
Everyone wants a pond pump that will perform well for them, and at the same time not cost too much to operate. Remember again:
What determines the performance of a pump?
What affects the initial purchase price of a motor? How about the operating cost of a motor? Would you believe that many elements that increase the initial purchase price, actually reduce the operating cost. For instance:
The operating cost of a motorpump combination is the cost of electricity that the pump uses.
How much would you save over 5 years if you could reduce the amps from 10 to 2.6? Would you believe $2,400? How much more would you save if you ran the pump at an average 65% of its design speed, resulting in a savings of 71%; reducing the amps to 0.75 amps? You would save another $1,850 for a total savings of $4,250; an annual operating cost of $150? How much more would you be willing to pay for a pump that could save you $8,500 over a 10 year lifetime? The following table shows the amps the more popular pumps draw as a function of horsepower.
Another factor to consider is since we started focusing on the amperage used, many manufacturers' of less efficient pumps have now dropped amperage totally, and only report wattage. To make comparisons even worse some of them are using the motor's "Power Factor" to lower the wattage, which gives an artificially low wattage, i.e., Volts x Amps x Power Factor. In general the cheaper motors have lower Power Factors, which tempts them to report an artificially low "wattage". So for instance, a 115 volt motor that draws 4 amps would be 460 watts, however, with a Power Factor of 0.8 many manufacturers will report the wattage as 460 x 0.8 = 368 'watts'. So they report 368 watts for a 115 volt motor that really draws 4 amps.

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