Constant Pressure Well Pump: Is It Worth It in SC?

A constant pressure well pump uses a variable-speed controller to speed the pump up or slow it down as you use water. The goal is steady pressure, even with a shower and the washer running at once. It's a good fit for bigger households and homes with pressure that swings. It isn't always the right buy, though. Austin Drilling has sized pumps for South Carolina wells since 1960, and we'll tell you honestly which camp your house falls in.

How does a constant pressure well pump work?

A standard pump has one speed. It runs full blast until the tank fills, then shuts off. When pressure drops, it kicks back on. That's why your shower can go strong, then weak, then strong again.

A constant pressure system adds a controller between your power and the pump. It reads the pressure all the time. Open one faucet and the pump turns slow. Open three and it spins faster. Pressure stays close to the same number the whole time.

What are the real benefits?

The biggest one is the end of rapid on-off cycling. Every hard start heats and wears the motor. Running at lower speeds also means less wear on the pump itself (oakvillepump.com).

You also need only a small tank, not a big one in the garage. These controllers usually include dry-well protection that shuts the pump down before it burns up. And the drive cleans up the power it feeds the motor. That helps on rural lines where the power isn't great.

What are the downsides nobody mentions?

The controller is the weak spot. Is it reliable? Mostly, but when it fails, replacing it costs far more than swapping a standard pressure switch. It also has to be set up right. A poor install can kill the motor early (oakvillepump.com).

Will it save on your power bill? Don't count on any savings there. The same source found no real change in energy use.

Then there's the storm problem here in South Carolina. A small tank stores very little water. When summer storms knock the power out, a big standard tank still gives you some water for flushing and washing hands. A constant pressure setup gives you almost nothing until the lights come back.

Is a constant pressure well pump right for your home?

Austin Drilling usually points a homeowner toward a constant pressure well pump when a few things line up. You have a big family or a lot of fixtures running at once. Your pressure swings even though the pump and tank check out. You want a smaller tank footprint.

We steer people the other way when outages are common on their road. We also steer them away when the real problem is something else. Swinging pressure is often a waterlogged tank or a bad switch, and a new pump won't fix that. Our page on well water pressure that fluctuates walks through those causes first.

How do we decide what goes down your well?

We start with the well itself, including the depth, the yield, and how much water your house actually uses. One customer asked about a pump, tank and "all other odds and ends" for a 400-foot well. That's exactly the kind of job where sizing matters more than the label on the box. Our guide to what size well pump you need explains how that math works.

We work with several quality brands and pick the pump that fits your well, not the one with the biggest margin. Every pump and tank we install carries a five-year manufacturer's warranty, plus our first-year service guarantee. See our pump services for the full details.

FAQ

What is a constant pressure well pump?

It's a submersible pump paired with a variable-speed controller. The controller changes pump speed so your pressure stays steady. Our guide to well pump types compares it with standard pumps.

Is a constant pressure well pump better than a standard pump?

It gives smoother pressure and less cycling. A standard pump with a well-sized tank is simpler, and it holds more water during an outage.

Does a constant pressure system still need a pressure tank?

Yes, though it's a much smaller tank. It buffers the system between pump starts.

What if my pump runs after a storm but gives no water?

Shut it off at the breaker so it doesn't run dry. Then read what to check when your well pump is not working.

Who installs constant pressure systems near Columbia?

Call Austin Drilling and we'll get your water right. West Columbia is (803) 926-5402 and Newberry is (803) 926-7080, Monday through Friday, 7am to 6pm, and Saturdays by appointment.