http://tinyurl.com/k6k3mgh<P>Bosch AQ4 Water Heater Vent KitProduct Review<P> Click on the link for more reviews<P>Accessory: Power vent with built-in freeze protection<P>Optional Accessory: Power Vent kit for Bosch AquaStar Models 1600P and 1600H when venting horizontally.<P>Requires electricity.<P>
