Solstice® HFO Refrigerants drive the efficiency of district heating networks.

Ultra-low GWP Honeywell Solstice® ze (R-1234ze)and Solstice® zd (R-1233zd) HFO refrigerants are designed for safe application in large-scale heat pumps that power district heating networks. Step toward a net zero future with Honeywell and accelerate your rollout with confidence.

Choose Solstice® HFO Refrigerants for your district heating

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Suitable for urban areas

With their blend of safety, sustainability, efficiency and cost-effectiveness, Solstice® ze and Solstice® zd refrigerants are ideal for heat networks in urban areas. 

Lower Your Footprint with Solstice Refrigerant for District Heating

Reduces environmental impact

Boasting zero ozone depleting potential, a short atmospheric life and EU F-Gas compliance, ultra-low GWP Solstice® ze and Solstice® zd refrigerants provide a sustainable heating and cooling solution.

Honeywell Solstice Refrigerant - Safe and Environmentally Friendly Option for Cooling Systems

increases safety

Solstice® ze and Solstice® zd refrigerants can be stored and handled safely, reflected in their respective A2L (mildly flammable) and A1 (non-flammable) classifications, non-toxicity and compliance with PED standards.

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Reduces total cost of ownership 

The safety, sustainability and efficiency of Solstice® ze and Solstice® zd refrigerants provides a compelling total cost of ownership relative to other solutions.


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Eases conversion 

With their near drop-in design, Solstice® ze and Solstice® zd refrigerants can be deployed quickly and efficiently in district heating applications.

Key applications

Medium-pressure chillers to cool large buildings
High-temperature heat pumps
District cooling and heating
Infrastructure projects
Medium-temperature self contained refrigeration cabinets
Process chillers in refrigeration applications
Organic Rankine Cycle (ORC)

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Solstice® HFO Refrigerant helps decarbonise London Homes

As part of its ambition to become carbon neutral by 2030, Southwark Council in south east London developed a plan to decarbonise the gas-powered heat networks used by thousands of council homes across the borough.
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Solstice® HFO Refrigerant decarbonises heat in Denmark

Ringsted District Heating Utility wanted to achieve 95% carbon-free heat without significantly increasing the cost to its customers.
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Benefits of Solstice® ze

Choose the Right Refrigerant for Your Heat Generation Plant
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Get in touch with us

If you are a Sustainability Leader, Consultant Engineer, Heat Pump Specialist, Technology Leader or Project/Operations Manager and planning a new heat pump solution for any of the applications listed above, please do get in touch and learn more about how you can reduce cost, decrease risk and run your heat pump eco-efficiently?