Shower
  • Pressure produces the squirt that forces the water through the tiny holes in the shower head.
  • Flow is the quantity of water that flows in a certain time.

Increasing the pressure will increase the flow (and vice versa) – but they’re not the same thing.

Kiwi homes have traditionally had low-pressure hot-water systems where the hot-water pressure was much lower than the cold. Low-pressure hot-water systems can sometimes lack enough pressure to give a decent shower – which means they’re often “dribbly” – but use less water.

Most new hot-water systems are mains pressure. So the hot and cold water are at approximately the same pressure. Mains-pressure showers can sometimes be "hard", causing stinging and using heaps of water.

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