Liberty vs Zoeller Sump Pumps comparison reveals both brands utilize the same basic components: a corrosion resistant body to protect and hold the motor, a float and switch to respond to the height of the water in the pit so as to trigger the switch to activate the motor, a vortex impeller to cause a centrifugal force with the aid of motor power to whirl the water from the basin up and out the discharge pipe system, a power cord to send electrical power to run the motor. Aside from these basic similarities, the detailed design and material used by both manufacturers varies. Learn for yourself the differences between the two manufacturers and decide for yourself which differences are most important for your water pumping needs.
Zoeller is the older of the two companies. Liberty Pumps was founded in 1965 with its headquarters in Bergen, New York. Zoeller was founded in 1939 with its headquarters in Louisville, Kentucky. Zoeller has the distinction of being one of the oldest family-owned pump manufacturers in North America. Surprisingly its first model was known as the column or pedestal.
The ownership of both companies is quite similar: Liberty is family and employee owned. Zoeller Is family owned; however a family-employee owned business provides more incentive for employees to work hard and do a good job. Family ownership means less bureaucracy, more deeply rooted traditions and values with ability to establish relationships with management and flexibility to make changes.
Liberty and Zoeller both include sump pumps, sewage, effluent, drain, grinder, preassembled sump pump with battery backup system, preassembled sewage systems and accessories. In addition Zoeller carries elevator/vault pump-systems.
Both companies test each pump before it leaves the factory. Each pump goes through a leak test to ensure that all gaskets, seals and mating surfaces will hold under pressure. However, Zoeller powers up each pump which is run underwater to ensure that it is capable of its published head capacity and flow rate. This testing guarantees the pump will operate when installed.
Many models have peripheral openings approximately two inches above the entire base, others have the vortex style impeller and the three-quarter horse power pumps have the vortex impeller and a bottom screen; however there are legs to elevate it above the basin floor. Zoeller consistently uses the vortex impeller without bottom screens and peripheral openings around the base. If there is no debris and only limited very small pebbles all of these designs will function well. Debris could clog peripheral openings around the base. Vortex impellers can handle pebbles limited to less than the size mentioned in the features without clogging
Both offer one-fourth, one-third, and one-half horse power pumps. Liberty offers a three-quarter horse power pump as well. Comparing same horse power pumps shows Zoeller half HP pumps gives more pump performance. The Liberty 280 series one-half HP pumps 62 GPM at 5 feet totally dynamic head; 56 GPM at 10 feet and 49 GPM at 15 feet Total Dynamic Head while Zoeller M95 and M98 one-half HP pump performance is 80 GPM at 5 feet, 67 GPM at 10 feet and 50 GPM at 15 feet total dynamic head.
Liberty Pumps 290 series three-quarter HP pump performance at 5 feet is 78 GPM, at 10 feet is 72 GPM and at 15 feet is 65 GPM while Zoeller most powerful one-half HP M137 pump performance at 5 feet is 90 GPM, at 10 feet is 75 GPM and at 15 feet is 65 feet.
Liberty-Pumps amp usage ranges from .4 to 1.0 amp usage lower.
All Zoeller motor housing is cast iron. Even though M72, M73, and M75 have an outer thermoplastic-housing, the motor-housing is cast-iron. Liberty uses only one housing (There is no motor and pump-housing. There is only a motor-housing.) so for 230 and 450 series it is aluminum.
Liberty Pumps sump- pump impellers are consistently made from polymer. Zoeller uses engineered plastic for some of its pumps; however models M57, M63, M95 and M137 have a cast iron impeller. Plastic impellers work fine if there are no small pebbles in the pit. Small pebbles nick the impeller eventually causing it to fail.
Both use the tether and vertical float switches. However, the style for the vertical float switch is different. Zoeller uses a 2 pole vertical mechanical float switch. The float is much larger (3 inches long by 2 inches wide), puncture proof because it is solid, buoyant, and made of polypropylene. Liberty uses the vertical magnetic float switch (the float is 1 inch long by 1 inch wide). Both switches need replacement every 3 to 5 years; however only Zoeller switches can be purchased on Amazon.
Liberty parts are available for purchase at LibertyPumps website. Zoeller parts are available to buy on Amazon.
Liberty consistently offers a three year warranty; however Zoeller offers five years for two models. Zoeller offers a one year warranty on all pumps with thermoplastic outer housing; 3 year warranty on cast-iron housing which includes the Mighty Mate Series and the Flow Mate Series except for two models which have been upgraded with a 5 year warranty for the Model M63 and M95.
Zoeller consistently uses cast iron for the motor housing. In addition each pump has a pump housing. The Mighty Mate and Flow Mate series have a cast iron housing except for M55, M59 and M139 which are bronze, and the Builders series have a thermoplastic pump housing.
Since Liberty uses only one housing, the 230 and 450 series are aluminum, the 240, 250, 280 and 290 series are cast iron housing.
Zoeller company manufacturers and uses only USA made parts. Liberty Pumps Manufacturers and assembles their parts in the USA however some parts may be imported.
Zoeller cast-iron-housing-pumps weigh more than Liberty cast iron pumps. Liberty 290 Series weighs 31 pounds whereas the M137 weighs 45 pounds. Some of the weight can be attributed to the fact that many Zoeller models have cast iron impellers and cast iron motor housing whereas Liberty pumps have polymer motor housing. The weight is the same when comparing Zoeller M49 with thermoplastic outer housing to the Liberty Aluminum housing 240 Series. They both weight 11 pounds.
The 290 Series, which are Liberty greatest horsepower pumps, are 13-inches tall and 10-inches wide. The Zoeller M137, which is the greatest horsepower pump, is 12.75-inches high and 12-inches wide. The lowest horsepower 230-Series is 10.5-inches high and 9.6 inches wide. The Zoeller M53 is 10-1/16-inches tall and 10-3/32-inches wide.
The standard cord length for Liberty-Pumps is 10 feet. Zoeller-Pumps standard cord length is 9 feet. Special cord lengths of 25, 35 and 50-feet are available for Liberty-pumps. 15, 25 or 35-feet cords are available for Zoeller-pumps. In additional Liberty has a patented Quick Disconnect for the power cord without breaking the seal.
Liberty-Pumps has a unique motor body design which eliminates one of the housing seal rings. The one-body casting is known as the UNI-body. The 240, 250, 280 and 290-Series-pumps are designed this way.
Liberty-Pumps with a vertical magnetic float have no float switch seals to fail. The switch is completely detached from the cap (pump cover) which makes replacement fail proof. The switch is activated through a plastic cover. The models include 237, 247, 257, 457, 287 and 297.
Liberty-Pumps shut-off head seems to average 5 to 10 feet more.when comparing Zoeller-pumps with similar pump performance. Though the maximum head is greater the pumping performance at 5 and 10 feet is not more.
The cost for both brands is comparable, except when comparing the pumps with the highest pump. performance curve, the Liberty 290 Series and the Zoeller M130 Series, The Zoeller M137 cost approvimately $40 more. The additional cost is associated with the fact that the M137 has more cast iron components.
The comparison Liberty vs Zoeller Sump Pumps has been provided to help you decide which brand features and specifications are most important for your water pumping needs.
We wish you much success in finding the sump pump that best meets your water pumping needs.
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