The most elegant climate solutions are often the ones that look at a basic physical process and ask a simple question. For Swiss startup Nullpunkt AG, that process is water freezing, and the question is: why drill a 200-meter hole when you can just let a tank of water turn to ice? The company’s core product, the Triton system, is an ice-storage heat pump that harvests the latent heat released during freezing to warm buildings. It’s a quiet, boxy unit that sits outside a home, promising the efficiency of a ground-source system without the disruptive and expensive borehole [nullpunkt.ch, retrieved 2024].
A wedge in the heat pump market
Heat pumps are not new, but their adoption in Europe is often a story of compromise. Air-source units are cheaper and easier to install, but less efficient and noisier. Ground-source systems are highly efficient and quiet, but require significant upfront investment and geological surveys for drilling. Nullpunkt’s bet is that it can carve out a middle lane by using water’s phase change as a thermal battery. The Triton system pulls ambient heat from the air into a water-filled storage tank. When heat is needed inside, the heat pump extracts energy from that water, cooling it until it begins to freeze. The energy released during this freezing process,the latent heat,is then used for heating [nullpunkt.ch, retrieved 2026]. The company claims this delivers seasonal performance coefficients similar to ground-source systems, with an installation footprint and noise profile that appeals to homeowners and planners in dense Swiss neighborhoods [Mercury-Reports, 2024].
Why an engineering firm wrote the check
In February 2024, Nullpunkt secured an investment from EBP Schweiz AG, a Swiss engineering and consulting firm with deep roots in infrastructure and energy planning [Startupticker, February 2024]. This is not a typical venture capital bet. EBP Ventures, the firm’s investment arm, is a strategic investor whose validation carries weight with municipal planners and installers. For a hardware cleantech company selling into a conservative, regulation-heavy market like building heating, having an established engineering partner as a backer is a significant asset. It suggests confidence in the underlying physics and the product’s fit within Switzerland’s energy transition framework. The company is led by CEO and co-founder Thomas Degelo, though the public record on the full founding team remains limited [Swissbau, 2024].
The competitive landscape and the counter-bet
The residential heating market in Western Europe is dominated by established giants like Viessmann and a host of regional players. Nullpunkt’s most direct competitor appears to be Isocal, another European company offering ice-storage systems. The fundamental risk for Nullpunkt is not the technology,the thermodynamics of phase-change energy storage are well understood,but the unit economics and customer adoption curve in a market accustomed to two clear choices.
- The efficiency question. The system’s performance hinges on its ability to match or approach ground-source efficiency over an entire heating season. If the real-world coefficient of performance (COP) sags significantly in prolonged cold spells, the value proposition weakens against a borehole.
- The cost of complexity. An ice-storage system introduces a new component,the storage tank and its management,compared to a standard air-to-water heat pump. This adds material cost and potential points of failure that installers must be trained to handle.
- The incumbent’s edge. Companies like Viessmann have decades of brand trust, vast service networks, and economies of scale. Their counter-bet is that incremental improvements in air-source compressor technology will close the efficiency gap enough to make drilling unnecessary for most homes, rendering niche solutions like ice storage superfluous.
Nullpunkt’s rebuttal is its Swiss-made, high-tech positioning and its strategic partnership with EBP. It is not trying to win on price against a mass-market air-source unit; it is targeting the segment of homeowners and developers who want ground-source efficiency but cannot or will not drill, and who value a compact, quiet, locally engineered solution.
The next twelve months
For a hardware startup at this stage, the path forward is measured in installed units and reference projects. The company’s website mentions showing "real installation situations and specific applications," indicating it is moving beyond prototypes [nullpunkt.ch, retrieved 2026]. The key metrics to watch will be the number of Triton systems deployed in single- and multi-family homes, and the publication of independent performance data from those installations. The backing from EBP should help open doors with property developers and municipal energy planners who specify systems for new builds and retrofits.
On the back of an envelope, the energy potential is straightforward. The latent heat of fusion for water is about 334 kilojoules per kilogram. A modest 10-cubic-meter ice storage tank holds 10,000 kilograms of water. Theoretically, freezing that entire volume releases roughly 930 kilowatt-hours of thermal energy,enough to heat a well-insulated Swiss single-family home for several weeks in winter. The real test is how efficiently Nullpunkt’s system can harvest and deliver that energy year after year, and at what total installed cost.
The company’s success will be measured against one incumbent in particular: the ground-source heat pump from Viessmann or its peers. If Nullpunkt can prove its system delivers 90% of the performance for 80% of the installed cost and zero percent of the drilling hassle, it will have found its market. If not, it remains an elegant answer to a question most homeowners never thought to ask.
Sources
- [nullpunkt.ch, retrieved 2024] Nullpunkt - Heizen Mit Eis | https://www.nullpunkt.ch/
- [Startupticker, February 2024] Junges Cleantech-Startup gewinnt EBP als Investor | https://startupticker.ch/en/news/junges-cleantech-startup-gewinnt-ebp-als-investor
- [Swissbau, 2024] nullpunkt AG | https://swissbau.ch/de/p/nullpunkt-ag.142606
- [Mercury-Reports, 2024] Nullpunkt AG | https://mercury-reports.com/companies/5536b02c-4e4f-4fbb-a91c-97ca6641c931
- [nullpunkt.ch, retrieved 2026] Triton - Nullpunkt | https://www.nullpunkt.ch/produkte/triton/