I have a 1/2" water main entry, and if I open water in 2-3 places in the house, the water pressure is very low.
How can I fix this?
Water – How to get acceptable water pressure when using two faucets on the 1/2″ water main
waterwater-pressure
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Best Answer
1/2" is a very small "main" - the only truly functional approach would be to upgrade it to a larger main.
If your multiple-water use scenarios are of short duration, you could get some benefit from placing a pressure tank (as used in well pump systems) in the house to provide a few gallons of buffering, but after a few gallons (variable with size of tank and variation in pressure) the stored water runs out and you are back to what the main can supply.