A parabolic trough is used to reflect direct solar radiation towards a pipe that contains a receiver fluid which runs through the trough. You can make a DIY solar heating parabolic trough for your home. It can be used as a solar cooker, or a way to heat your water supply.
For this simple DIY project [...]
Source Article: DIY Solar Heating Parabolic Trough</a
True! the parabolic is best suited for heating for the water and it saves a lot of non-renewable source of energy.But when renewable source is inconsistent we need to store this renewable which can prove to be very expensive or are suitable for large solar thermal power plant. but still we can always keep it as an option and use it whenever we can because of its inconsistent nature.