Turn your electric boiler into a smart thermal battery.
The Boiler Controller (BC) transforms an ordinary electric boiler into a fully-fledged smart heat battery. It reads the surplus from your electric meter in real time and modulates the boiler accordingly: when you produce more than you consume, that energy goes straight into the heater instead of back to the grid.
The result: free solar and cheap dynamic-tariff energy stored as hot water — with no extra battery hardware.
Paired with Powerbaas, Home Assistant, or Domoticz, the Boiler Controller steers your boiler fully automatically based on solar surplus or the lowest electricity prices. You save directly on your energy bill and relieve pressure on the grid.
By integrating with your real-time energy data, water heating becomes fully automated:
- ☀️ Use your solar surplus — Producing more than you consume? That free energy flows straight into your smart heat battery instead of back to the grid.
- 💶 Profit from low electricity prices — On a dynamic tariff? The system knows exactly when prices are lowest (or even negative) and switches the boiler on at those moments.
- 🌱 Increase self-consumption — Less export, more of your own clean energy actually used at home. Smarter and more sustainable.
The Boiler Controller is designed for maximum flexibility. No closed ecosystem — full freedom to build the smart setup you want.
| Capability | Details |
|---|---|
| 🔌 Connectivity | Read data directly via Modbus or Pulse input |
| ⚙️ Control | Switch heavy loads via SSR or modulate precisely with the 0–10V output |
| 🌡️ Monitoring | Real-time monitoring with temperature sensor + seamless Home Assistant integration |
Whatever your setup, the Boiler Controller has the interface you need.
Today, the Boiler Controller works with Powerbaas, Home Assistant and Domoticz. You define your own rules and automations, such as:
- 🔥 Only heat when the electricity price is below 15 cents
- ☀️ Use solar surplus to heat water
- 🕖 Make sure the water is up to temperature every morning
Coming soon:
- ✅ Homey support
- 📱 A dedicated app for direct control — no third-party home-automation platform required
In this phase, the Boiler Controller is a DIY solution: you install it yourself and integrate it with your existing setup, with full freedom to automate it your way.
© 2025 – 2026 BoilerController — Make your boiler smart.