Key takeaways
- Treat sustained dissolved ppb as the headline spec, not peak ml/min.
- Confirm PEM/SPE chassis — not a repurposed inhaler, not an alkaline Brown's-gas unit.
- Require CE, FCC, RoHS and an ISO 9001 / ISO 13485 manufacturing context.
- Check the support model — same-vendor support beats outsourced service centres.
Output
Ask for sustained dissolved concentration across a 20-minute session in a standard 150–200 L tub, not peak ppb measured at the head. Reputable suppliers publish both numbers; some publish only the headline peak.
Cross-check hydrogenated water flow rate (ml/min). Higher flow saturates faster and compensates for surface losses across a long soak.
Construction quality
Sealed enclosure with a clearly stated IP rating for placement near a humid bath. Stainless or appropriate polymer wetted parts on the water side. A power supply built for continuous duty, not intermittent burst use. A dissolution head that is removable for cleaning.
Certifications
CE (electrical safety), FCC (electromagnetic compatibility for the country of sale), RoHS (restriction of hazardous substances). ISO 9001 for quality-management traceability; ISO 13485 for stricter manufacturing process control. These do not register the device as a therapy — they describe hardware and process.
Ease of maintenance
Reservoir, dissolution head and source-side filter should be easy to access without tools. Spare parts (head, filter, hose) should be available from the supplier years after purchase. Membrane life is determined by source-water discipline, not by service intervals.
Support and warranty
Look for direct support from the supplier rather than an outsourced regional hub. A 24-month manufacturer warranty is standard. Confirm the warranty path — return-to-base, in-region service, or full unit replacement — before purchase.
Frequently asked questions
Related products
Related learning
Purity, tablets & bathing
- Hydrogen Bathing vs Hydrogen Tablets — Saturation versus dilution, compared in full.
- Hydrogen Water Purity — model-specific gas composition from SPE/PEM electrolysis.
- Hydrogen Tablets: What You Should Know — What dissolving reactive material can leave behind.
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