What's the difference between positive and negative head shower pumps?
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Simply so, do I need a positive or negative head shower pump?
If the shower is more than 600mm, about two rulers, below the cold water tank, then you need a positive head shower pump. If the shower is less than 600mm below the cold water tank, then you need a negative head shower pump.
Furthermore, what does negative head mean? Negative head is a condition of negative pressure or vacuum which occurs when the pump outlet is at the same level or above the level of the cold water storage tank.
Also to know is, what does negative head shower pump mean?
The term 'negative head' means the cold water tank outlet is below or near-level with the shower head. Negative head pumps have a pressure switch to recognise when the shower is turned on even when water is not flowing.
What is positive and negative head plumbing?
A positive head system occurs when there is more than 600mm from the bottom of the cold water tank to highest point in the system. A negative head system occurs when the distance from the bottom of the cold water tank to the highest point in the system is less than 600mm.