Storage boiler technology

Every Heat Cell contains blocks of Caldera’s proprietary composite of recycled aluminium and iron pellets. This ‘supermaterial’ has a high energy density and is conductive, durable, and affordable. Heat Cell cores are heated using standard electric elements. Thanks to their high conductivity, heat spreads evenly throughout the core.

Each core is encased in a double-walled vessel, essentially a vacuum flask. The vacuum prevents conduction and convection of heat, while an additional material prevents radiative losses. This proprietary system provides lasting performance over years without maintenance, though the vacuum can be ‘topped up’ during servicing if necessary.

Stored heat is converted to steam by injecting ultra-pure water into pipes embedded in the storage material, which can then be piped directly into the site’s steam network. This steam extracts stored energy from the heat cell, and varying the volume of water controls the power output.

A factory-assembled package containing switches and thyristor controls that allows variable charging from 0-100%. The power supply is designed to provide 2 MW at 690 V or 650 kW at 400 V. This package includes an energy management system, dynamically responding to charging signals and heat demand.

Takes Reverse Osmosis (RO) water or condensate and runs further processes that include a second stage of RO, CO₂ removal, Electrodeionization (EDI) and de-oxygenation. The water treatment package does not need to be co-located with the Heat Cell and is often better situated near existing water treatment equipment.