HRS, a French designer and manufacturer of hydrogen infrastructure and the European leader in hydrogen refuelling stations, has announced the completion, as part of the RHeaDHy project and alongside its partners Toyota Motor Europe and ENGIE Lab CRIGEN, of an extensive testing campaign of the Twin Nozzle hydrogen refuelling technology for heavy-duty applications.
This innovative and cost-effective approach enables ultra-fast truck refuelling, with the ambition of matching diesel refuelling performance while leveraging dispensing technology derived from light-duty vehicle applications.
The testing campaign follows the integration of the next-generation Mid Flow Twin hydrogen refuelling technology into an RHeaDHy dispensing station, as announced in January 2026.
A trial campaign with promising results
Over a six-day testing campaign, HRS teams conducted 18 refuelling tests under a wide range of operating conditions, including:
- Ambient temperatures ranging from 15 - 40°C
- Initial tank pressures between 60 - 300 bar.
- Tanks starting at ambient temperature, including particularly demanding high-temperature conditions.
By way of illustration, at an ambient temperature of 30°C, a complete refueling operation was completed in six minutes, including connection, start-up and final purging. The amount of hydrogen dispensed was equivalent to a driving range of up to 600 km for a heavy-duty vehicle.
In total, more than 400 kg of hydrogen were used during the campaign, and 100% of the hydrogen was recovered and recycled through the HRS station following the tests.
A significant milestone for Mid Flow Twin technology The campaign demonstrated the robustness of the ISO 19885-3 Mid Flow Twin refueling protocol, consistently achieving state-of-charge levels above 95%, even at ambient temperatures of up to 40°C. As a remainder, the Mid Flow Twin technology is based on an innovative dual-nozzle architecture designed to significantly reduce refuelling times for both heavy-duty and light-duty vehicles, while optimising hydrogen station installation and operating costs.
The tests also highlighted the flexibility of the entire refueling ecosystem, encompassing both hydrogen dispensing through HRS stations and the truck's onboard storage system. The technology performed successfully in both Twin Nozzle and Single Nozzle configurations.
This campaign therefore represents a key step toward delivering fast, reliable and interoperable hydrogen refuelling solutions for heavy-duty mobility. The project partners will now focus on demonstrating similar refuelling performance directly on a heavy-duty vehicle under real-world operating conditions.