The PowerSpout PHP turbines commonly achieve 40-50% efficiency (at input powers over 200W) over a very wide range of pumping heads, which is superior to water rams. This ingenious little device will give you years of trouble free water pumping, avoiding the need for more expensive alternative solutions. Not only does the PowerSpout PHP give you renewable energy, it is also made from a high percentage of recycled materials, making it one of the most eco-friendly microhydro pumps available on the global market. For a list a PHP turbine advantages relative to conventional water rams refer to click here