Our roadmap to decarbonized heating through efficiency innovation, natural refrigerants, and hydrogen-ready technology.
All five production facilities operate under ISO 14001 environmental management. Our Stuttgart headquarters runs on 100% renewable electricity, with rooftop solar generating 1.2 MWp annually. We target carbon-neutral manufacturing by 2035.
Our entire heat pump portfolio now uses R-290 propane refrigerant with a GWP of just 3, compared to R-410A at 2,088. We fully comply with the EU F-Gas Regulation phase-down timeline and advocate for accelerated adoption of natural refrigerants.
All new condensing boiler models are certified for 20% hydrogen blending. Our R&D program targets 100% hydrogen combustion capability by 2028, enabling our customers to transition fuel sources without replacing equipment.
Clear milestones toward a zero-emission heating future.
Full transition of commercial heat pump range to R-290 natural refrigerant. Discontinuation of all R-410A models for new installations.
Integrated boiler-heat pump hybrid systems with AI-optimized switching logic that automatically selects the most carbon-efficient heat source based on real-time grid carbon intensity.
Full product range certified for 100% hydrogen combustion, enabling complete fossil-fuel independence for customers on hydrogen grid infrastructure.
All production facilities achieve net-zero carbon emissions through renewable energy, process optimization, and verified carbon offset programs for residual emissions.
The EU F-Gas Regulation (revised 2024) mandates a phase-down of high-GWP HFC refrigerants. Two viable pathways exist, and facility owners should understand the trade-offs of each.
GWP of 3 or lower. No patent dependencies and no future phase-down risk. R-290 achieves COP values comparable to or exceeding R-410A in commercial heat pump applications. However, R-290 is classified as A3 (flammable) under ISO 817, limiting charge sizes per unit to approximately 5 kg under EN 378-1 for indoor installations. This cap restricts single-unit capacity for very large commercial systems. R-717 ammonia is highly efficient but toxic (B2L classification), restricting its use to machine rooms with dedicated ventilation and leak detection systems.
GWP of 1–7, non-flammable or mildly flammable (A2L). Drop-in compatible with many existing R-410A and R-134a systems, enabling lower-cost retrofits. Existing technician training and tooling transfer directly. However, HFOs are patent-protected (currently held by Chemours and Honeywell), creating supply concentration risk and higher refrigerant costs. Some HFO breakdown products (trifluoroacetic acid / TFA) are under environmental scrutiny by the European Chemicals Agency (ECHA) as persistent pollutants.
ViessTech has committed to natural refrigerants for our heat pump portfolio based on long-term sustainability and cost predictability. We recognize that HFO-based systems remain a valid transition technology for retrofit applications where flammability restrictions apply. Our engineering team provides refrigerant pathway assessments tailored to each facility's regulatory environment and risk tolerance.
Transparency about the current boundaries of our sustainability commitments.
Our 40% CO2 reduction since 2015 covers Scope 1 (direct manufacturing) and Scope 2 (purchased energy) emissions only. Scope 3 emissions—primarily from steel and copper supply chains, logistics, and product end-of-life disposal—are not yet included in our carbon accounting. We estimate Scope 3 represents approximately 65% of our total carbon footprint and plan to begin formal reporting under the Corporate Sustainability Reporting Directive (CSRD) in 2027.
Our hydrogen-ready boilers are certified for 20% H2 blend, but the timeline for widespread hydrogen grid availability remains outside our control. As of 2025, fewer than 5% of European gas distribution networks have announced firm hydrogen injection schedules. Customers in regions without published hydrogen grid plans should not purchase hydrogen-ready equipment solely for decarbonization purposes—heat pump or electrification solutions may deliver faster emission reductions.
Our 2035 carbon-neutral target includes verified carbon offset programs for residual emissions that cannot be eliminated through process optimization alone. We estimate 8–12% of manufacturing emissions will require offsets rather than direct reduction. We commit to using only Gold Standard or Verified Carbon Standard (VCS) certified offset projects and will publish annual offset volumes in our sustainability report.
Let our engineers help you plan a decarbonization pathway for your heating infrastructure. From efficiency audits to heat pump integration, we provide the technical roadmap.
Download Our Sustainability Report