*Promethean Innovations*

# Every watt of compute ends as heat. We make sure it lands somewhere useful.

Data centers spend up to 40% of their power getting rid of heat.[1] The rest of the world spends almost half its energy making it.[2] Promethean closes the loop: compute that heats, heat that pays.

- [Meet Heatoshi](https://promethean.is/heatoshi)
- [See commercial installations](https://promethean.is/commercial)
- [Run your own numbers](https://calc.heatoshi.xyz/)

Sources:
1. [US Department of Energy, COOLERCHIPS announcement (2022)](https://www.energy.gov/articles/doe-announces-42-million-develop-high-performance-cooling-systems-data-centers)
2. [IEA, Renewables 2025, renewable heat](https://www.iea.org/reports/renewables-2025/renewable-heat)

*The opportunity*

## We throw away two of our most valuable resources.

### Compute is growing fast

Data centers consume around 400 TWh a year and are expected to double by 2030.[3] Cooling that hardware takes up to 40% of the power draw and cost.[1]

### Heat demand is enormous

Heat is almost half of all the energy the world uses,[2] and space heating alone is a third of what a US commercial building burns.[4] Almost none of it is reused heat.

### Big deployments are slow

A conventional data center is all-or-nothing. Approval takes months or years, and it may not come. Smaller, distributed deployments carry less risk and reach market faster.

Sources:
3. [IEA, Energy and AI (2025)](https://www.iea.org/reports/energy-and-ai)
4. [US EIA, energy use in commercial buildings (2018)](https://www.eia.gov/energyexplained/use-of-energy/commercial-buildings.php)

*The concept*

## Compute is a heat source.

Server-grade hardware sits in homes and businesses and serves as the heat source. Our patent-pending technology captures that heat and delivers it as comfort or process heat. The computation earns rewards, and the rewards offset the electricity bill.

1. **Compute does paid work.** A work provider assigns the load. The chips release heat as they run.
2. **We capture it.** Our patent-pending hydronic system routes the heat through exchangers, not out to the air.
3. **Heat goes where you need it.** Comfort heat, process heat, or a dry cooler when nothing needs warming.
4. **The work pays.** Rewards for the computation offset the electricity it uses.

*Two ways in*

### [Heatoshi](https://promethean.is/heatoshi)

Our retail product. The world's first self-contained residential hydronic heater based on computationally generated heat. For homes, offices, pools, and barns.

### [Commercial installations](https://promethean.is/commercial)

Engineered heat-recovery compute systems for hotels, warehouses, food production, multi-unit buildings, and other sites where heat is a line item.

*Who we are*

## Built by people who have commissioned the boilers, shipped the software and run the kitchen.

We believe the energy transition is mostly a plumbing problem: the heat already exists, it is just in the wrong place. We would rather fix that than argue about it.

Most heat-reuse projects spend their budget moving heat across a city. We skip the trip and put the compute into a hydronic loop someone already pays to run. That is a design, build and commission problem. We have done each for a living.

Between us: a licensed Professional Engineer who spent a decade commissioning mechanical, electrical, plumbing and fire-protection systems and wrote the study guide for Decarbonization Professionals. Engineering leadership at businesses that scaled to nine-figure revenue. A production lead who went from owning a bakery to building commercial fusion generators. And the go-to-market that turns a heater into a business.

Every one of us has owned a business and signed the front of a check. That is the whole job.