How wet­backs work

Matamata Chronicle - - Winter Warmth -

Heat from the com­bus­tion process is used to heat wa­ter jack­ets in­stalled within the fire­box.

Wa­ter is cir­cu­lated through the wa­ter jack­ets and then through pipes to the stor­age heater.

Older wet­backs may sim­ply con­sist of pipes which pass through the fire­box of a wood burner, wood stove or, in some cases, through older style open fires.

Most wet­backs cir­cu­late the wa­ter through a ther­mosiphon ef­fect (i.e. warmer wa­ter rises and cooler wa­ter falls, cre­at­ing a nat­u­ral flow through the wa­ter jacket within the solid fuel burner).

As a con­se­quence, the hot wa­ter cylin­der should be

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