Water Stuff & Sun Gmbh

What Water Stuff & Sun Gmbh does

Water Stuff & Sun GmbH (WSS) is a Munich-based hydrogen storage startup founded in 2016 by Thomas Korn, Alvaro Sousa, and Jonas Flädjemark, operating from Unterschleißheim near Munich with an engineering R&D hub in Uppsala, Sweden. The company has built its business around a proprietary low-pressure hydrogen storage architecture called SFEER (Smart-Flexible-Efficient Energy Reservoir), which uses spherical tanks packed into prismatic containers, an Intelligent Micro-Valve System (IMVS), a dual-layer design for durability, and a silicon-based MEMS control chip. The flagship commercial product, the H2 Battery, is positioned as a 2-in-1 device that integrates directly into hydrogen-consuming equipment and simultaneously acts as a fuel carrier in the distribution chain; it scales from 10 kWh to 70 MWh in storage capacity and 1 kW to 1 MW in power output.

The revenue model combines hardware sale of the H2 Battery with hydrogen fuel distribution margins, where the storage capex is recovered through an embedded fuel-cost charge (approximately €5/kWh for the H2 Battery vs. €150/kWh for lithium-ion and €10/kWh for 300-bar compressed hydrogen). The company targets B2B customers in heavy industry and mobility—primarily telecom backup power and long-haul trucking under EU CO2-reduction mandates (43% by 2030, 64% by 2035, 90% by 2040)—with secondary applications in mobile/remote power generation, off-road machinery, and UAVs. Go-to-market is enterprise field sales combined with event-driven visibility (IAA, Cenex Expo, Hello Tomorrow, Monaco Hydrogen Forum, hy-fcell) and strategic validation from public funders including Germany's SPRIN-D and the European Innovation Council.

As of early 2024 the company employed about 15 people across engineering, technology, corporate finance, and operations, and had secured recognition including the World CleanTech StartUPs Award 2023, Most Innovative Technology at Cenex Expo 2024, and the Monaco Prize for Best Emerging Technology 2024. WSS maintains a mutual alignment with sister company KEYOU GmbH (hydrogen-engine conversion for trucks, also led by Thomas Korn), creating a vertically coupled storage-plus-propulsion offering for heavy-duty mobility. Public revenue, paying customer logos, and unit-shipment data are not disclosed in available sources.

Name

Water Stuff & Sun Gmbh

Legal name

water stuff & sun GmbH

Website

https://waterstuffandsun.com

Company type

Private

Founded year

2016

Operating status

Operating

Headcount range

11–50 employees

Short description

Water Stuff & Sun GmbH, founded in 2016 and headquartered near Munich, develops the SFEER-based H2 Battery, a low-pressure spherical-tank hydrogen storage and fuel-carrier solution targeting B2B customers in telecom backup power, heavy-duty trucking, off-road machinery, mobile/remote power, and UAVs across Europe.

Ownership category

akta.pro rank

Product category

Hydrogen Storage Equipment

NAICS

Battery Manufacturing (33591)

SIC

Oil & Gas Field Machinery & Equipment (3533)

akta.pro primary industry

Compressed Hydrogen Storage Systems (Cylinders, Bundles, Tube Trailers) (EUAFAEAA)

akta.pro secondary industries

Hydrogen Storage Terminals, Depots & Bulk Logistics (Siting, Loading/Unloading) (EUAFAEAI), Hydrogen Storage Safety, Monitoring & Integrity (Leak Detection, Sensors, Inspection) (EUAFAEAJ)

Keywords

• Hydrogen storage solutions
• Low-pressure hydrogen tanks
• Clean energy infrastructure
• Hydrogen fuel carriers
• Stationary power backup

Headquarters

HQ city

Unterschleißheim

HQ country

Germany

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Technology or R&D, Supply Chain, Operations, Marketing or Sales

Revenue model

1. H2 Battery Hardware Sales: Sale of H2 Battery units - a 2-in-1 hydrogen storage device that integrates into applications and serves as a fuel carrier. The storage system cost is incorporated into the fuel cost as an energy carrier.
2. Hydrogen Fuel Distribution: Revenue generated through the hydrogen fuel distributed via the H2 Battery infrastructure. The H2 Battery is paid through the fuel cost as energy carrier.

Pricing tiers

Go-to-market motion1 record

Distribution channels2 records

Marketing channels5 records

Core offering

Water Stuff & Sun GmbH develops and sells the H2 Battery, a 2-in-1 hydrogen storage device and fuel carrier based on its proprietary SFEER (Smart-Flexible-Efficient Energy Reservoir) technology. The system uses spherical tanks packed into prismatic containers for low-pressure hydrogen storage, paired with an intelligent micro-valve system for safe, flexible, and efficient distribution. The company also operates a simplified hydrogen fuel supply model in which the H2 Battery is paid through fuel cost as an energy carrier.

Product overview

Water Stuff & Sun GmbH offers hydrogen storage and distribution solutions centered around the H2 Battery, a 2-in-1 hydrogen storage and fuel carrier system. The core technology is SFEER (Smart-Flexible-Efficient Energy Reservoir) using spherical tanks for low-pressure storage with intelligent micro-valve systems and dual-layer design. The company has developed SFEERs, powered by a silicon-based MEMS chip, which enables the H2 Battery to achieve significantly lower costs (approximately -80% vs standard systems), increased energy storage capacity (+100% vs standard cylinders), and intrinsic safety through distributed small units. The H2 Battery can be tailored for energy storage capacities of 10 kWh to 70 MWh and power units from 1 kW to 1 MW.

Differentiator

Problem solved

Functional benefit

Products and services

• H2 Battery A hydrogen storage device that can be easily integrated into products that consume energy in the form of hydrogen, and simultaneously serves as a hydrogen fuel carrier along the fuel distribution infrastructure. It is a 2-in-1 storage and application solution combining safe and simple distribution of hydrogen with integration into various applications in a cost-effective way. Scalable from 10 kWh to 70 MWh energy storage capacities and 1 kW to 1 MW power units.

Quantifiable outcome

• H2 Battery costs €5 per kWh vs €150 per kWh for lithium-ion and €10 for conventional H2 tanks at 300 bar
• +4 more outcomes

Named customers1 record

Segments5 records

Ideal customer profiles5 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Two partnerships are on record, tiered core.

• SPRIN-D (Federal Agency for Breakthrough Innovation)coreStrategic or Co-development Partner · 27 October 2025SPRIN-D commissioned water stuff & sun to assess the innovation of their H2 battery technology for safe, simple and efficient storage and distribution of gases, particularly hydrogen. The validation assignment includes evaluating the potential of an implemented H2 ecosystem, planning a pilot project, and assessing capability to store and distribute different technical gases.
• KEYOU GmbHcoreStrategic or Co-development PartnerRelated company also led by Thomas Korn as CEO. KEYOU converts trucks for hydrogen propulsion while water stuff & sun develops hydrogen storage solutions. Thomas Korn serves as Managing Director of both companies, enabling coordinated hydrogen ecosystem development.

Scale indicators8 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• Faurecia (FORVIA): Through its hydrogen business, FORVIA develops high-pressure hydrogen storage systems for automotive OEMs. Comparable as an established Tier-1 hydrogen storage supplier serving heavy-duty and passenger mobility customers.
• Nel ASA: Norwegian hydrogen company producing electrolyzers, fueling stations, and storage solutions for mobility and industrial customers. Comparable as a publicly-traded hydrogen infrastructure player with overlapping storage and distribution offerings.
• Linde: Global industrial gases major with end-to-end hydrogen production, liquefaction, storage, and distribution infrastructure. Comparable as a broad incumbent in the hydrogen value chain, though at much larger scale and across the full stack.
• Chart Industries: Global supplier of cryogenic and hydrogen liquefaction/storage equipment with a broad industrial gas portfolio. Comparable as an established hydrogen storage hardware incumbent, though focused on cryogenic LH2 rather than low-pressure compressed systems.
• Worthington Industries: Manufactures pressure cylinders, tanks, and storage solutions for industrial gases including hydrogen and CNG. Comparable as an incumbent in compressed gas storage hardware with broader industrial applications.

Direct peers

• McPhy Energy: European hydrogen equipment specialist producing electrolyzers and large-scale solid-state hydrogen storage units. Comparable as a hydrogen storage and distribution peer targeting industrial and mobility applications.
• Hexagon Composites: Leading manufacturer of Type 4 composite pressure vessels for compressed hydrogen storage, serving mobility and industrial gas applications. Directly comparable to Water Stuff & Sun as both sell compressed hydrogen storage tanks to truck, bus, and industrial customers.
• Plastic Omnium: Through its hydrogen subsidiary, designs and produces high-pressure Type IV hydrogen storage tanks for light and heavy-duty vehicles. Direct competitor in automotive/mobility hydrogen storage, with established OEM relationships.

Emerging players

• Hydrogenious LOHC Technologies: Pioneers of Liquid Organic Hydrogen Carrier (LOHC) technology for hydrogen storage and transport. Comparable as an emerging hydrogen storage specialist pursuing an alternative storage architecture to overcome high-pressure compressed gas limitations.
• HPS (Home Power Solutions): German startup developing seasonal hydrogen-based home energy storage using metal hydride technology. Comparable as a European deep-tech hydrogen storage startup targeting stationary and decentralized applications.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/waterstuffsun

Revenue estimate

Valuation estimate

Number of profiles

Profiles12 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Water Stuff & Sun Gmbh