PEM Electrolyzer - H Series

  • H Series Hydrogen Gas Generators

H Series Nel PEM Electrolyzers

Nel H2, H4, and H6 hydrogen generators utilize advanced Proton Exchange Membrane (PEM) cell stack and PSA technology to consistently produce 99.9995% reliable ultra-high purity hydrogen for all applications on-site. PEM hydrogen generators provide direct user benefits by improving supply reliability and site safety.

H Series hydrogen generators are modular, field-upgradeable, and designed to eliminate the need for delivered hydrogen anywhere in the world. A single H6 unit, for example, can supply the equivalent of one and a half jumbo tube trailers per month. Multiple H model systems can be combined for additional capacity with no additional integration costs.

Adobe IconH Series Spec Sheet
With efficiency in mind, H Series hydrogen generators are engineered to sense demand and adjust production accordingly, eliminating the need for tube trailers. Additionally, the Nel H Series hydrogen generator systems provide quiet and steady operation with significant space-saving capabilities.


  • Autofill water level control
  • Water purity monitor
  • Automatic leak detection
  • Purge airflow system ensures safe operation
  • Report alarms
  • Load-following technology senses demand and adjusts production accordingly
  • Low maintenance design, with maintenance reminders
  • Touchscreen interface
  • Modular and upgradeable
  • Compatible with multiple units

Specifications for H Series Hydrogen Electrolyzers

H Series hydrogen generators utilize a platinum catalyst and PEM technology to split deionized water into its constituent parts. The PEM only allows water and positive ions to cross between compartments. The membrane also serves as the electrolyte in the cell, eliminating the need for hazardous liquid electrolytes such as concentrated potassium hydroxide. PEM water electrolysis simply splits pure deionized water (H2O) into its constituent parts, hydrogen (H2) and oxygen (O2), on either side of the membrane.

Download our pdf for a full ist of the H Series specifications

Flow Rate (splm)
Nominal Production Rate
35 Nm3/h
76 SCF/h
4.31 kg/24 h
71 Nm3/h
152 SCF/h
8.63 kg/24 h
107 Nm3/h
228 SCF/h
12.94 kg/24 h
Purity (concentration of impurties)
99.9995% [H2O < 5 ppm, -65°C (-85°F) Dew Point, N2 < 2 ppm, O2 < 1 ppm,
all others undetectable] 
Delivery Pressure - Nominal 
15 barg (218 psig); Optional 30 barg (435 psig) 


H Series hydrogen generators can manufacture hydrogen gas on-site, without the need for bulky tanks. Depending on your specific needs, hydrogen generators can be used for a wide range of industrial applications, some of which include:
  • Gas chromatography carrier gas and fuel gas
  • Hydrogen supply for fuel cell
  • ICP-MS collision gas
  • Hydrogen supply for hydrogenation reactor
  • Hydrogen supply for emissions test equipment
  • Gas analyzer support gas
  • ELCD (conductivity detector) reaction gas
  • AED (atomic emission detector) of reaction gas

Additional Services

SilPac does more than just manufacture gas systems. We also offer a complete list of of services to support your gas distribution equipment. We provide on-site system startup, function testing, training and field service and support. 

Related Products 

We carry a variety of hydrogen generators to meet any need, including the: 

Contact Us Today for Nel PEM Electrolyzers

Our success is measured by customer satisfaction, and our dedication to quality objectives drives continual improvement in all aspects of our business. Contact us or request a quote today and let us find the best solution to satisfy your needs and expectations.