Bosch 7709003913 Therm Outdoor Vent Kit (Gray) - BTOK (7709003913)

Bosch Therm Outdoor Vent Kit (Gray) - BTOK (7709003913)The Bosch Therm Outdoor Vent Kit (Gray) - BTOK (7709003913) fits on to the top of the Bosch Therm tankless water heater to allow the water heater to be installed outdoors in areas that only experience occasional overnight freezes.The BTOK Outdoor Vent Kit is designed to work with the following Gray Bosch Tankless Water Heaters: Bosch ProTL 199C, Bosch ProTL 175C, Bosch ProTL 199, and Bosch ProTL 175. The BTOK Outdoor Vent Kit does not come with built-in Freeze Protection as these heaters come equipped with Freeze Protection.