Water heating apparatus, especially for pools

摘要

A water heater (10) for heating water, including a burner assembly (54) for generating a flow of hot gas; a heat exchanger assembly (20) arranged to receive said flow of hot gas for transferring heat from the gas to water flowing therein; ducting (22,23) to 5 conduct said water to and from said heat exchanger assembly (20); means (80) to collect condensate produced from condensation of said gas in said heat exchanger assembly; and a condensate duct (84) to direct said condensate into said water for chemically treating said water. A method of chemically treating water in a pool is described comprising adding to the water condensate collected from a heat exchanger 0 assembly (20) of a water heater (10) through which the pool water is circulated and heated.