SMARTER HOT-WATER CONTROL
GeyserWise Controllers
Take better control of your geyser or solar water-heating system. GeyserWise controllers let you monitor water temperature, manage heating times and identify system problems more easily.
ABOUT GEYSERWISE
More Control Over How Your Water Is Heated
A household geyser is one of the largest users of electricity in many South African homes. A GeyserWise controller helps you manage when the geyser heats, view the current water temperature and monitor important operating conditions.
Different GeyserWise models are designed for conventional electric geysers, thermosyphon solar systems, pumped solar systems and PV water-heating installations. Choosing the correct controller depends on how your system produces and circulates heat.
Developed for South African conditions
GeyserWise was established in 2004. Its early controllers were developed and tested with assistance from the Cape Peninsula University of Technology, and the product later received recognition in the residential category of the 2010 ETA Awards.
01
Monitor Temperature
See the current water temperature and heating status on a clear controller display.
02
Schedule Heating
Set heating times around your household routine instead of heating water unnecessarily.
03
Spot Faults
Error codes and system alerts can help identify operating problems that need attention.
04
Manage Solar Systems
Selected models control pumps, temperature differentials or AC and DC heating modes.
COMPARE THE RANGE
Which GeyserWise Controller Do You Need?
The right model depends on whether you have a standard electric geyser, a thermosyphon system, a pumped solar system or a PV water-heating installation.
MULTI-PURPOSE CONTROL
GeyserWise Max
For conventional geysers, thermosyphon solar systems and pumped solar systems.
PV WATER HEATING
GeyserWise Dual
Controls conventional AC heating together with a GeyserWise PV water-heating system.
PUMPED SOLAR SYSTEMS
GeyserWise Delta T
Timer and differential controller for a 230V pumped solar water-heating system.
TIMER & THERMOSYPHON
GeyserWise TSE
For standard geyser timing or temperature control on a thermosyphon solar system.
VERSATILE CONTROLLER
GeyserWise Max
A flexible controller for standard electric geysers and different types of solar water-heating systems.
Standard geyser timer
- Displays water temperature, time, day, heating mode and fault conditions.
- Automatic or manual heating control.
- Adjustable temperature from 30°C to 65°C, with a 55°C factory default.
- Four temperature settings and four daily timer settings.
- Error alerts E1 to E7.
- Electronic thermostat with a mechanical thermal cut-out at 90°C.
Thermosyphon solar-system timer
- Displays conditions for both the solar system and geyser.
- Automatic or manual heating with four temperature and timer settings.
- Error alerts E1 to E7.
- Electronic thermostat with a 90°C mechanical thermal cut-out.
Pumped solar-system controller
- Timer and differential control for 12V and 220V systems.
- Displays geyser and solar-system temperatures and operating conditions.
- Error alerts E1 to E9.
- Automatic or manual heating control.
- Operating voltage: 230VAC / 50Hz.
- Main relay contact rating: 30A, maximum 4kW.
- Secondary pump and solenoid relays: 5A.
- Operating voltage range: 160V–250V AC.
- Earth-leakage protection at 25mA; action time 0.1 second.
- Temperature display range: 0°C–99°C.
- High-temperature warning above 84°C.
- Electrical heating temperature range: 30°C–65°C.
- Heat-failure detection when temperature rises by less than 4°C per hour.
- Electronic thermostat with mechanical thermal cut-out at 90°C.
- Dry-heat detection for an empty cylinder.
- Temperature tolerance: ±2%.
- Temperature differential setting: 1°C.
- Switching differential: 6°C.
- Second temperature probe for solar.
- Solar differential: 7°C.
- Collector and tank probe-failure detection.
- Geyser probe range: -30°C to +130°C.
- Collector probe range: -30°C to +260°C.
- Isolates live and neutral while off.
- Collector antifreeze protection at 5°C.
AC + DC CONTROL
GeyserWise Dual
Designed to manage a conventional electrical supply together with a GeyserWise PV water-heating system.
Standard geyser timer
- Displays water temperature, time, day, heating mode and fault conditions.
- Automatic or manual heating.
- Four temperature settings and four daily timer settings.
- Error alerts E1 to E7.
- Electronic thermostat with a 90°C mechanical thermal cut-out.
GeyserWise PV water-heating control
- Displays conditions for the PV system and geyser.
- Temperature settings from 30°C to 65°C.
- Factory defaults of 55°C for AC and 65°C for DC heating.
- LDR control manages AC versus DC heating mode.
- Operating voltage: 230VAC / 50Hz.
- Main relay rating: 20A, maximum 3kW element.
- Operating range: 160V–250VAC.
- Control circuit: 5.5–12VDC.
- Earth-leakage protection at 25mA; action time ≤0.1 second.
- Recommended ambient temperature: -20°C to 55°C; maximum 75°C.
- Temperature range: 0°C–200°C.
- DC on at set light value up to 75°C.
- DC differential: 3°C–7°C.
- AC temperature range: 30°C–65°C.
- AC heat-failure detection at a rise of 4°C or less per hour.
- Mechanical thermal cut-out at 90°C.
- Dry-heat detection for an empty cylinder.
- Temperature tolerance: ±5°C.
- Temperature differential: 1°C.
- AC element switching differential: 6°C.
- LDR light-detection sensor.
- LDR setting: 150–200.
- Tank probe-failure detection.
- Geyser probe range: -30°C to +130°C.
- Light-level range: 0–230.
- Isolates live and neutral when the element is off.
- Class 1 insulated control box.
- Operating life: 50,000 cycles.
PUMPED SOLAR CONTROL
GeyserWise Delta T
A timer and differential controller for a 230V pumped solar water-heating system.
Timer and differential control
- Displays water temperature, time, day, heating mode and fault conditions for the solar system and geyser.
- Automatic or manual heating.
- Temperature adjustment from 30°C to 65°C.
- Four temperature settings and four daily timer settings.
- Error alerts E2 to E5 and E7 to E9.
- Differential control for a 230V pumped solar system.
- Operating voltage: 230VAC / 50Hz.
- Main relay rating: 20A, maximum 4kW.
- Secondary pump relay: 5A.
- Operating range: 160V–250V AC.
- Temperature display range: 0°C–200°C.
- High-temperature warning above 85°C.
- Electrical heating range: 30°C–65°C.
- Heat-failure detection below a 4°C-per-hour rise.
- Electronic thermostat with 90°C mechanical cut-out.
- Dry-heat detection for an empty cylinder.
- Temperature tolerance: ±2%.
- Temperature differential: 1°C.
- Switching differential: 6°C.
- Second temperature probe for solar.
- Solar differential range: 7°C–15°C.
- Collector and tank probe-failure detection.
- Geyser probe range: -30°C to +130°C.
- Collector probe range: -30°C to +260°C.
- Isolates live when off.
- Collector antifreeze setting: 0°C–10°C.
TIMER & THERMOSYPHON
GeyserWise TSE
A practical timer and temperature controller for conventional geysers and thermosyphon solar systems.
Standard geyser timer
- Displays water temperature, time, day, heating mode and fault conditions.
- Automatic or manual heating.
- Temperature adjustment from 30°C to 65°C.
- Four temperature settings and four daily timer settings.
- Error alerts E2 to E5.
- Electronic thermostat with a 90°C mechanical thermal cut-out.
Thermosyphon solar-system timer
- Displays operating conditions for both the solar system and geyser.
- Automatic or manual heating control.
- Four temperature settings and four programmable daily times.
- Error alerts E2 to E5.
- Operating voltage: 230VAC / 50Hz.
- Main relay rating: 30A, maximum 4kW.
- Operating range: 160V–250V AC.
- Temperature display range: 0°C–99°C.
- High-temperature warning above 84°C.
- Electrical heating range: 30°C–65°C.
- Heat-failure detection below a 4°C-per-hour rise.
- Mechanical thermal cut-out at 90°C.
- Dry-heat detection for an empty cylinder.
- Temperature tolerance: ±2%.
- Temperature differential: 1°C.
- Switching differential: 6°C.
- Tank probe-failure detection.
- Geyser probe range: -30°C to +130°C.
PROFESSIONAL ADVICE & INSTALLATION
Not Sure Which Controller Fits Your System?
Tell us what type of geyser or solar water-heating system you have. We’ll help identify the appropriate controller and provide a quotation for installation.