Solutions
Compact thermal storage for urban projects
A practical alternative when energy wells, noise limits or rooftop space rule out conventional storage.
Urban projects often face constraints conventional thermal storage can't handle: no space for energy wells, occupied or off-limits rooftops, strict noise requirements from neighbours, and a tight technical room footprint. The Thermal Box is compact, silent and ready to retrofit — 4–8× less volume than a water tank for the same stored kWh, indoor or outdoor placement, minimal noise. The Ranheimsveien 9 office building in Trondheim runs an 800 kWh / 200 kW installation that fits a 12 000 m² office without rooftop or energy-well infrastructure.
Typical impact
Compact thermal storage for urban projects- 4–8×
- less volume than water
- Silent
- operation
- Indoor/outdoor
- placement
The challenge
Urban sites face limited space for energy wells, strict noise rules, and rooftops that are already occupied by PV or HVAC — making conventional storage hard or impossible.
The Cartesian outcome
The Thermal Box delivers peak thermal capacity in 4–8× less volume than a water tank, with silent operation and indoor or outdoor placement.
Best fit when…
- Urban offices and retail
- Mixed-use developments
- Hospitals and schools tight on plant space
How it works
From signal to saving — every cycle.
- 01
Audit the site
We assess available plant space, access routes and noise constraints.
- 02
Choose the topology
Indoor (technical room), outdoor (parking lot) or hybrid — Euro-pallet footprint per module.
- 03
Pre-engineer in our shop
Modules and hydraulics are built and pressure-tested in Trondheim before delivery.
- 04
Install retrofit-ready
Standard pallet jack and flanged connections — typically one weekend per cabinet.
FAQ
Common questions about compact thermal storage for urban projects
Can it really fit through a standard door?
Yes — each module has a Euro-pallet footprint (1.2 × 0.8 m) and is transported with a pallet jack. Insulation panels are fitted on site.
How loud is it?
Silent in standby. The only sound is the circulation pump on the optional skid — typically below 40 dB(A) at one metre.
Outdoor in a Nordic winter?
Yes — insulated panels handle Nordic temperatures. Indoor placement is preferred when space allows, but not required.
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