Heatcube:
Low-cost industrial heat

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Thermal battery specification

Heatcube is a flexible thermal battery that supplies low-cost industrial heat when needed. Designed to replace traditional fossil-fired boilers, Heatcube helps industrial facilities cut costs, reduce emissions, and gain long-term energy security.

Heatcube performance metrics

10-20 MW

Charging capacity

39-104 MWh

Storage capacity

up to 14 MW

Discharge capacity

150-300°C

Steam temperature

>93%

Round trip efficiency

<3 sec

Charge response time

Up to 15,000 tons

Annual CO₂ reductions

Power-to-heat

Application

~280 kWh/m2

Usable storage density

>25 years

Lifetime

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Who's Heatcube for?


Industry

Heatcube is made for industries requiring high-temperature process heat in the temperature range 150 – 300°C, such as food and beverage, pharmaceuticals, chemicals, manufacturing, and heavy industry.

It integrates seamlessly with existing steam infrastructure, enabling decarbonization and low-cost steam without disruption. Good for the world and you!

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How Heatcube works


By electrifying heat

Heatcube charges when electricity prices are low, storing energy as high-temperature heat using safe, non-toxic molten salt. It then discharges steam on demand, with a round-trip efficiency of >93%, and a lifetime performance over 25+ years.

And with flexibility

Choose between Heat-as-a-Service (HaaS) — purchasing green steam without upfront investment, operational risk, or maintenance or Heat-as-a-Product (HaaP) to own and operate the system. Both models offer predictable pricing, long-term savings, and decarbonization.

Switching to a thermal battery - will it pay off?

Heatcube purchasing options

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Hassle-free heat


Heat-as-a-Service (HaaS)

Access clean, renewable heat with minimal upfront investment. Kyoto Group takes care of installation, operation, and maintenance while you simply pay only for the steam you use. This turnkey solution eliminates financial barriers and simplifies the transition to sustainable energy for your industry.

Operated by Kyoto

All HaaS solutions are managed by Kyoto Group, ensuring seamless operation and reliability. From energy storage to heat delivery, we handle every detail so you can focus on running your operatons efficiently. 

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Heat on your terms


Heat-as-a-Product (HaaP)

With Heat as a Product (HaaP), you gain ownership of a Heatcube, allowing you to produce renewable heat on-site. This solution integrates into your operations, delivering high-temperature heat while cutting emissions and energy costs. By adopting this technology, you turn sustainability into a valuable business asset.

A sustainable investment

Owning a Heatcube is an investment in energy independence and long-term cost savings. It empowers your business to reduce reliance on fossil fuels, meet sustainability goals, and position itself as a leader in clean energy adoption.

Heatcube turns sustainability into
a business asset

Low-cost heat

Heatcube supplies
green, low-cost industrial
heat.

Heat without CO2

Reduces CO2 emissions annually by 2,000 to 15,000 tons.

On-demand heat

Absorbs surplus electricity and delivers heat exactly when you need it, 24/7.

Skip the queue - talk directly to the experts

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Tim de Haas

Chief Commercial Officer
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Pedro Montoro Sánchez

Commercial Director Iberia
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Elena Davydova

Business Support Associate
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Lars Martinussen

Commercial Dir. Northern Europe
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Resources

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Product brochure

Heatcube at a Glance


Get the figures

 

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White paper

Heating the way forward - how to effectively decarbonize process heat


Download the white paper

 

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White paper

Thermal Energy Storage research by Dr. Silvia Trevisan from the KTH Royal Institute of Stockholm

Download the whitepaper

 

FAQs

Answers to the most common customer questions about Heatcube.

Based on one cycle per day, the round trip efficiency from electricity to steam is minimum 93%.

Heatcube is equipped with a 7 MW steam generation system. The temperature and pressure do depend on the feed water supply and energy storage volume, but our standard configuration (52 MWh storage) delivers more than 12 hours of 7.5 tons per hour at 16 bar(a), with a feedwater temperature of 100°C (equals 5 MWh for 10 hours).

Heatcube is supplied with a Battery Management System (BMS), which can be connected with the local Energy Management System (EMS) using a standard industry interface. The storage tanks do not require any preventive or periodic maintenance. The auxiliary systems (pumps, valves, etc) require minimal ongoing maintenance and training will be provided.

For an industrial facility with steam demand covered by an electric boiler, the energy cost is directly related to the average and/or peak power prices in the region it is located. With Heatcube, we can offer significant energy savings by load-shifting the electricity demand from high-priced to low-priced hours in the power market.

The increasing share of intermittent renewable power production together with decommissioning of fossil-based power generation creates more price volatility in the power markets. In the hours with high wind and solar power output and low demand, the power prices become very low, while in hours with less wind and solar, the power prices are consequently very high. With Heatcube, we are utilizing the increasing price volatility in the power markets to store energy in hours with high renewable production and low prices. When charging Heatcube with cheap electricity from excess renewable power production, we can deliver renewable heat whenever needed at a very low cost. At the same time, we are replacing fossil fuels with renewable electricity as the energy source for heat production, and so removing close to all carbon emissions associated with the industrial heat demand.

Heatcube is designed with a steam temperature range from 150°C to 300°C and can generate up to 14MW of discharge capacity. The saturated steam temperature is between 150°C and 215°C, with a steam pressure between 3 and 25 bar(a). To achieve 300°C (superheated steam) a superheater can be added to Heatcube's steam generator.

You've reached the bottom, but maybe not the end of your curiosity...


If you’re wondering how Heatcube actually works, take a closer look at the
technology that powers it. Unpack the tech

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