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How to plan pipe sizes for optimal water pressure in the home plumbing

When building a house you must design the house for the proper water pressure. The optimal water pressure for a house should be 35 to 60 pounds per square inch. If your city supplies water at low pressure, the size of the plumbing pipes should be optimized to obtain the maximum water pressure. The size of the pipes used will vary depending on the location of the water facilities.


  1. Select a copper tube of at least 3/4 inch for the water supply. This will ensure that you receive optimal water pressure. If the water is in the low pressure stand consider the establishment of a 1-inch copper tube. To check the water supply pressure, ask the water supply company for a reading of the water supply pressure.
  2. Use 1/2 inch copper tubing for the bathroom. Use this size for all encounters in the bathroom. This includes the toilet, sink, bathtub, shower and any other accessory installed.
  3. Installation of copper pipes 3/4 inches for the kitchen sink and other kitchen accessories.
  4. Use 3/4-inch copper tubing for the water heater and any water reservoir you may have. It is important that you do not use a smaller tube for the water heater, which would lower the pressure for hot water throughout the house if a smaller size is used.
  5. Use 1/2-inch copper tubing for all other appliances that will be added to your home. This can include washing machines, water hoses and extra outside drains in the house.

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