Can you have too big of a well pressure tank?

Author: Tod Rodriguez  |  Last update: Wednesday, August 6, 2025

Is it okay to oversize a well pressure tank? Yes–it's virtually impossible for there to be a pressure tank that's too large.

Can I oversize my well pressure tank?

Can I oversize a well pressure tank? Oversizing a well pressure tank won't hurt your well system. Larger tanks result in longer and slower pump cycles and consequently fewer startups and longer runtimes, which means the tank may have better longevity.

Can an expansion tank be too big?

If the expansion tank you purchase is smaller than what your system requires, the excess pressure from the expanding hot water will cause relief valve discharge. On the other hand, there is no problem with having an expansion tank that is larger than what your system requires.

Does the size of a well pressure tank matter?

Choosing a Tank

A larger pressure tank often lasts longer due to having fewer pump cycles. They may, however, be less cost-effective and take up a larger space. A tank that is too small will wear out quickly as it cycles too fast. This also means you may have to replace the tank more often.

Will a bigger pressure tank increase water pressure?

No the pump provides the pressure the pressure tank stores it the larger the tank the more water it will store and the less the pump will cycle and the more even the pressure.

How to Size a Pressure Tank

What happens if your pressure tank is too high?

If there the air pressure is too high (Fig 4) the water has discharged completely at 30psi, before the pump starts at 20psi, causing a brief interruption in water flow and a sudden surge when the pump cuts in. The pump will also cycle more rapidly.

What size pressure tank do I need for a 3 bedroom house?

A: A rule of thumb method used by Water Worker and other sources is to add up all the water outlets inside and outside the house. Toilets, faucets, washer, showers, etc and then multiply by 3 for the gal capacity of the tank. Example 10 outlets times 3 = 30 gal. Round up so a 33 gal tank.

How many pounds of pressure should be in my well tank?

The ideal well water pressure is between 40-60 psi. If you're uncertain whether your water pressure falls within this range, learn how to test your water pressure. It's a good skill to learn. Checking your water pressure a few times a year can help you detect problems before they get worse.

What happens if a well pump is too big?

Oversized pumps generate excess system flow and with throttling cause higher backpressures, this will in turn prematurely wear out bearings and seals.

How long do well pressure tanks last?

Well pressure tanks typically last 10 to 15 years, depending on water quality, usage patterns, and maintenance. Over time, the tank's interior bladder (in bladder tanks) or diaphragm can wear out or develop leaks, leading to a loss of pressure and efficiency in the water system.

Can a tank be too big?

When it comes to the size of your fish tank, you want to make sure you choose something that isn't too big or too small. A good rule of thumb is to go with a one-gallon tank for every inch of fish. This will give your fish plenty of space to swim around and make it easier to care for them.

What is the rule of thumb for expansion tank sizes?

The general rule of thumb for proper capacity of expansion is 12% of total coolant volume for draw down and 6% of the total volume for thermal expansion.

Who makes the best well pressure tanks?

Well-X-Trol is the world's most trusted brand of well tanks, backed by an industry leading 7-year limited warranty.

Do I need an expansion tank if I have a well pressure tank?

Do I need an expansion tank if I have a pressure tank? Yes, since they provide a different function, an expansion tank is recommended if you have a closed-loop system with any check valve or pressure regulating valve installed on the water supply line.

Is it better to oversize or undersize a pump?

Oversizing a pump can come with some of its own issues, but it is generally a better idea than undersizing a pump. Ideally, you will want to find a pump where you aren't pushing the components to their max, and slightly over-sizing a pump safely accomplishes this.

Can a well pressure tank lose pressure?

Solution: Replace the well pressure tank

When this bladder ruptures, the water and air are no longer kept separate, and the pressure inside the tank drops.

How do I know if my pump is oversized?

there is another way to define that the pump is oversized. If the pump is oversized it will have pressure (head) less than the pressure within the operating range. Try to close the discharge valve and watch what happens.

How much does it cost to replace a well pressure tank?

Replacing a well pressure tank costs $500 on average, but it can cost between $300 and $700, depending on the tank's size, capacity, and labor costs for professional installation.

Does pressure tank size matter?

Why proper tank sizing matters. A well-sized pressure tank helps: Prevent short cycling: Reduces wear and tear on the pump by minimizing on/off cycles.

What psi should my pressure tank be at?

This differs depending on your tank's pressure settings. Most well tanks come set at 30/50. The cut-on pressure for the well pump is 30 psi, so the pressure of the tank should have a pressure of 28 psi. If your well tank is on a 40/60 pressure switch, your pressure setting should be 38 psi.

Can I add air to my pressure tank without draining it?

To ensure the longevity and efficiency of your well pressure tank, there are a few simple steps you should take when adding air. First, turn off the water supply to the tank to prevent any mishaps during the process. Then, drain any excess water out of the tank to create more space for the added air.

How big a water tank do I need for a family of 4?

Storage Volume

A small (50- to 60-gallon) storage tank is usually sufficient for one to two three people. A medium (80-gallon) storage tank works well for three to four people.

Can I replace my own well pressure tank?

Chances are it's time to replace your water well pressure tank. While this may sound like a job for a professional plumber, this is also something you can do yourself at home if you're handy with DIY plumbing.

How many gallons does a 3 bedroom house hold?

Most residential septic tanks range in size from 750 gallons to 1,250 gallons. An average 3-bedroom home, less than 2500 square feet, will probably require a 1000-gallon tank.

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