Lid for heat cell in water heater, has channel for carrying air to burner unit arranged within heat transfer medium coil in housing

摘要

The lid closes the top of a housing (3) in which a coil of pipe (4) is arranged for a heat transfer fluid, with a burner unit (5) arranged within the coil. A channel (22) is provided in the lid for carrying air to the burner unit. The channel is preferably tubular, extending in a spiral inwards or outwards.