T-K4 - 190,000 BTU Natural Gas Outdoor Non-Condensing

The 9007674005 Recess Box completely houses the tankless hot water unit and allows it to be completely recessed into a wall for a smooth, almost seamless look. It is just over 14 inches wide so it easily fits in-between the studs.

For Use with the following models:

T-KJr2-OS, T-KJr2U-OS, T-K4-OS, T-K4U-OS, T-D2-OS, T-D2U-OS

The 9007670005 Pipe Cover protects the plumbing pipes to the water heater from unexpected adjustments. This pipe cover is fixed to the bottom of the water heater, which hides the plumbing and improves the visual aspects of the whole installation for the water heater.

For Use with the following models:

T-KJr2U-IN, T-KJr2U-OS, T-K4-IN, T-K4-OS, T-K4U-IN, T-K4U-OS, T-D2-IN, T-D2-OS, T-D2U-IN, T-D2U-OS

The 9007666005 Remote Temperature Controller (TK-RE02) allows the output temperature to be adjusted beyond the factory settings, and works as a diagnostic tool for error codes.
(Not compatible with the Ultra-Low NOx models)

For Use with the following models:

T-KJr2-IN, T-KJr2-OS,  T-K4-IN, T-K4-OS

The 9007604005 Lead Free Isolation Valves & Pressure Relief Valves are used to isolate a unit for service. The Pressure Relief Valve is to help protect the unit and release if the pressure in the tankless water heater or hot water system exceeds 150 psi and up to 200,000 BTUs. For 3/4" water lines. (1953 Compliant)

For Use with the following models:

TK-110C-NI, TK-310C-NI, TK-510C-NI, T-KJr2/U, T-K4/U, T-D2/U, T-H3M, T-H3J, T-H3S, T-H3