Heat your home on power the grid can't use yet.
Compute installed inside the buildings it heats — running on surplus electricity, turning it into affordable hot water. Productive when it runs, harmless when it stops.
The Heat21 Node
From surplus power to warm water
Scotland pays wind farms to switch off when the grid can't carry their power. Heat21 puts that surplus to work: SHA-256 compute runs on a building's existing supply and captures essentially all the heat it makes.
Power in
The Node runs on the building's existing electricity supply, drawing hardest when the grid has power it would otherwise pay to waste.
Heat captured
A hydronic cold-plate captures 96.2% of the heat the hardware produces and moves it into a water-tank heat battery.
Warmth on demand
The tank holds 90°C water, so even a flexing load delivers steady heating and hot water whenever the home calls for it.
Productive, flexible, harmless
Going electric is the obvious answer — but heat pumps won't fit many homes, and resistive heat is costly to run. Here, the hardware that heats the water also earns from computing, paying the cost down.
Productive
Every watt does useful work before it warms the tank. The compute pays for itself while it heats — instead of burning energy for nothing.
Flexible
The heat battery decouples heating from load, so the Node can flex with the grid. Aggregated, the fleet behaves as a Virtual Power Plant.
Harmless
When it stops, it simply stops. No combustion, no emissions on site, no waste heat vented to nowhere.
96.2%
heat captured
8.3 TWh
wind curtailed, 2024
£393m
paid to switch off
90°C
water output
Warmth where a heat pump can't go
Homes now
Lower-cost heat and hot water for properties where a heat pump won't fit or won't pay — starting with the homes hardest to heat cleanly, one at a time.
Hotels & multi-flat next
Constant hot-water demand makes shared buildings a natural fit — the same Node, scaled to bigger tanks.
Industry & greenhouses next
Process heat and growing heat, delivered from power the grid would otherwise curtail.
Mined your heating yet?
The first installs are underway — we're documenting every step in the Telegram group. Tell us about a building, or come watch it happen.