See it at Amerec: AK6
Amerec's own page for the AK6. Not a paid link.
Which steam generators are rated for a 100 cubic foot room?
3 steam products here have a rated room size, as its maker states it, that includes 100 cubic feet. Each maker states its own sizing rule, if any; read it on the product page.
Measure the shower's inside length, width and height before you read the list, and note what the walls are made of and how tall the ceiling is. Then open each product page and read the sizing rule its maker gives, if any, because a rule belongs to its own maker and never carries over to another maker's generator.
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 AK6 (Amerec lists: $3,145 (steam builder on amerec.com, 29 Sep 2026)). Next on this figure: Amerec AK7.5 ($3,350 (steam builder on amerec.com, 29 Sep 2026)); then Mr. Steam MS150R ($3,675 (List Price, Mr. Steam 2025 price book on docs.mrsteam.com, read 29 Sep 2026)).
- Most output (maker's figure): Amerec AK7.5 (Amerec lists: Watts: 7500 (240 V); 7510 (208 V)). Next on this figure: Amerec AK6 (Watts: 6000 (240 V); 6000 (208 V)) and Mr. Steam MS150R (kW: 6).
- Longest stated warranty (on at least part of the product): Amerec AK6 (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); Mr. Steam MS150R (Mr. Steam lists: Limited lifetime generator parts warranty).
Where to buy the picks
See it at Amerec: AK7.5
Amerec's own page for the AK7.5. Not a paid link.
See it at Mr. Steam: MS150R
Mr. Steam's own page for the MS150R. Not a paid link.
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 AK6: Amerec lists: Steam Room Cu Ft: Min 80, Max 150.
- Amerec AK7.5: Amerec lists: Steam Room Cu Ft: Min 100, Max 200.
- Mr. Steam MS150R: Mr. Steam lists: Room Volume (cu. ft.): 72-107.
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 (3)
Filter the matches by price on the maker's site, warranty, safety listing and where to buy.
Showing 3 of 3
- Mr. Steam MS150R
Steam generator · Mr. Steam
Mr. Steam · steam generator · 6 kW · rated by the maker for 72–107 cu ft
- $3,675 (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 AK6
Steam generator · Amerec
Amerec · steam generator · 6 kW · rated by the maker for 80–150 cu ft
- $3,145 (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 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
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.