*Paying for heat is so last century*

# The heater that pays you back.

Heatoshi is the world's first self-contained residential hydronic heater based on computationally generated heat. Set a temperature. The patent-pending system inside warms your water loop and earns rewards for the work it does. Have Fun Staying Warm™.

- [Visit the storefront](https://heatoshi.xyz/)
- [How it works](https://promethean.is/heatoshi#how)

*How it works*

## Same heat. Different element.

1. **Set your target temperature.** In the app, like any thermostat. Heatoshi runs its hardware exactly hard enough to hold it.
2. **The hardware does paid work.** Heatoshi runs Bitcoin proof-of-work, converting electricity to heat at near 100% efficiency.
3. **Water carries the heat.** A small volume of pure water recirculates silently and carries the heat to a room, a pool, or a barn.
4. **Rewards offset the bill.** The app shows target and current temperature, water flow, power draw, and average daily revenue side by side.

*Designed for homes*

### Efficient

The patent-pending design converts electricity to heat at near 100% efficiency.

### Economical

Bitcoin proof-of-work and energy recovery produce heat that can pay for itself.

### Sustainable

Uses a small volume of pure water and recirculates it silently.

### Upgradable

Modular hardware and software add abilities over time, so Heatoshi serves you for years.

### Easy to use

Set a target temperature in the app. Heatoshi does the rest.

### Scalable

Starts at 3.5 kW of heat and scales up.

*Proven in the field*

## Our first prototype cut a pool's heating bill by 43%.

Installed as an electric pool heater, the prototype delivered a consistent 4.8 kW of heat. The production model is 80% smaller, with 30% lower cost of goods and 40% fewer critical parts.

**$14** Average daily electricity cost

**$6** Average daily return

**43%** Net savings

- [Run your own numbers](https://calc.heatoshi.xyz/)

*Two pathways to ownership*

## Heatoshi is a productive asset that can pay itself off over time.

### Full ownership

- Retail purchase at full price
- All rewards kept by the owner; no guarantee of profitability
- Fully unlocked, expert mode

### Heatoshi-subsidized

- Service agreement, priced below retail
- Rewards pay off the cost of the unit; guaranteed monthly return
- Fully managed, novice mode

*Specifications*

**Heat output**: From 3.5 kW, scalable
**Heat transfer**: Hydronic: a sealed, recirculating water loop
**Compute**: Bitcoin proof-of-work
**Control**: Companion app: target temperature, current temperature, water flow, power draw, daily revenue
**Applications**: Homes, offices, pools, hot tubs, barns, domestic hot water and more
**Status**: Shipping soon — pilot installations in progress.
**Availability**: [heatoshi.xyz](https://heatoshi.xyz/)

- [Visit the storefront](https://heatoshi.xyz/)