Introduction to Evacuated-Tube Solar Heating System

The most modern option for South Africans looking for a solar geyser is the evacuated-tube Solar Heating System. In terms of the water heater geyser price, this collector is a little more expensive. But there’s also a decline in the cost as it gains a bigger market share.

These type of collectors are most likely the way of the future, because simply put, they are better. They have many benefits which will be discussed in this article, but let’s take a look at how it works first.

How does the Evacuated-Tube Solar Heating System Work

The panel that collects the rays from the sun is a series of thick glass tubes. Within these glass tubes are more glass tubes. A vacuum is created when the air between the smaller and bigger glass tubes gets pumped out, leaving a thermal insulation layer.

This vacuum is one of the most important differences that set evacuated-tube Solar Heating System apart from the rest, because it prevents heat loss. On the inside of the inner glass tube is a special layer of aluminium nitrate or titanium nitride oxide, which helps to absorb more light over greater wavelengths. The slightly higher water heater geyser price is starting to make more sense, isn’t it?


The heat that is collected by the glass tubes is then absorbed by a backplate, which is typically made of copper, and finally, the heat reaches the glycol (heating fluid).

As the temperature of the glycol rises, it starts to move to the top of the collector and eventually turns into steam.

The heat from the steam is transferred to a heat exchanger, which in turn heats the water in the storage tank.

Why Evacuated-Tube Solar Collectors are Worth Considering

Solar Heating SystemThe most obvious reason is, of course, the efficiency these type of collectors provide. But there are many variables to take into account when thinking about solar energy. In this case, the tubes capture the infrared rays from the sun through the clouds.

Even though all collectors work a little bit during a cloudy day, evacuated-tube solar collectors work so much better. Here are some of the benefits you’ll be getting:

  • There is almost no water within the system, which means it can endure freezing conditions better
  • Thanks to the shape, the collectors have a wider angle and spend more time absorbing
  • The heat retention of the tubes are particularly impressive, which allows more use during overcast days and night time
  • If one tube breaks you don’t have to replace the whole panel because the tubes are independent of each other
  • It’s a great collector for areas with strong winds, seeing as the independent tubes allow air to pass in between
  • As mentioned earlier, the collectors are known for performing on cloudy days

Solar Heating System Cost

For something that costs around the same as a fancy kitchen appliance, you get free hot water, and a return on your investment. In other words, don’t get to caught up in the water heater geyser price, because the amount you save each month on your total electricity bill is staggering. There is no doubt that within the next 10 years, electricity powered Geysers will be the thing of the past. So let the sun give you free hot water!

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