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 sensors: the roof (collector), the tank (top of the cylinder) and the inlet (bottom of the cylinder). All three must be connected. The tank sensor provides the over-temperature (top-out) protection, and the controller shows an error if a sensor is missing. Its second output switches the electric booster element.
🔧 ✔ 1-2 vs 1-3 vs 2-3 (quick guide)
- 1-2 controller: roof + one tank sensor
- 1-3 controller: roof + tank + inlet
- 2-3 controller: roof + tank + inlet, plus electric element control
Senztek controllers are widely used across Australian solar hot water systems and are known for reliable temperature control and system efficiency.
❓ FAQs
Is this a replacement for my Senztek controller?
Yes, if your existing controller is a Senztek 2-3, or a three-sensor system that also controls the element.
How do I know if I need a 2-3 controller?
Check the model on your existing controller. If it's a 2-3, or your system has three sensors and the controller switches the element, this is the one. If you're unsure, email us a photo.
Can I use this instead of a 1-2 or 1-3 controller?
Not instead of a 1-2. It needs three sensors, so it won't suit a tank with a single sensor port. It can replace a 1-3 where you also want element control.
Can I install this myself?
Installation is straightforward, but a licensed tradesperson is recommended to ensure correct setup and safety.
Do I need to replace the sensors as well?
This controller includes sensors, and replacing them at the same time is recommended for best performance and reliability.
Who are Senztek?
Senztek is a local based New Zealand electronics designer and manufacturer that has had a huge impact on the Australian solar hot water market. Their quality range of solar hot water controllers has been purposely built to suit our climate. They supply a large number of leading manufacturers globally - Apricus; AAE; Bosch; Edson; Hills; Neopower; Rotex; SolarArk; Stratco; SolarOz; Solarland; Thermotec; Zen - just to name a few.
Their smart energy controllers include the SolaStat; SolaStat-Plus; SolaStat ST; SolaStat WR; AlphaStat; EcoStat; SolaStat-Pool and the new SolaSmart range. Senztek has spent many years developing and perfecting advanced algorithms and associated controllers able to deliver real savings for solar and electric hot water users.
Solar Hot Water Parts is an approved Senztek distributor of the complete Senztek range. We are continually extending our solar hot water spare parts catalogue to give you the best selection of solar hot water replacement parts to choose from.
We sell the widest range of spare parts to suit any solar hot water service, whether it be a flat plate panel or evacuated tube solar collector. The Solar Hot Water Parts range is now online and ready to order, with complete tech specs to ensure your seamless selection.
If you're unsure which part suits, simply contact us - click here
Download Senztek SolaStat Plus 2-3 manual
