Generally, there are 2 different kinds of solar water heaters. The first is a stand-alone heater that offers all the warm water for your house. The second is utilized as a pre-heater to warm the water coming into your existing water heater. The main distinction in between the two types is that a stand-alone heater will usually have a reservoir to keep the heated water and the pre-heater uses the existing hot water heater as a reservoir.
The part of a solar hot water heater where the water is actually heated by the sun is called a heat exchanger. The heat exchanger is the key element of the heater and there are various styles in use around the globe today.
A stand-alone solar water heater includes a storage tank to save the heated water, the heat exchanger, and the hoses or tubing to link them. In some applications, a one-way valve is installed into the system to prevent the backflow of cold water into the tank, and some systems use a little pump to accomplish this and ensure flow through the heat exchanger.
When a system can be set up properly, no pump is essential to achieve circulation through your heat exchanger as the natural convective current will do it free of charge (because hot water is lighter than cold water and will tend to rise to the top pulling cold water into the bottom as it does), however, if your specific application is such that the heat exchange unit can not be set on the same level as the storage tank (due to space for the tank and a proper location with readily available sunshine for the heat exchange unit), you may have to use a small pump to guarantee circulation through your system. For a really off-grid system, you can use a small 12-volt pump and power it with a solar panel. No battery is required since the solar water heater Malaysia just works when sunlight is readily available similar to the solar panel.
The pre-heater type is connected into the cold water supply line to your existing water heater. The method it works is to pre-heat the water entering your heater so it does not have to work as difficult as regular and in some cases, not at all. Water that is currently hot does not need as much heating, sometimes none at all. This is a good way to minimize the part of your energy costs that is utilized to offer warm water for your home while leaving your existing water heater in the system to guarantee a supply of warm water on cloudy days or other conditions where your solar water heater does not work as well.
This kind of solar water heater includes a heat exchange unit, the lines connecting it to the cold water supply, and your hot water heater. A pump is not required here because the pressure of the inbound water will achieve the blood circulation through the heat exchanger.
These units work specifically well in the summertime but arrangements must be made to protect the outside parts from damage resulting from freezing in the winter season. Usually, the heat exchanger and lines going to and from your house are the only outdoors parts and can be drained.
These are the two fundamental types of solar water heaters in use all over the world, today. They can be as easy in design as a garden hose pipe depending on the sun, or as complex as you want to make it with copper or PVC tubing in a sealed box and temperature-activated one-way valves and pumps. That is up to you to choose for yourself.