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Another method of reducing the effects of Global warming is to use Photovoltaic (PV) systems.  However, these products use a totally different type of technology than what is used for “thermal water heating” to convert radiation from the sun into useable electricity, through storage batteries and inverters.  Whilst most people are looking to “save” electricity by creating electricity from PV systems, these systems do not offer the same level of economic benefits as a solar or heat pump water heaters.   At present, most PV systems provide an efficiency level of approximately 17% which means they can convert approximately 17% of any available radiation into useable electrical energy.  On the other hand the technology used for solar water heater collector panels for instance, has been developed over many years with most systems on the market today offering efficiency levels of 70% and sometimes higher.  This in turn means solar thermal water heater panels can convert approximately 70% of any radiation that is available into heating energy for the water.

In a general domestic household situation, particularly in developed Nations, the energy needed to heat the water in a standard electric hot water system can represent between 40% and 60% of the total energy use of that household.  Solar or Heat Pump Water Heaters can save up to 80% of that energy which works out to be almost 40% to 50% of the total energy requirement of each household.  If this is then compared to an average saving of around 17% in energy use from Photovoltaic (PV) Systems, it is easy to see that at this point in time, solar or heat pump water heaters offer a better financial outcome for home owners.  However, in Commercial applications such as hotels, motels, larger restaurants, gymnasiums, and many other similar institutions, the sheer level (kW) of energy that can be saved by using large capacity commercial heat pump water heaters is enormous.  Some Governments are offering attractive rebate schemes to encourage commercial users to take advantage of these energy efficient appliances, and it will be these installations (particularly the commercial type) that will have a significant impact on Global Warming.