http://www.pleasingplumbing.co.uk/index_files/Page344.htm
THE XENEX GAS SAVER. This can be seen at www.zenexenergy.com. This recuperates the heat that would have been lost through the flue gases to preheat the hot water going through a combi boiler. Gas savings of around 40% have been reported in field trials. More information at (www.zenexenergy.com/docs/gassaver.htm)
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