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  • +27 (0)12 653 1494
  • +27 (0)76 5733 785
  • Physical Address: 137 Edison Cres, Unit 11, Edison Square Office Park, Hennopspark, Centurion


Solar water heaters use the radiation from the sun to generate heat. The size of the solar panel will determine how much energy can be collected from the sun. For example if you have a 4sqm or bigger flat plat solar panel connected to a 300L geyser, this should give you 300L of 60°C water at the end of a warm sunny day. The same applies with an evacuated tube system, whereby the bigger your geyser, the greater the number of tubes you need to heart your water.

During cooler days with less sunshine you may still need a geyser element to supplement your hot water heating usage. Today, solar systems are installed with very smart timing systems which allow you to specify time zones for when you want to have hot water, for example at night between 6pm and 9pm when you take your bath, and again in the morning between 5am and 8am. Your system will work to ensure that you always have hot water during these times to the specific temperature. If the temp drops to below your specified requirement and there’s no sunshine at that time to reheat it, your system will kick back to the geyser element to supplement your hot water. It will only do this if necessary, so the savings are significant. In fact, a properly-sized solar geyser can cut your monthly electricity bill by anywhere between 30-40% of your total cost.

When going solar, as a rule of thumb, each person in the household uses around 70 litres of hot water a day. Check with your supplier about the size and the power output of the system. An under-sized or low efficiency system will result in insufficient hot water and a poor realisation on electricity savings, defeating the whole purpose of why you bought the system.


The heat pump uses a small amount of electricity to extract a lot of the latent heat energy from the surrounding air. So a heat pump is also using the energy from the sun but only indirectly and so it can work day and night, winter and summer. The efficiency of a heat pump is called the COP (Coefficient of Performance). A COP value of 4 means that the heat pump produces four times as much thermal energy as what it uses electrically – in other words a 75% saving on the water heating bill. Using a COP value of 4, a high efficiency 4.7kW heat pump takes about 3 hours to re-heat a 200L geyser from a cold start. This enables you to always have hot water at a fraction of the cost no matter when or how much water you use. Unlike the solar option, a heat pump also requires virtually no change to your lifestyle and routine as it is not limited by the availability of the sun for heating. The main advantage of a heat pump is the ability to re-heat a geyser a few times per day and that it can work day and night, rain or shine.


Hy-Energy is the exciting new renewable energy division of Hybrid Electrical and Plumbing. Hybrid Electrical and Plumbing was established in 1992 and is operating as electrical and plumbing contractors from their offices in Centurion. The company has grown over the past 25 years with 80 permanent employees ranging from semi-skilled to qualified Electricians and plumbers. Due to high demand in alternative electricity generation and ongoing grid failures in South Africa, Hy-Energy was established.

Tel: 012 653 1494
Cell: 076 5733 785
137 Edison Cres,
Unit 11, Edison Square Office Park,
Hennopspark, Centurion