Constant Pressure Well Systems
Consistent Water Pressure — No More Fluctuations
Variable frequency drive (VFD) well systems deliver steady water pressure throughout your home — no more pressure drops when multiple showers run, the dishwasher is going, and the irrigation kicks on. Installed by Deep Dive Plumbing Maryland, Licensed Master Plumber #98433.
How Constant Pressure Systems Work
A traditional well system uses a fixed-speed pump that turns on at 40 PSI and off at 60 PSI. Every time the pump cycles, you feel the pressure drop and surge. When multiple fixtures run simultaneously — morning showers, the dishwasher, the washing machine — the pressure drops noticeably.
A constant pressure system uses a variable frequency drive (VFD) controller to vary the speed of the pump motor in real time. When demand is low, the pump runs slowly. When demand is high, the pump speeds up. The result is a steady, consistent pressure — typically 60 PSI — regardless of how many fixtures are running.
The VFD also uses soft-start technology that gradually ramps the pump motor up to speed instead of starting at full power. This dramatically reduces electrical stress on the motor and extends pump life — especially important for deep wells where pump replacement is expensive.
Benefits of a Constant Pressure System
Recent Job — Huntingtown, MD
In Huntingtown, we upgraded a family's traditional pressure tank system to a constant pressure system. They had been dealing with pressure drops every time multiple fixtures ran simultaneously — morning showers were a daily frustration, and the irrigation system made it worse.
We installed a Franklin Electric SubDrive VFD controller on their existing pump (which was in good condition), replaced the large pressure tank with a small 4-gallon tank, and set the system to maintain 60 PSI. The difference was night and day — consistent pressure throughout the home regardless of demand.
The homeowner also noticed the pump running more quietly and less frequently — the variable speed operation is much gentler on the motor than the constant start/stop of a traditional system.
Constant Pressure System FAQs
What is a constant pressure well system?
A constant pressure system uses a variable frequency drive (VFD) controller to vary the speed of the well pump motor based on water demand. Instead of the pump running at full speed until pressure builds up and then shutting off, the pump runs continuously at whatever speed is needed to maintain a set pressure — typically 60 PSI. The result is consistent water pressure throughout the home regardless of how many fixtures are running.
How is a constant pressure system different from a traditional pressure tank system?
A traditional pressure tank system uses a fixed-speed pump that turns on when pressure drops to a low setpoint (typically 40 PSI) and turns off when pressure reaches a high setpoint (typically 60 PSI). This creates pressure fluctuations — you feel the pressure drop when the pump is off and surge when it turns on. A constant pressure system eliminates this by running the pump continuously at variable speed to maintain a steady 60 PSI.
What brands of constant pressure systems do you install?
We install Grundfos SQFlex, Franklin Electric SubDrive, and Pentair Intellidrive constant pressure systems. We select the system based on your well depth, pump size, and household demand. All systems we install are backed by our 18-month parts and labor warranty.
Will a constant pressure system work with my existing well pump?
In many cases, yes — a VFD controller can be added to an existing submersible pump if the pump is in good condition and compatible with variable frequency operation. However, if your pump is older or showing signs of wear, we typically recommend replacing the pump at the same time to get the full benefit of the new system.
How much does a constant pressure system cost?
Constant pressure systems typically cost more than a standard pressure tank replacement but less than you might expect given the performance improvement. The exact cost depends on whether we're adding a VFD controller to an existing pump or doing a full pump and controller installation. We provide free estimates — call (443) 440-0632.
How long does installation take?
A constant pressure system installation typically takes 4–6 hours for a controller-only upgrade or a full day for a pump and controller replacement. We restore water service the same day in virtually all cases.
Is a constant pressure system right for my home?
Constant pressure systems are ideal for homes with multiple bathrooms, irrigation systems, pressure complaints, or high peak demand. They're also a good choice for homes with low-yield wells, because the variable speed operation is gentler on the well than a fixed-speed pump cycling on and off. If you're experiencing pressure drops or have a growing household, a constant pressure system is worth considering.
Does a constant pressure system require a pressure tank?
Yes, but a much smaller one. Traditional pressure tank systems require a large tank (40–80 gallons) to provide adequate drawdown between pump cycles. A constant pressure system only needs a small tank (2–4 gallons) to absorb pressure spikes and protect the pump from very short cycles.
Can a constant pressure system help with a low-yield well?
Yes — the variable speed operation of a constant pressure system is gentler on low-yield wells than a fixed-speed pump. The pump can run at a lower speed that matches the well's recovery rate, reducing the risk of running the well dry. For very low-yield wells, we may also recommend a storage tank system in combination with a constant pressure setup.
What maintenance does a constant pressure system require?
Constant pressure systems require minimal maintenance. The VFD controller should be inspected annually, and the small pressure tank should be checked for proper pre-charge pressure. The well pump itself should be evaluated every 5–7 years. We offer annual well system inspections as part of our Priority Club membership.
Well Water Learning Center
Guides written by our team for Southern Maryland well water homeowners.
Related Well Water Services
Constant pressure systems work best when the full well system is in good shape. These services are commonly paired together.
Well Pump Repair & Replacement
A constant pressure system requires a compatible pump. We evaluate and replace the pump if needed.
Well Pressure Tanks
Constant pressure systems use a smaller tank. We size and install the right tank for your new system.
Pump Saver Protection
Add dry-run protection to your new constant pressure system — especially important for low-yield wells.
Ready for Consistent Water Pressure?
Call Deep Dive Plumbing Maryland for a free constant pressure system evaluation. We serve all of Calvert, Anne Arundel, and Charles County.