Panel heating
A method of heating involving the installation of the heating units (pipe coils) in the walls, floor or ceiling of the room.
Panel radiators
A heating unit placed on, or flush with, a flat wall surface and intended to function as a radiator.
Perforated panel
A panel that is usually fitted across the front of a cabinet to dissipate the heat and add to the unit's appearance.
Pilot light
A small gas flame, usually natural gas or liquefied petroleum gas, which is kept alight in order to serve as an ignition source for a more powerful gas burner.
Pipe joints
The connection point between two pipes, or a pipe and a component.
Pitched roof
A roof with two or more slopes at more than 10 degrees to the meeting point.
Porous
Surfaces that have tiny openings which allow liquid to be absorbed, or to pass through.
Pressure gauge
A gadget to tell the pressure of the water in the system pipe work.
Pressure vessel
A hot water storage container, usually at water mains pressure.
Primary heat exchanger
Main heat exchanger in a boiler, usually serves the radiator system.
Programmer
A mechanical, electrical, or combination device incorporating a timer that can be pre-set to enable a central heating system to turn on at desired times.
PTFE tape
Also called plumber's tape. A thin film cut to specified widths for use in sealing pipe threads.
Pump
A device used to circulate water around the central heating system. Apart from primary pumps, pumps are generally not needed, as gravity will allow the water to circulate.
Pump impeller
The part of a circulating pump that drives the water.
Pump outlet
The water port on the circulating pump that the water flows out from.
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