Which is the better option for a home water pump? a submersible pump or floor based pump?
In case of pump failure, it's much easier to repair/replace a floor based pump plumbed with isolation valves and unions. I've replaced a few due to motor failures and flood damage. Arguably, the submersible pump wouldn't have suffered damage due to flooding. Another consideration is vertical pump height. A floor based pump has to draw a vacuum to induce water to flow up to the impeller. This limits the practical draw to between 25 and 30 ft. Much more than that height and the vacuum will exceed the vapor pressure of the the water, boiling it rather than pumping it. A special device can be used to boost the lift: an ejector is placed down the well. Water is pumped down to the ejector, which pulls additional water back up using the venturi effect. This method suffers from additional friction losses but has clear advantages. If you need to pump water up a well more than 20 feet vertical, you should consider a submersible pump, particularly if you are concerned about the possibility of the water table lowering.
last week i got a price on a above ground pump it pumps water up from 100 ft. it sure beats pulling 100ft of caseing every few years
