Jargon Buster

Single Phase Single-phase electricity is what you have in your house. You generally talk about household electrical service as single-phase, 230-volt AC service.
Three Phase Three-phase electric power is common in a lot of industrial buildings as it is used to power large motors and other heavy loads. It is a common method of alternating-current electric power generation, transmission and distribution.
Negative Head A negative head system exists when there is insufficient pressure or head of water under gravity to provide a flow / pressure at the outlet. Typically a negative head condition exists where the flow from the outlet is less than 1 litre/min.
Positive Head A positive head system exists when sufficient pressure is available under gravity to provide a flow at the outlet. Typically a positive head condition exists where the flow from the outlet is more than 1 litre/min.
Flow Rate The amount of fluid that flows in a given time
Pressures Pumps are rated in ‘bar’ which is the measure of pressure, 1 bar pressure being equal to 10 metres static head of water.
Automatic Flow Switch Designed to provide a constant water supply from a break tank, these units rely on gravity flow to activate. Features include fully automatic control with dry run protection.
Header Tank A raised tank of water maintaining pressure in a plumbing system.
Break Tank Break tanks are implemented in boosting systems in order to supply the system if the mains supply becomes insufficient.
Pressure Vessel A pressure vessel is a closed container designed to hold gases or liquids at a pressure substantially different from the ambient pressure.
Expansion Vessel An expansion tank or expansion vessel is a small tank used to protect closed (not open to atmospheric pressure) water heating systems and domestic hot water systems from excessive pressure. The tank is partially filled with air, whose compressibility cushions shock caused by water hammer and absorbs excess water pressure caused by thermal expansion.
Potable drinking quality water. Potable vessel will mean suitable for storing drinking quality water.
Centrifugal moving or directed outward from the centre. A pump that uses an impeller with backward-swept arms to push water or other fluids outwards from the centre of the axis. The efficiency tends to increase with flow rate up to a point midway through the operating range (peak efficiency) and then declines as flow rates rise further.
Peripheral the outside area of something, or around the outside. A pump that uses an impeller with teeth around the outside to move water around. Also known as regenerative or regenerative turbine pump. These are low capacity high head pumps.
Impeller the vaned rotating disc in a pump or compressor. The rotating part of a centrifugal pump, compressor, or other machine designed to move a fluid by rotation.
Single Pumps Single pumps are designed to boost single water supplies; hot, cold or pre-mixed.
Twin Pumps A twin pump is usually one product with two pumps inside. Twin pumps are designed to boost both hot and cold water supplies equally.
Sump A hollow (hole) or depression in which liquid collects. Commonly a hole in the ground (a sump hole).
Check Valve a non-return valve that allows the flow of liquid through one way. Once the flow has stopped the valve shuts to stop any liquid back-flowing.
Pump Controller Automates the operation of a pump and protects against dry running.
Pump Switch Automates the operation of a pump.
Dry Running When the pump is running but there is no fluid going through it – this causes irreversible damage to the pump
Combi Boiler A combi boiler is both a high-efficiency water heater and a central heating boiler, combined (hence the name) within one compact unit. Therefore, no separate hot water cylinder is required, offering space saving within the property.


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