H₂ydroGEM Generation 5 prototype, the hydrogen heat generator by Giacomini

Thanks to a patented catalytic process, Giacomini H2ydroGEM uses hydrogen to generate heating and hot domestic water without producing in the process any harmful substance like CO2 or NOx. The latest evolution of H2ydroGEM has been designed to decarbonize existing buildings without the need of major renovations, as it is capable of supplying existing high temperature heating systems with high efficiency and limited cost. Furthermore, the catalytic process is flameless and, therefore, intrinsically safe.

H₂ydroGEM Generation 5 prototype, the hydrogen heat generator by Giacomini

Main features

  • Flame-free catalytic reaction, 300 °C
  • High or low-temperature heating
  • Instant hot domestic water production
  • Patented exhaust steam recirculation system
  • Exhaust fumes (steam) free of greenhouse gases (CO2 and NOx)

Components

  1. Flame-free catalytic reaction

  2. Patented exhaust fumes (steam) recirculation system

H2ydroGEM - Generation 5 components

Operation

Top legend

  • S = Exhaust fumes (steam) free of greenhouse gases
  • A = Air

Bottom legend (from the left side)

  • High or Low temperature heating - supply
  • Hot domestic water
  • Hydrogen
  • Cold domestic water
  • High or Low temperature heating - return
H2ydroGEM - Generation 5 operation

How it works

How the hydrogen heat generator works

Why choose Hydrogen?

  • Zero emissions (no CO2 - no NOx)
  • Optimizes electrical demand and integrates with renewable energy sources
  • Suitable for minimally invasive renovations

Our milestones: decades-long R&D experience

H2ydroGEM - Generation 5, our milestones

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H2ydroGEM Generation 5
H2ydroGEM Generation 5
EH2025 - FEB2025
Prototype hydrogen heat generator for heating and hot domestic water production