Description
Geyserwise Delta T ESPHome Wi-Fi Controller Kit
Complete Local Smart Controller for Pumped Solar Water Heating Systems
Take complete control of your solar water heating system with the Geyserwise Delta T ESPHome Wi-Fi Controller Kit. Designed specifically for pumped (active) solar water heating systems, this complete controller kit combines intelligent differential temperature control with the power of ESPHome and Home Assistant for fast, reliable, and completely local smart automation.
Professionally modified and pre-flashed with ESPHome, the controller integrates seamlessly with Home Assistant, allowing you to monitor temperatures, automate pump operation, optimise solar energy harvesting, and manage your entire hot water system—all without cloud services, subscriptions, or vendor lock-in.
Whether you’re upgrading an existing Geyserwise Delta T installation or replacing an ageing controller, this kit provides a modern, privacy-focused solution for smarter solar water heating.
Need Geyserwise Accessories?
Looking for additional Geyserwise accessories such as flanges, probes, thermostats, sensors, or replacement parts? We can supply a wide range of genuine Geyserwise components. Simply email sales@smartpad.co.za with your requirements, and our team will be happy to assist you.
Complete Controller Kit
Everything required for installation is included.
The kit contains:
- Geyserwise Delta T display with integrated ESPHome Wi-Fi module
- Power supply and control unit
- Electronic thermostat
- High-temperature sensor probe
- Required cables and connectors
- Installation instructions
Designed as a complete replacement controller for compatible Geyserwise Delta T systems.
Native Home Assistant Integration
Built specifically for Home Assistant users, the controller comes professionally pre-flashed with ESPHome.
Benefits include:
- Automatic Home Assistant discovery
- Local Wi-Fi communication
- Native ESPHome integration
- Fast response times
- Simple firmware updates
- Fully local operation without cloud services
Once connected to your network, your solar geyser controller becomes another fully integrated Home Assistant device, ready for dashboards, automations, notifications, and energy management.
Intelligent Differential Temperature Control
Unlike conventional geyser timers, the Delta T controller continuously monitors both the solar collector and geyser tank temperatures.
It automatically manages the circulation pump to transfer heat only when useful solar energy is available, helping to:
- Maximise solar energy collection
- Reduce electricity consumption
- Improve overall heating efficiency
- Protect the solar system through intelligent pump control
This makes it ideal for pumped solar water heating systems where efficiency is critical.
100% Local Control
Keep complete ownership of your smart home.
Because ESPHome communicates directly with Home Assistant over your local network, you benefit from:
- No cloud dependency
- Greater privacy
- Faster automation
- Reliable operation during internet outages
- No subscription fees
- Complete control of your data
Everything stays on your network.
Powerful Solar Water Heating Automation
Integrate your solar geyser into advanced Home Assistant automations.
Monitor and control:
- Solar collector temperature
- Geyser water temperature
- Pump operation
- Heating status
- Temperature thresholds
- Notifications and alerts
Create automations such as:
- Run the circulation pump only when sufficient solar gain is available
- Enable electric backup heating during poor weather
- Heat water using excess rooftop solar PV production
- Pause heating during load-shedding
- Receive alerts if temperatures become unusually high or low
The result is a more efficient, intelligent, and responsive solar water heating system.
Designed for Pumped Solar Water Heating Systems
The Delta T controller is purpose-built for:
- Pumped (active) solar water heating systems
- Residential solar geysers
- Solar-assisted electric geysers
- Existing compatible Geyserwise Delta T installations
It provides a modern upgrade path for homeowners wanting local smart control without replacing their entire solar water heating system.
Modified & Fully Supported
Each controller is converted with an ESPHome-compatible chipset and thoroughly tested before dispatch.
Benefits include:
- Professionally assembled hardware
- Pre-installed ESPHome firmware
- Quality-tested operation
- Full product warranty
- Ready-to-install solution
No soldering or firmware flashing required.
Reduce Electricity Costs with Smarter Heating
Hot water heating is one of the largest household electricity expenses.
With Home Assistant automation, you can:
- Prioritise free solar energy
- Optimise pump operation
- Reduce unnecessary electric heating
- Schedule backup heating intelligently
- Integrate with energy monitoring and solar PV systems
This helps maximise solar performance while lowering ongoing energy costs.
Technical Highlights
| Specification | Details |
|---|---|
| Controller | Geyserwise Delta T |
| Firmware | ESPHome (Pre-installed) |
| Connectivity | Wi-Fi |
| Smart Platform | Home Assistant |
| Operation | Fully Local (No Cloud Required) |
| Solar System Type | Pumped (Active) Solar Water Heating |
| Included | Display, Power Supply, Thermostat, High-Temperature Probe & Cables |
Compatibility
This controller kit is compatible with:
- Geyserwise Delta T systems
- Pumped (active) solar water heating installations
- Selected compatible Geyserwise Max systems
Please verify your existing controller model before ordering. If you’re unsure, contact us and we’ll gladly help confirm compatibility.
Why Choose the Geyserwise Delta T ESPHome Wi-Fi Controller Kit?
The Geyserwise Delta T ESPHome Wi-Fi Controller Kit combines intelligent differential temperature control with the flexibility of Home Assistant and ESPHome, giving you complete local control over your solar water heating system. With automatic pump management, powerful automation capabilities, and cloud-free operation, it’s the ideal upgrade for homeowners who want to maximise solar efficiency while maintaining complete ownership of their smart home.
Professionally assembled, fully tested, and ready to install, this kit delivers reliable, future-proof smart control for your pumped solar geyser.
