Direct heating
Approved Document G, Sanitation, hot water safety and water efficiency, 2015 edition with 2016 amendments, defines direct heating as: ‘…a method of heating in which the heat source is integral with the hot water vessel. Examples are an electrical immersion heater, or a gas burner with a flue arrangement that passes through the vessel so that the flue transfers heat to the stored water, or the circulation of water from a vessel situated near a burner with a flue arrangement so that the flue transfers heat to the circulating water.’
See also: Indirect heating.
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