sump pump hp rating?
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sump pump hp rating?
I picked up a sump pump today, I need something that pumped atleast 2500 gph, so I got what I needed there , but happened to look at the hp rating and it said 4/10 HP can someone tell me what that equates to? is it just under a 1/2 HP??wasn't good at math 
Fleet Mechanic
Joined: Jul 2003
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What you want to look at is how much water it will pump at the lift height you have, check graph on instructions or box. IE at 5 feet it may lift 2500 GPH. At 10 feet it may only lift 1400 GPH The "Shut Off" could be 25 feet, the height it will no longer lift water to. Note that on a lot of pumps you need to drill a small hole in the pipe even with the top of the pump. I like putting the hole so the water hits the top of the pump, to cut down on the noise. Without the bled hole you could become bound up with the check valve and won't pump water at all during restart in high demand times.
Fleet Mechanic
Joined: Jul 2003
Posts: 1,570
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Do not pay much attention to the Horse Power, its pretty meaningless these days as far as electric motors go. Pay attention to the GPM at the height you will have to pump the water out. Measure from the pump off point to the highest point in your piping. Look on the chart that came with the pump for the GPM. Your pump is between 1/3 HP and 1/2 HP. A Zoeller M53-D 1/3 HP will move a lot more water than most 1/2 HP off the hardware store shelf, and will keep moving that water long after the others have died. Another thing you want to look at is GPM verse GPH, they are allowed a much larger "Margin" of error on the GPH pumps, than the GPM pumps.
Last edited by Aftrmidnite; Oct 1, 2005 at 08:57 AM.
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