4" Z-Vent Concentric TWH kit with mixing box

In most applications, kit contains the components needed all in one box to vent a 4" tankless water heater with 3" air intake port. Designed for horizontally vented heaters mounted to an outside wall. Condensation drain and Back-flow preventer included for cold climates.

4" Z-Vent wall hung water heater vent kit

In most applications, kit contains the components you need to vent a 4" tankless water heater. Designed for horizontally vented heaters mounted to an outside wall.

4" Z-Vent wall hung water heater vent kit with back-flow preventer

In most applications, kit contains the components you need all in one box to vent a 4" tankless water heater. Designed for horizontally vented heaters mounted to an outside wall. Back-flow preventer is included for cold climates.

3" Z-Vent wall hung water heater vent kit

In most applications, kit contains all the components you need in one box to vent a 3" tankless water heater. Designed for horizontally vented heaters mounted to an outside wall. Includes combustion air duct and intake hood. Ideal for use with Bosch 250FX and 635ES tankless water heaters.