The Bosch ESHCK SS Concentric Vent Kit, part number ESHCK, is a stainless steel concentric venting solution designed to combine the exhaust outlet and combustion air intake into a single sidewall penetration for compatible Bosch Therm series tankless gas water heaters. The kit accommodates a 3-inch inner exhaust pathway within a 5-inch outer wall penetration, consolidating both venting functions through one exterior wall opening. It provides a clean, code-compliant sidewall venting configuration that reduces the number of exterior wall penetrations required during installation.
The concentric design routes exhaust gases outward through the inner 3-inch pipe while drawing combustion air inward through the annular space between the inner and outer pipe walls, allowing both functions to share a single 5-inch wall sleeve. This kit is intended for installations where the water heater is mounted on a wall perpendicular to the exterior wall through which the venting will pass. The ESHCK kit does not include the additional 3-inch vent pipe, termination tee, and 90-degree elbow required to complete the full installation run; these components must be sourced separately or as part of the full kit configuration.
What's Included: Stainless steel concentric vent kit assembly with 3-inch inner exhaust pathway and 5-inch outer wall penetration sleeve for sidewall installation.
Installation Limits: The heater must be installed on a wall perpendicular to the exterior venting wall due to the kit's fixed length and geometry. This kit requires the addition of a 3-inch CAT III stainless steel vent pipe of no less than 3 feet in length, a 3-inch termination tee, and a 90-degree elbow to complete the installation. These additional components are not included with the ESHCK kit alone.
Compatibility: Compatible with Bosch Therm 940ES, Bosch Therm 830ES, GWH 715ES, Evolution 500, Bosch AquaStar 2700ES, and Bosch AquaStar 2400ES tankless gas water heaters.
