Senztek Controllers

Senztek Solar Hot Water Controllers & Replacements

Senztek controllers are widely used in Australian solar hot water systems to manage circulation, temperature control, and heating cycles.

If your system is not working correctly — no hot water, incorrect temperatures, or the pump not running — the controller is often the cause.

We supply a range of Senztek replacement controllers to suit different system types, including solar circulation systems, electric booster control, and heat pump systems.

✔ Not sure which Senztek controller you need?

Different Senztek controllers perform different functions. Choosing the correct one depends on your system type and setup.

Solar circulation controllers (SolaStat)

These controllers manage water circulation between the roof collectors and tank using temperature sensors.

• Used in most solar hot water systems
• Controls pump operation
• Models include: 1-2, 1-3, and 2-3 sensor controllers

Booster element controllers (AlphaStat)

These controllers manage the electric heating element in your system.

• Controls when the system heats using electricity
• Helps reduce energy usage
• Ideal for systems with electric backup heating

Heat pump controllers (Reclaim systems)

These controllers are designed specifically for heat pump hot water systems.

• Controls heating cycles based on tank temperature
• Suitable for Reclaim CO₂ heat pump systems only

✔ Common signs your controller needs replacing

• No hot water or poor heating
• Pump not turning on
• Incorrect temperature readings
• System overheating or shutting down
• Heat pump or booster not operating correctly

✔ Choosing the right controller

• 1-2 controller: systems with 2 sensors (roof + tank)
• 1-3 controller: systems with 3 sensors (roof + tank + inlet)
• 2-3 controller: flexible option for systems using 2 or 3 sensors

If you’re unsure, the 2-3 controller is often the safest replacement option.

✔ Why choose Solar Hot Water Parts?

• Wide range of Senztek replacement controllers
• Solutions for discontinued and hard-to-find systems
• Practical experience with solar hot water repairs
• Australia-wide delivery

✔ Need help choosing?

If you’re unsure which controller you need, we can help identify the correct replacement for your system.

👉 Contact us or request a part and we’ll guide you to the right solution.