr. Steam: PRICEBOOK (PDF)
Breaker / current
Amps 240/1PH: 84; Wire Size AWG: 3Mr. Steam: PRICEBOOK (PDF)
Dimensions
27.625" x 20.75" x 7.875"Mr. Steam: PRICEBOOK (PDF)
Weight
Shipping Weight: 67 lbs.Mr. Steam: PRICEBOOK (PDF)
Water and drain connections
Steam Pipe (3/4" NPT) Safety Valve (3/4" NPT) Drain (1" NPT) Steam Head (3/4" NPT) Water Supply (3/8" NPT)Mr. Steam: TS0080 MX4R 6R (PDF)
Control included
Required Equipment: iSteamX, TempoTouch, TempoFlex, iTempo, Control.Mr. Steam: TS0080 MX4R 6R (PDF)
Drain and flush
Optional Equipment: ChromaSteam, MS Wallseat, AutoFlush, Drip PanMr. Steam: TS0080 MX4R 6R (PDF)
Safety listing
US and Canadian UL listed, and CE and NOM certifiedMr. Steam: generators
Warranty
Limited lifetime steam generator parts warrantyMr. Steam: TS0080 MX4R 6R (PDF)
Price on the maker's site
$7,275 (List Price, Mr. Steam 2025 price book on docs.mrsteam.com, read 29 Sep 2026)Mr. Steam: PRICEBOOK (PDF)

As published by Mr. Steam, read on 2026-09-29. Makers revise their products; check Mr. Steam'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. Mr. Steam lists: 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. A licensed electrician should confirm your circuit against the installation manual before you buy.

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MX4R: questions answered from Mr. Steam's specification

What size of steam room is the MX4R rated for?

Mr. Steam lists: Room Volume (cu. ft.): 483-678. Each maker states its own sizing rule, if any; read it on the product page.

Source: Mr. Steam: PRICEBOOK (PDF)

What sizing rule does Mr. Steam give for the MX4R?

Mr. Steam says: For ceramic or porcelain tile on cement board or mortar bed, no adjustment; For natural stones — natural marble, stone, shale, glass block or concrete, multiply room volume by 1.5; For acrylic, multiply room volume by 0.6; For ceilings higher than 8ft to 9ft multiply adjusted room volume by 1.15. For ceilings higher than 9ft to 10ft max multiply adjusted room volume by 1.3.

Source: Mr. Steam: PRICEBOOK (PDF)

What is the output of the MX4R?

Mr. Steam lists: kW: 20.

Source: Mr. Steam: PRICEBOOK (PDF)

What voltage does the MX4R run on?

Mr. Steam lists: 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. 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: Mr. Steam: PRICEBOOK (PDF)

What breaker or current does the MX4R need?

Mr. Steam lists: Amps 240/1PH: 84; Wire Size AWG: 3. The installation manual and a licensed electrician have the final word.

Source: Mr. Steam: PRICEBOOK (PDF)

Does the MX4R come with a control?

Mr. Steam lists: Required Equipment: iSteamX, TempoTouch, TempoFlex, iTempo, Control.

Source: Mr. Steam: TS0080 MX4R 6R (PDF)

Does the MX4R drain or flush itself?

Mr. Steam lists: Optional Equipment: ChromaSteam, MS Wallseat, AutoFlush, Drip Pan. Related question: Which steam generators drain or flush themselves?

Source: Mr. Steam: TS0080 MX4R 6R (PDF)

What water and drain connections does the MX4R need?

Mr. Steam lists: Steam Pipe (3/4" NPT) Safety Valve (3/4" NPT) Drain (1" NPT) Steam Head (3/4" NPT) Water Supply (3/8" NPT). A licensed plumber should confirm them against the installation manual.

Source: Mr. Steam: TS0080 MX4R 6R (PDF)

How big is the MX4R?

Mr. Steam lists: 27.625" x 20.75" x 7.875".

Source: Mr. Steam: PRICEBOOK (PDF)

What warranty does Mr. Steam give on the MX4R?

Mr. Steam lists: Limited lifetime steam generator parts warranty.

Source: Mr. Steam: TS0080 MX4R 6R (PDF)

Is the MX4R safety listed?

Mr. Steam states: US and Canadian UL listed, and CE and NOM certified.

Source: Mr. Steam: generators

What is the list price of the MX4R?

Mr. Steam publishes $7,275 (List Price, Mr. Steam 2025 price book on docs.mrsteam.com, read 29 Sep 2026). That is the maker's list price, not a retailer's or Amazon's; dealers set their own prices, and the seller's page shows the current one. Related question: How much does a steam generator cost?

Source: Mr. Steam: PRICEBOOK (PDF)

More from Mr. Steam: all Mr. Steam products on Saunakivi.

Sources

  1. Mr. Steam: TS0080 MX4R 6R (PDF) — Mr. Steam
  2. Mr. Steam: PRICEBOOK (PDF) — Mr. Steam
  3. Mr. Steam: generators — Mr. Steam