Products
A complete thermal-flex kit. Engineered to retrofit.
The Thermal Box is the storage; the pump skid and controls turn it into a working asset; financing makes it a no-brainer for property owners.
Products
A complete kit. Engineered to retrofit.
Thermal Box Basic
The core Thermal Box module, delivered ready to integrate. Pumps, valves, controls and balance of plant are sourced by the contractor or system integrator.
- Storage capacity
- 60 – 125 kWh per module
- Heating / cooling output
- 20 – 35 kW per module
- Temperature range
- −20 °C to +120 °C
- Round-trip efficiency
- 98 %
Thermal Box Standard
Thermal Box delivered in a pre-assembled cabinet with circulation pump, energy meter, required valves and a Building Management System controller — ready for integration into your local Building Management System.
- Includes
- Thermal Box + hydraulic skid + controller
- Integration
- Ready for local Building Management System
- Storage capacity
- 60 – 125 kWh per module
- Lifetime
- 25+ years
Thermal Box Advanced
Everything in the Standard offering, plus a cloud-based management system with options for local integration into the Building Management System. Spot-price and CO₂-aware optimisation, remote M&V and over-the-air updates.
- Includes
- Standard + cloud management
- Optimisation
- Spot-price & CO₂ aware
- Monitoring
- Cloud dashboard · open API
- Integration
- Local Building Management System + remote
Common questions
Got questions about thermal storage?
From PCM chemistry and lifetime to indoor vs outdoor installs and typical payback — the answers are in the full FAQ.
Read all questionsWhat is thermal energy storage?
The term is used when storing energy as heat or cold, which can be released at a later stage. The heat or cold is usually stored when energy is cheap and then released when the heating or cooling demand is at a peak or the cost of energy is high.
What is PCM?
PCM means Phase Change Material and refers to any material that changes state, for example from solid to liquid, when reaching a certain temperature. This phase change enables large amounts of energy to be absorbed or released. Water is one PCM, storing cold at zero degrees Celsius by changing phase to ice. Cartesian uses a wide variety of other materials, such as bio-based waxes, to store heat or cold at different temperatures.
Is the Thermal Box and the PCM flammable?
For applications with HVAC systems, Cartesian's Thermal Box is not considered flammable. While some PCM might be flammable when they reach temperatures above 100 °C or more, the Thermal Box is designed to eliminate any risks of reaching flammability conditions in operations.
Are PCMs safe?
Cartesian offers only safe PCMs and primarily uses bio-based PCMs in the Thermal Box. The PCM will stay in the Thermal Box for its whole lifetime and is not consumed during operation. The Thermal Box is also designed to avoid any risk of PCM leakage.
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