The Senztek SolaStat-Plus 2-3 solar hot water controller is a widely used replacement for systems that are not circulating properly, failing to heat, or showing incorrect temperature readings.

If your solar hot water system is not working correctly, the controller is often the cause. This model runs three sensors (roof, tank and inlet) and has a second output to control the electric booster element. It restores accurate temperature control and reliable pump operation.

This is a common solar hot water controller replacement for systems using Senztek 2-3 configurations. Used by plumbers and solar technicians across Australia for system repairs and upgrades.

Common signs your controller needs replacing

• No hot water or poor heating
• Pump not turning on
• Incorrect or fluctuating temperature readings
• System overheating or shutting down
• Intermittent or unreliable operation

Faulty controllers often show erratic temperature spikes or inconsistent readings in real systems

Compatible systems

This controller is commonly used in systems including:

• Apricus solar hot water systems
• Hills systems
• Dux solar hot water systems
• Chromagen systems
• Systems previously fitted with Senztek 2-3 controllers

Senztek controllers are widely used across many Australian systems and manufacturers

What this controller does

The controller compares temperatures between the roof, tank and inlet sensors to automatically control the circulation pump and optimise heat transfer throughout the system.

What you receive

• 1 x SolaStat 2-3 WR Controller
• 1 x 3m tank sensor
• 1 x 20m roof sensor
• 1 x inlet sensor
• Thermal paste and connectors

Why choose this controller?

• Proven reliability in Australian solar hot water systems
• Solar pump and electric element control in one unit
• Easy plug-and-play installation
• Pre-set settings for quick setup
• Widely used by plumbers and solar repair technicians

When this controller is suitable

• Replacing an existing Senztek 2-3 controller
• Three-sensor systems (roof, tank and inlet) where the controller also switches the electric element
• Faulty or ageing controller

Senztek controllers are widely used across Australian solar hot water systems and are known for reliable temperature control and system efficiency.

When it may NOT be suitable

• Tanks with only one sensor port. Use the SolaStat-Plus 1-2.
• Three-sensor systems that don’t need element control. The SolaStat-Plus 1-3 is the simpler choice.

Understanding the 2-3 controller

The 2-3 runs three s