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A rectangle marked as the heat source of a system.
Also known as: Heating boiler symbol, Heat source plan symbol
On a building services plan a boiler is drawn as a rectangle, often with a flame or burner mark, representing the appliance that heats water for the system.
Denotes the appliance heating water for a heating or hot water system.
Contexts: Technical drawing
Is drawn with separate flow and return connections, since a wet heating system is a circuit rather than a supply.
Contexts: Technical drawing
A rectangle with flow and return lines leaving it, marked with a small flame or burner symbol.
A fuller structured visual breakdown is not yet documented for this symbol.