Electric Heating Element and Thermostat in Solar Water Heaters
There are situations where solar water heaters cannot provide enough heat for the water, especially during cloudy or winter months. For such cases, solar water heaters come equipped with a heating element and a thermostat, which ensure that the water remains at an ideal temperature regardless of weather conditions. Dual and triple energy solar systems include an electric heating element with a thermostat.
What Is a Heating Element?
The heating element is an electric resistor installed in the solar water heater system and is activated when the water temperature in the tank does not reach the desired level despite solar energy. This element functions as an “emergency solution,” providing the ability to heat water using electricity when the sun is insufficient to do so.
The heating element is usually placed inside the boiler of the solar water heater. Although it consumes electricity, its usage is limited and only activated when needed to support the main system.
The Thermostat and Its Importance
The thermostat is a critical component in the operation of a solar water heater. It regulates the water temperature in the system and ensures that the water remains at a stable temperature. As seen in the images below, the thermostat is the same as the ones found in regular electric water heaters since their role is identical in both cases.
Advantages of the Heating Element and Thermostat
- Autonomy and Reliability: The presence of a heating element and thermostat ensures a continuous supply of hot water even during periods with limited solar radiation.
- Safety: The thermostat prevents overheating of the water, protecting the system from potential damage caused by excessive heat.
- Comfort and Convenience: Ensures that water is always at the desired temperature, regardless of weather conditions or time since the last solar charge.
How Do the Heating Element and Thermostat Work Together?
When the sun cannot provide enough energy to heat the water, the electric heating element can be used to heat the water in the solar heater. However, this can prove particularly costly in cold climates. The element starts operating, and once the water temperature reaches the desired level, the thermostat switches it off. This process ensures that the water does not overheat and energy consumption remains limited.
Conclusion
The heating element and thermostat are essential components in modern solar water heaters. While solar energy is the primary source for heating water, the presence of these two components ensures uninterrupted hot water supply, energy savings, and increased comfort for the user. With proper adjustment and maintenance, the use of these systems can improve the efficiency of the solar water heater and reduce electricity costs.
MSc in Environmental Education
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