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Do I need a positive or negative head shower pump?
The bathroom on the bottom level needs a positive head pump as the water has more than 600mm to travel between the water tank and the shower head. If the shower is less than 600mm below the cold water tank, then you need a negative head shower pump.
What’s the difference between positive and negative head shower pumps?
A positive head pump is designed to be fed by gravity. The gravity feed serves to kick-start the pump, which then pushes water to the shower. Negative Head Pumps. A negative head pump is used where the pump will be situated either level with or above the cold water tank.
What is the difference between 1.5 bar and 2 bar shower pump?
1.5 bar shower pumps – A 1.5 bar shower pump is best suited to normal showers needing more pressure. 2 bar shower pumps – A 2 bar shower pump is also best for low pressure showers. Some showers have body jets and also require higher rates of water pressure which can be handled by 3 bar shower pumps and larger sizes.
Why does my shower pump stop and start?
The majority of pumps have dry run protection, which cuts in to protect them from damage if the water supply is interrupted. If this protection kicks in, the pump will stop. You need to turn off the mains power to the pump for a few seconds to reset the pump (there will usually be an isolator switch or fused spur).
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.
Can pump head be negative?
Distance of the liquid source above or below the pump inlet, measured in feet: can be positive OR negative. Positive suction head occurs when the top of the water source is above the suction Inlet of the pump. Negative elevation refers to suction lift (like from a pond, tank lower than the pump, etc.)
What is positive and negative water pressure?
Properly applied positive side waterproofing protects the interior of the facility from moisture infiltration and protects the structural components, including concrete and steel. Negative side waterproofing prevents water from entering occupied space. However, it does not prevent water from entering the substrate.
Why do we need a positive shower pump?
This is called a positive head system because the cold water tank is positioned 600mm higher than the shower, so water flows downwards via gravity. Key learning: A positive pump needs a flow rate of at least 0.6 litres a minute and relies on gravity to start the impellers to pump hot and cold water. Back to top.
How big does a positive head shower pump need to be?
Positive head shower pump. This type of pump needs a minimum head of at least 3ft 3ins (990mm) between the base of the cistern and the shower head. This is because it relies on a gravity feed of water to kick start the impellers and start pumping hot and cold water. This type of shower pump ‘pushes’ the feed of water to the shower.
How does a positive head shower system work?
This system normally features a cold water tank in the loft and a hot water cylinder tank in an airing cupboard. This is called a positive head system because the cold water tank is positioned 600mm higher than the shower, so water flows downwards via gravity.
What’s the difference between positive and negative head pumps?
What is the difference between positive and negative head? Gravity fed systems can be either positive head or negative head, depending on the location of your cold water storage tank, pipework and outlets. A positive head pump will work in a positive head system and a universal pump will work in either.