Turn Curtailed Energy Into Hot Water and Cashflow
We replace immersion heaters with programmable ASIC units that absorb surplus renewable power and create three outputs: hot water, Bitcoin revenue, and demand flexibility income.
The UK wastes billions in clean energy every year
When renewable generation exceeds grid demand, operators pay wind and solar farms to stop producing. This curtailment cost UK bill-payers £1.46 billion in 2023 alone, wasting 4.6 TWh of clean electricity.
Today: Energy Wasted
With GWhFi: Energy Used
One device. Three value streams.
GWhFi is a programmable ASIC heater for standard hot-water cylinders. It turns surplus electricity into heat and monetisable compute, with flexibility participation layered in as deployments scale.
Hot Water
Our ASIC heater replaces a standard immersion element. Compute power is captured as heat and stored in the cylinder for domestic hot water.
Bitcoin Revenue
While heating water, the device mines Bitcoin. That revenue helps offset operating costs and can improve pilot economics.
Grid Flexibility Payments
Aggregated units can act as controllable demand, absorbing surplus generation and participating in flexibility programs where eligible.
See it in action
Every GWhFi unit reports real-time telemetry to the SmartWater Dashboard. Monitor heater status, power draw, energy consumption, and thermal output from anywhere.
SmartWater Dashboard
Intelligent Heating Dashboard
The scale of the opportunity
Running renewable assets or hot-water infrastructure?
Book a 20-minute pilot call. We will assess site fit, expected energy absorption, and commercial structure for a first deployment.
Start with a commercial pilot
Best fit today: sites with high hot-water demand and access to flexible power.
From surplus electrons to hot water and revenue
A single unit replaces the immersion element in a household cylinder. It is remotely managed and designed to deliver hot water with optional revenue sharing where available.
Built with the ecosystem
GWhFi collaborates across research, regulation, hardware, and industry to deliver a fully integrated energy flexibility platform.
Research
Academic partners validating thermodynamic models and grid integration strategies.
Grid
Regulatory and system operator engagement for flexibility market access.
Hardware
ASIC hardware partners providing mining-grade silicon optimised for thermal deployment.
Industry
Working with generators, DNOs, and hot water cylinder manufacturers to integrate across the value chain.
From analysis to national deployment
Curtailment data analysis, economic modelling, and identification of the UK hot water cylinder opportunity.
Collaboration with Universities on thermodynamic and grid integration feasibility.
First ASIC heater prototype built with Winchain, validated in lab conditions for heat output and hash rate.
Initial deployment in commercial hot water systems. Real-world data on energy absorption, revenue, and grid interaction.
Cloud-based fleet management, NESO integration, and demand-side response qualification.
Scaled deployment into UK households. Consumer-ready product, installer partnerships, and national rollout preparation.
The team behind GWhFi
Pavel Grachev
Founder
Pavel is a technologist with deep experience across grid infrastructure, distributed energy resources, and programmable hardware. He founded GWhFi to solve a simple but costly problem: the UK generates more clean energy than it can use, while millions of hot water cylinders sit idle as untapped thermal stores. GWhFi bridges that gap with purpose-built hardware that turns waste into value.
pavel@aidala.uk