1 Purpose and Functions
A high-quality electric heating element designed for heating domestic hot water (DHW) in tanks with a capacity of 50 to 200 liters. The device is designed for effective integration with renewable energy systems, particularly photovoltaic panels and low-voltage wind turbines.
The heater features a unique design consisting of three independent heating coils housed in a single brass flange. This construction allows for flexible power management by bridging the coils or connecting them independently to various power sources. The device is versatile in terms of power type, capable of operating on both direct current (DC) and alternating current (AC).
Main Features:
- ✔ High-quality brass flange (5/4")
- ✔ Sturdy construction ensuring long service life
- ✔ Three independent heating coils in one unit
- ✔ Made of SUS304 stainless steel
- ✔ Complete set with a dedicated gasket
- ✔ Compatible with both direct current (DC) and alternating current (AC)
Connection Configuration
Thanks to the three independent coils, the user can adjust the load to match the power source capacity. The coils can be connected in parallel to obtain the full power of 300W at 12V or powered from separate panel/turbine sections.
2 Technical Specifications
| Model | ACTii AC2426 |
| Operating voltage | 12V DC / AC |
| Rated power | 300W (1x 300W total coil power) |
| Thread type (Flange) | 5/4" (1 1/4 inch) Brass |
| Heating element material | SUS304 Stainless Steel |
| Heating element length | 210 mm (from flange) |
| Total length | 240 mm |
| Heating element diameter | 8 mm |
| Recommended tank capacity | 50 - 200 liters |
| Product weight | 367 g |
| Kit contents | Heater, rubber gasket |
3 Installation and Connection
Mechanical installation:
- Ensure the DHW tank is drained of water below the level of the mounting hole.
- Check the condition of the thread in the tank (5/4" hole required).
- Place the included gasket on the brass flange of the heater.
- Screw in the heater by hand and then tighten with an adjustable wrench, taking care not to damage the brass thread.
- Fill the tank with water and check the connection for leaks before connecting power.
Electrical connection:
The device features terminals for three independent coils. They can be connected in the following ways:
- Parallel connection: By connecting all three coils together, you achieve a maximum power of 300W at 12V.
- Selective connection: Possibility to connect only one or two coils in case of lower availability of energy from renewable sources.
- DC/AC Power: The heater works correctly when powered by both batteries/panels (DC) and low-voltage transformers (AC).
4 Safety and Maintenance
Safety Rules:
- DO NOT RUN DRY: The heater must be completely submerged in water during operation. Starting without water will cause the coils to burn out immediately and void the warranty.
- The supply voltage should not exceed the rated 12V by more than 10%.
- All installation work must be carried out with the power disconnected.
- The tank must have a functional pressure relief mechanism (safety valve).
Maintenance:
- Regularly check for limescale deposits on the heating elements. Excess limescale can lead to overheating and damage to the heater.
- In case of hard water, it is recommended to use water softening systems.
- Periodically check the tightness of electrical terminals – loose contacts can cause wires to heat up and pose a fire risk.
5 Troubleshooting
| Problem | Possible cause | Solution |
|---|---|---|
| Heater does not heat | No voltage or burned coil | Check fuses and voltage at the terminals. Measure coil resistance with a multimeter. |
| Leak at the flange | Improper sealing or loosening | Tighten the heater or replace the gasket with a new one. |
| Poor heating performance | Voltage too low or limescale buildup | Check the power source capacity (panels/wind). Clean limescale from the heater. |