Constant Pressure Well Systems in Southern Maryland | Deep Dive Plumbing Maryland
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 well system uses a variable frequency drive (VFD) controller to vary the pump motor speed based on demand. Traditional well systems cycle on and off between two pressure setpoints (typically 40/60 PSI). A constant pressure system maintains a steady pressure (typically 60 PSI) by continuously adjusting pump speed. The result is consistent water pressure throughout the home regardless of how many fixtures are running simultaneously.
How is a constant pressure system different from a standard well system?
A standard well system uses a fixed-speed pump that cycles on and off, causing pressure to fluctuate between the cut-in and cut-out pressure settings. A constant pressure system uses a VFD controller to run the pump at variable speeds, maintaining steady pressure. Constant pressure systems also reduce pump wear by eliminating the mechanical stress of frequent starts and stops.
What brands of constant pressure systems do you install?
We install Grundfos SQFlex and CM series, Franklin Electric SubDrive, Goulds Water Technology, and Pentek Intellidrive systems. We recommend the system based on your well depth, pump size, household demand, and budget. We stock parts for the systems we install to support warranty service.
How much does a constant pressure system cost in Maryland?
Constant pressure system installation cost depends on the controller model, whether the existing pump is compatible, and the complexity of the installation. We provide a written estimate after evaluating your existing system.
Can a constant pressure system be added to my existing well pump?
In many cases, yes — a VFD controller can be added to a compatible existing submersible pump without replacing the pump. The pump must be rated for variable speed operation and in good condition. We evaluate your existing pump before recommending whether to add a controller or replace the pump and controller together.
Will a constant pressure system improve my shower pressure?
Yes — if your current system has pressure fluctuations (pressure drops when multiple fixtures run), a constant pressure system will eliminate those fluctuations. You will notice the most improvement when running multiple showers, the dishwasher, and irrigation simultaneously. If your pressure is consistently low (not just fluctuating), the cause may be a different issue — pump sizing, well yield, or pipe restrictions.
How long does a constant pressure system installation take?
A constant pressure controller installation on an existing compatible pump typically takes 2–4 hours. If the pump also needs to be replaced, add 3–5 hours for the pump pull and reinstallation. We typically complete the full installation in one visit.
Does a constant pressure system require more maintenance than a standard system?
No — constant pressure systems require the same annual maintenance as standard well systems: pressure tank inspection, water quality testing, and pump performance check. The VFD controller is solid-state with no moving parts and is very reliable. We include a system check with our annual well maintenance service.
What size pressure tank do I need with a constant pressure system?
Constant pressure systems require a smaller pressure tank than traditional systems because the pump runs continuously rather than cycling. A 2–4 gallon tank is typically sufficient for a constant pressure system, compared to 20–80 gallons for a traditional system. We size the tank correctly for your system during installation.
Can a constant pressure system help with a low-yield well?
A constant pressure system alone does not solve a low-yield well problem — it addresses pressure fluctuations, not water supply limitations. For low-yield wells, we combine a constant pressure system with a storage tank and booster pump, or a cycle stop valve, to manage the limited yield. We assess your well yield before recommending the right solution.
Is a constant pressure system worth it?
For homes with pressure fluctuation problems — especially homes with multiple bathrooms, irrigation systems, or high simultaneous demand — a constant pressure system is typically worth the investment. It eliminates the most common well water complaint (pressure drops during showers) and extends pump life by reducing start/stop cycling. For homes with consistent pressure and no fluctuation issues, the benefit is less significant.
Do you warranty constant pressure system installations?
Yes — Deep Dive Plumbing Maryland backs constant pressure system installations with an 18-month labor warranty. Manufacturer warranties on the controller and pump components are passed through to you. We provide all warranty documentation at the time of installation.
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 and Anne Arundel County.
What Our Customers Are Saying
Real reviews from real Southern Maryland homeowners.
Savannah Foster
Southern Maryland
May 2026
"Absolutely blown away by the service from Deep Dive Plumbing Maryland! We had ongoing issues with our well water for years — bad smell, staining, and constant problems with pressure — and nobody ever took the time to truly figure out the root cause. Terry and the team came out, performed a full water analysis, explained everything in detail, and designed a system specifically for our home instead of just trying to sell us random equipment. You can really tell they care about doing things the right way. The install was extremely clean and professional, they walked us through how everything works, and our water has never looked or tasted better. The difference is unbelievable."
George Baker III
Annapolis, MD
May 2026
"We recently had Deep Dive Plumbing Maryland out to our home in Annapolis after we suddenly started noticing sewer flies throughout the house. They truly lived up to their name and performed a full "deep dive" diagnostic inspection instead of just treating the symptom. During their inspection they discovered our sewer pipe connected to the toilet had been leaking into the basement for quite some time. The team explained everything clearly, provided upfront pricing before starting any work, and even gave us a military discount which was greatly appreciated. They were professional, respectful, extremely knowledgeable, and took the time to make sure the repair was done correctly."
Jess
Local Guide
Southern Maryland
May 2026
"We had a mystery leak in our bathroom and everyone who saw it was convinced it was coming from inside the wall. He came out, checked everything, and was super thorough instead of just guessing. Turns out it was actually a leak from the toilet tank that was dripping in a way that made it look like it was coming from the opposite wall. He was super patient with all of our questions and explained the fix. We really appreciated his professionalism and transparency. Having an older home, it can be stressful not knowing what kind of repair you're walking into. I highly recommend him if you want someone trustworthy and knowledgeable who genuinely just wants to help."