The entire time I had been thinking the pump had to be sized based on the depth of the pump instead of pumping water level PLUS pipe friction loss. Then a little 3/4 or 1HP jet pump or submersible in the cistern with a PK1A kit would give you more water than you could use with every faucet open. You could set a 5 GPM, 1HP at 600' on 1" steel pipe, #10 wire, and have plenty of water to fill the cistern. If the well is a weak producer or slow to recover, you might consider a cistern system with a booster pump. If the well will recover pretty fast, I think I would go with the 10 GPM, 2HP Goulds on 1 1/4" steel pipe, a CSV1A, #8 wire, and about a 20 gallon size pressure tank. But both the 10GPM, 2HP and the 16 GPM, 3HP Grundfos builds more pressure than the CSV1A can handle.Ī lot of this is dependent on how fast your well will recover. The 10 GPM, 2HP Grundfos won't really pump any more water than the 10 GPM, 2HP Goulds. The 16 GPM, 3HP will only let you utilize the water down to 580' with pressure, and then only at 4 GPM.
#8 wire is good for a 2HP up to 620' total, and the CSV1A will work with either the 7 GPM, 1.5HP or the 10 GPM, 2HP Goulds.
They won't deliver pressure if the water level gets deeper than 520' anyway. I really don't see any reason to set the 7 GPM, 1.5HP or the 10 GPM, 2HP Goulds any deeper than about 520'. A 10 GPM, 2HP Goulds can deliver 8 GPM at 50 PSI from about 480' deep. A 7 GPM, 1.5HP can only deliver 8 GPM at 50 PSI from a depth of about 350'. With 3 showers at at times you will need 8-9 GPM minimum. I could go with a 2HP pump but both need 6-3 wire so I figured a 3HP would be better in the long run. I’m thinking a 10GPM or 16GPM pump with a 3HP motor, 1.25” drop pipe and a CSV is a better fit for my situation. Shower heads will be normal GPM rates but there will be times when 2-3 showers will be running at the same time.ĥGPM seems way undersized for my application. There will be no irrigation or sprinkler usage.
#Well pump wire size chart full
The house is 5 full bathrooms (although 1 bathroom is a guest bath and will only have occasional use) and we are a family of 5 with two adults and 3 young kids that take regular baths. The house is about 120’ from the well head and about the same height as the well head. The well is 650’ deep, static level 176’, produces 3GPM and pump will be set at 620’. My concern is that both are not enough GPMs for peak demand. I got two estimates one called for a 1.5HP 5GPM pump and the other called for 1.5HP 7GPM pump. Would like to get a second opinion for well pump sizing for a new well.
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