See it at Amerec: AK11
Amerec's own page for the AK11. Not a paid link.
Which steam generator has the longest warranty?
25 steam products here state a warranty; 23 of them state a lifetime term on at least part of the product. The terms differ in what they cover (the generator, its parts, its electronics, labour), so each product page quotes the maker's full wording.
Read the full wording on each product page before you rank on the headline, because makers split their terms between the generator, its parts, its electronics and the labour. Then weigh what each covers against how the generator will be installed, and narrow by price.
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.
- 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 AK14 (Amerec lists: Limited Lifetime Warranty; all component parts for five years from the date of installation); Amerec AK4.5 (Amerec lists: Limited Lifetime Warranty; all component parts for five years from the date of installation); 20 more tie. Next on this figure: Mr. Steam Steam@Home SAH3000R (limited one-year warranty) and Mr. Steam Steam@Home SAH6000R (limited one-year warranty).
- Lowest published list price from its maker: Delta SteamScape 5kW Steam Generator (Delta lists: $2,822 (List Price on deltafaucet.com, 29 Sep 2026)). Among the 23 of 25 that list this figure. Next on this figure: Amerec AK4.5 ($2,945 (steam builder on amerec.com, 29 Sep 2026)); then Mr. Steam MS90R ($3,075 (List Price, Mr. Steam 2025 price book on docs.mrsteam.com, read 29 Sep 2026)).
- Most output (maker's figure): Mr. Steam MX4R (Mr. Steam lists: kW: 20). Next on this figure: Delta SteamScape 15kW Steam Generator (Kilowatts: 15kw) and Mr. Steam MSSUPER3R (kW: 15), 1 more at this figure; then Amerec AK14 (Watts: 14000 (240 V); 13580 (208 V)).
Where to buy the picks
See it at Amerec: AK14
Amerec's own page for the AK14. Not a paid link.
See it at Amerec: AK4.5
Amerec's own page for the AK4.5. Not a paid link.
Buy from Delta: SteamScape 5kW Steam Generator
Delta's own page for the SteamScape 5kW Steam Generator. Not a paid link.
See it at Mr. Steam: MX4R
Mr. Steam's own page for the MX4R. Not a paid link.
Every match (25)
Filter the matches by price on the maker's site, warranty, safety listing and where to buy.
Showing 25 of 25
- Mr. Steam MS90R
Steam generator · Mr. Steam
Mr. Steam · steam generator · 5 kW · rated by the maker for up to 71 cu ft
- $3,075 (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
- ThermaSol PRO Series III 84
Steam generator · ThermaSol
ThermaSol · steam generator · 6 kW · rated by the maker for up to 84 cu ft
- $4,435 (List Price, ThermaSol price guide effective April 2025, on thermasol.com, read 29 Sep 2026)
- 2-year limited “In-Home” warranty; Thermasol will replace any defective parts for the life of the product for the original purchaser and will cover labor performed at the factory
- Amerec AK4.5
Steam generator · Amerec
Amerec · steam generator · 4.5 kW · rated by the maker for 60–90 cu ft
- $2,945 (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
- Delta SteamScape 5kW Steam Generator
Steam generator · Delta
Delta · steam generator · 5 kW · rated by the maker for up to 100 cu ft
- $2,822 (List Price on deltafaucet.com, 29 Sep 2026)
- Steam Generators – Lifetime limited warranty; Electronic Parts for Steam Bath Generators, Controls, Spa Options and Accessories – two (2) years from the date the product is received by the original consumer purchaser
- UL/cUL Listed
- 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
- ThermaSol PRO Series III 140
Steam generator · ThermaSol
ThermaSol · steam generator · 8 kW · rated by the maker for up to 140 cu ft
- $4,790 (List Price, ThermaSol price guide effective April 2025, on thermasol.com, read 29 Sep 2026)
- 2-year limited “In-Home” warranty; Thermasol will replace any defective parts for the life of the product for the original purchaser and will cover labor performed at the factory
- 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
- Mr. Steam MS225R
Steam generator · Mr. Steam
Mr. Steam · steam generator · 7.5 kW · rated by the maker for 108–161 cu ft
- $4,075 (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 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
- ThermaSol PRO Series III 240
Steam generator · ThermaSol
ThermaSol · steam generator · 10 kW · rated by the maker for up to 240 cu ft
- $5,475 (List Price, ThermaSol price guide effective April 2025, on thermasol.com, read 29 Sep 2026)
- 2-year limited “In-Home” warranty; Thermasol will replace any defective parts for the life of the product for the original purchaser and will cover labor performed at the factory
- Delta SteamScape 7.5kW Steam Generator
Steam generator · Delta
Delta · steam generator · 7.5 kW · rated by the maker for up to 250 cu ft
- $3,642 (List Price on deltafaucet.com, 29 Sep 2026)
- Steam Generators – Lifetime limited warranty; Electronic Parts for Steam Bath Generators, Controls, Spa Options and Accessories – two (2) years from the date the product is received by the original consumer purchaser
- UL/cUL Listed
- 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
- Mr. Steam MSSUPER1R
Steam generator · Mr. Steam
Mr. Steam · steam generator · 10 kW · rated by the maker for 258–339 cu ft
- $4,975 (List Price, Mr. Steam 2025 price book on docs.mrsteam.com, read 29 Sep 2026)
- Limited lifetime steam generator parts warranty
- US and Canadian UL listed, and CE and NOM certified
- ThermaSol PRO Series III 395
Steam generator · ThermaSol
ThermaSol · steam generator · 11 kW · rated by the maker for up to 395 cu ft
- $5,890 (List Price, ThermaSol price guide effective April 2025, on thermasol.com, read 29 Sep 2026)
- 2-year limited “In-Home” warranty; Thermasol will replace any defective parts for the life of the product for the original purchaser and will cover labor performed at the factory
- 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
- Delta SteamScape 10kW Steam Generator
Steam generator · Delta
Delta · steam generator · 10 kW · rated by the maker for up to 450 cu ft
- $4,570 (List Price on deltafaucet.com, 29 Sep 2026)
- Steam Generators – Lifetime limited warranty; Electronic Parts for Steam Bath Generators, Controls, Spa Options and Accessories – two (2) years from the date the product is received by the original consumer purchaser
- UL/cUL Listed
- Mr. Steam MSSUPER3R
Steam generator · Mr. Steam
Mr. Steam · steam generator · 15 kW · rated by the maker for 412–482 cu ft
- $5,925 (List Price, Mr. Steam 2025 price book on docs.mrsteam.com, read 29 Sep 2026)
- Limited lifetime steam generator parts warranty
- US and Canadian UL listed, and CE and NOM certified
- Amerec AK14
Steam generator · Amerec
Amerec · steam generator · 14 kW · rated by the maker for 350–550 cu ft
- $4,210 (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
- Delta SteamScape 12kW Steam Generator
Steam generator · Delta
Delta · steam generator · 12 kW · rated by the maker for up to 550 cu ft
- $4,965 (List Price on deltafaucet.com, 29 Sep 2026)
- Steam Generators – Lifetime limited warranty; Electronic Parts for Steam Bath Generators, Controls, Spa Options and Accessories – two (2) years from the date the product is received by the original consumer purchaser
- UL/cUL Listed
- ThermaSol PRO Series III 575
Steam generator · ThermaSol
ThermaSol · steam generator · 15 kW · rated by the maker for up to 575 cu ft
- $6,480 (List Price, ThermaSol price guide effective April 2025, on thermasol.com, read 29 Sep 2026)
- 2-year limited “In-Home” warranty; Thermasol will replace any defective parts for the life of the product for the original purchaser and will cover labor performed at the factory
- Delta SteamScape 15kW Steam Generator
Steam generator · Delta
Delta · steam generator · 15 kW · rated by the maker for up to 675 cu ft
- $5,642 (List Price on deltafaucet.com, 29 Sep 2026)
- Steam Generators – Lifetime limited warranty; Electronic Parts for Steam Bath Generators, Controls, Spa Options and Accessories – two (2) years from the date the product is received by the original consumer purchaser
- UL/cUL Listed
- Mr. Steam MX4R
Steam generator · Mr. Steam
Mr. Steam · steam generator · 20 kW · rated by the maker for 483–678 cu ft
- $7,275 (List Price, Mr. Steam 2025 price book on docs.mrsteam.com, read 29 Sep 2026)
- Limited lifetime steam generator parts warranty
- US and Canadian UL listed, and CE and NOM certified
- Mr. Steam Steam@Home SAH3000R
Steam shower package · Mr. Steam
Mr. Steam · steam shower package · 3 kW
- No price on the maker's site
- limited one-year warranty
- cULus Listed
- Mr. Steam Steam@Home SAH6000R
Steam shower package · Mr. Steam
Mr. Steam · steam shower package · 6 kW · rated by the maker for 111–150 cu ft
- No price on the maker's site
- limited one-year warranty
- cULus Listed
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.