What Maintenance Does a Steam Generator Need?

Published September 27, 2026

Summary

Steam-generator maintenance is mostly about controlling mineral scale, following the manufacturer's drain or flushing procedure, and keeping the unit accessible for service. The exact routine depends on the generator design and the home's water quality. Some systems drain the tank automatically after each use, which slows sediment build-up but does not replace service.

Mineral scale is the main issue

Every time a generator heats water, dissolved minerals can be left behind. Homes with harder water generally have more scale to manage.

Amerec's manual warns that calcium build-up can cause poor performance and damage the heating elements. Its maintenance check covers leaks, loose or damaged wires, corrosion, and calcium build-up on the level probe in the tank.

Automatic flushing helps, but it does not mean 'maintenance-free'

MrSteam's AutoFlush drains old water and sediment after every session without anyone pressing a button. Amerec's Autodrain rinses and empties the tank about 25 minutes after a steam bath ends, and Delta recommends its auto drain for areas with hard water.

Automatic draining does not replace service. Amerec says there are no user-serviceable parts in its generators and that repairs should be done by a qualified service person.

Water quality can change the routine

Amerec asks for the water supply to be tested before the generator is first used, lists a recommended feedwater hardness of 10 to 30 ppm (0.5 to 1.75 grains per gallon), and says a local water treatment company can recommend treatment if it is needed.

Keep the access panel usable

A generator installed in a closet or vanity should still be reachable after the remodel is finished.

Do not tile over the only access point or build permanent cabinetry in front of the unit. ThermaSol's warranty excludes installations that do not permit proper access for service.

Use the model manual instead of a universal schedule

There is no single maintenance interval that fits every steam generator and every water supply.

Keep the model number and manual with the house documents. Amerec's manual, for example, requires a drain valve on every generator so the tank can be drained for cleaning and maintenance, and it supplies a manual ball valve for that.

Sources

Specifications, prices and installation requirements are as the makers published them on these pages on the date above and can change. Check the current manual and the retailer before you buy.