Neither. Membrane brand, stack pressure and water purity determine real output.

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Level 3 · Advanced· 4 min read·Updated 2026-06-27

PEM vs SPE technology

PEM (Proton Exchange Membrane) and SPE (Solid Polymer Electrolyte) refer to the same family of perfluorosulfonic-acid membranes. Vendors use the terms interchangeably.

Key takeaways

PEM and SPE describe the same membrane technology.
Both produce H₂ at ≥99.99% purity when engineered correctly.
Membrane quality and stack assembly matter more than the acronym.

Same chemistry, different label

Most consumer machines list PEM. Industrial documentation often uses SPE. The active layer is the same perfluorosulfonic-acid polymer (commonly Nafion or equivalent).

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