Variable Frequency Drive or VFD Well Pump Systems are fast becoming the "GO TO" technology in well pump system upgrades. Unlike conventional well pump systems that typically operate on a 20 psi differential pressure range, VFD systems speed up or slow down according to the amount of water being called for use. The major advantages VFD systems offer are; better water pressure...& the ability to deliver water at better pressure to multiple points of use simultaneously.
When marketing a home that has a VFD well pump system, it is a feature that should be highlighted in the listing. The presence of such a system allows for many other upgrades in the home to become a reality. Examples of this would be expanding the size of the existing home & adding a bath or multiple bathrooms, a body shower, an irrigation system, etc. Homeowners that have conventional well pump systems & attempt some of these upgrades oftentimes run into problems with water pressure or flow issues.
VFD well pump systems also employ soft start technology which is easier on the homes plumbing system because it eliminates jarring or banging of the pipes. Most VFD systems also include built in run dry, & under / over voltage protection; features that are considered "add ons" for a conventional system.
Another attractive feature is that VFD well pump systems take up less room than a conventional system. This is because the VFD system does not rely on a large pressure tank to create a reservoir from which the water is drawn. Rather; a small basket ball sized inline tank is installed to prevent the pump from activating when just a cup of water is drawn. Otherwise, the pump will activate & deliver what it needs to.
If considering purchasing a home that has a well with questionable recovery ability, a static storage tank can be installed in conjunction with the VFD to allow the VFD system a ready available reservoir of water to draw from. Point is; a weak well should not discourage a buyer from submitting an offer on a home they otherwise love unless all options such as static storage or hydrofracture have been explored. There are also VFD booster systems available that don't require pulling & replacing the existing well pump; rather they are added in line after the tank & any existing water treatment system (or sometimes before) that may exist in the basement