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Which steam generators are rated for a 200 cubic foot room?

4 steam products here have a rated room size, as its maker states it, that includes 200 cubic feet. Each maker states its own sizing rule, if any; read it on the product page.

Work out the volume of your room from its inside measurements and write down the wall material and the ceiling height beside it. Read the sizing rule each maker gives on its product page, if it gives one, and take the room and the rule to the maker or your installer before you choose.

Picks by the numbers

Each pick is the product that comes first on one figure its maker publishes, with the next ones on that figure after it. Choosing which figures to rank by is our editorial choice; the order on each is the makers' own numbers. None is a judgement of quality, we have not tested these products, and whether we earn a commission on a product never decides a pick.

  • Lowest published list price from its maker: Amerec AK7.5 (Amerec lists: $3,350 (steam builder on amerec.com, 29 Sep 2026)). Next on this figure: Amerec AK9 ($3,620 (steam builder on amerec.com, 29 Sep 2026)); then Amerec AK11 ($3,895 (steam builder on amerec.com, 29 Sep 2026)).
  • Most output (maker's figure): Amerec AK11 (Amerec lists: Watts: 11000 (240 V); 11250 (208 V)). Next on this figure: Amerec AK9 (Watts: 9000 (240 V); 9000 (208 V)) and Mr. Steam MS400R (kW: 9); then Amerec AK7.5 (Watts: 7500 (240 V); 7510 (208 V)).
  • Longest stated warranty (on at least part of the product): Amerec AK11 (Amerec lists: Limited Lifetime Warranty; all component parts for five years from the date of installation); Amerec AK7.5 (Amerec lists: Limited Lifetime Warranty; all component parts for five years from the date of installation); Amerec AK9 (Amerec lists: Limited Lifetime Warranty; all component parts for five years from the date of installation); 1 more tie.

Where to buy the picks

Each maker's own rated room size

Each figure is the maker's own, quoted from its product page. Each maker states its own sizing rule, if any; read it on the product page.

  • Amerec AK7.5: Amerec lists: Steam Room Cu Ft: Min 100, Max 200.
  • Amerec AK9: Amerec lists: Steam Room Cu Ft: Min 150, Max 300.
  • Amerec AK11: Amerec lists: Steam Room Cu Ft: Min 200, Max 400.
  • Mr. Steam MS400R: Mr. Steam lists: Room Volume (cu. ft.): 162-257.

Delta and ThermaSol state only a maximum room size for each model, so none of their models is listed here; each maker page lists them all.

Every match (4)

Filter the matches by price on the maker's site, warranty, safety listing and where to buy.

Quality signals the maker publishes
Showing 4 of 4
  • Amerec AK7.5

    Steam generator · Amerec

    Amerec · steam generator · 7.5 kW · rated by the maker for 100–200 cu ft

    • $3,350 (steam builder on amerec.com, 29 Sep 2026)
    • Limited Lifetime Warranty; all component parts for five years from the date of installation
    • ETL Listed for USA and Canada
  • Mr. Steam MS400R

    Steam generator · Mr. Steam

    Mr. Steam · steam generator · 9 kW · rated by the maker for 162–257 cu ft

    • $4,300 (List Price, Mr. Steam 2025 price book on docs.mrsteam.com, read 29 Sep 2026)
    • Limited lifetime generator parts warranty
    • US and Canadian UL listed, and CE and NOM certified
  • Amerec AK9

    Steam generator · Amerec

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

    • $3,620 (steam builder on amerec.com, 29 Sep 2026)
    • Limited Lifetime Warranty; all component parts for five years from the date of installation
    • ETL Listed for USA and Canada
  • Amerec AK11

    Steam generator · Amerec

    Amerec · steam generator · 11 kW · rated by the maker for 200–400 cu ft

    • $3,895 (steam builder on amerec.com, 29 Sep 2026)
    • Limited Lifetime Warranty; all component parts for five years from the date of installation
    • ETL Listed for USA and Canada

Prices are the price each maker's own site showed in US dollars on the date shown; the seller's page has the current price. Warranties and safety listings are the makers' own statements, cited on each product page. A price starting 'From' is the cheapest configuration a maker offers, which may leave out the heater or options. Every product here is sold by its maker on the maker's own site. Where a product page carries a paid link (to Amazon or another approved retailer), Saunakivi may earn a commission; no sort order or filter favours those products. We have not tested these products.