A Constant Pressure System meets household water demand at a specified pressure. With homes served by conventional water well systems, water demand in the house is provided from the pressure tank. When the “cut-in” pressure is reached (typically 40 psi) the submersible pump turns on until the “cut-out” pressure is reached (typically 60 psi) which turns the submersible pump off. This causes a fluctuating pressure in the home, which increases the more faucets that are in use. Constant Pressure Systems change the speed of the motor on the submersible pump to keep the pressure constant when there are changes in the water demand throughout the home. A large storage tank (pressure tank) is no longer needed for the storing of additional water. A very small tank, 2 to 3 gallons of storage is needed as a buffer to prevent water hammer. For existing water well systems that need a pump replacement, ask us about the possibility of upgrading to a Constant Pressure System.
Is Constant Pressure right for my home?
In our opinion, a Constant Pressure System equates to volume. A standard water system with a submersible pump and pressure tank, generally delivers 10-12 gallons per minute into the home. A Constant Pressure System means that the submersible pump must deliver a capacity greater than your home use. This is generally greater than 15 gallons per minute. Anything less than 15 gallons per minute and the possibility is great that there will be a loss of pressure as the demand increases in the home. An example is someone taking a shower and a family member doing laundry at the same time. A Constant Pressure System has advantages if certain criteria are met. These criteria are that the well will produce the proper volume of water and that the water table is not too deep in the well. Since every well is different and the State Code requirements must be met with regards to well construction, it is our opinion that the decision to install a Constant Pressure System or a standard water system be left until the water well has been constructed. If doing an upgrade, a pumping test must be completed. In most situations, there are additional costs for a Constant Pressure System over a standard water system. Example; greater horsepower and capacity of the submersible pump, also larger diameter of the plumbing to carry the larger volume of the water, from the submersible pump into the home.
What are the advantages that I can expect from a Constant Pressure System?
- Use water whenever you want to and get the same pressure wherever you are in your home.
- Accommodate a wide range of flow demands-everyone using water at the same time, or just washing your hands.
- Save space with a very small pressure tank, which is mounted on the wall instead of the floor.
- Irrigation systems for landscape and lawns, work much better-spray patterns are constant. No more dry area’s because of pressure fluctuations.
- Water treatment systems work better, and are more efficient.
- Appliances work better-fill the washing machine faster means the wash gets done faster.
- Protect your submersible pump, both Pentair IntelliDrives and Franklin Electric MonoDrives are equipped with motor and pump protection features.