CMK and CRK Configurations

*Will have an empty slot in the manifold. These installations will require that the water/gas/condensate piping to be capped.

**If the 2 unit system is in conjunction with a storage tank, a SC-401-6M is needed. However if it is just a straight tankless system then you can use a QC-2 instead of a SC-401-6M.


All systems over 4 units require remote cord (RC-CORD10 or RC-CORD26). Longer Remote Cords are needed depending on which unit they install the system controller in.

Header Sizing

Up to 24 individual water heaters can be easily connected using multiples of CRK-BASE and CRK-ADDON kits. In order to ensure proper operation, a system controller (SC401-6M, SCU-401-12M or SCU-401-24M, sold separately) is required to ensure system balancing and load management. Manifold sizing is designed for a maximum of eight (8) water heaters. In order to connect units in greater number than eight, a common header of a larger diameter may be necessary. Refer to local plumbing and/or building code for minimum piping requirements.

Number of Units	Minimum Common Gas Header	Minimum Common Water Header	Minimum Common Condensate Header
Up to 8 Units	2 Inches	2 Inches	0.75 Inches
Greater than 8 units; Less than or equal to 16 Units	2.5 Inches	2.5 Inches	1 Inch
Greater than 16 units; Less than or equal to 24 Units	3 Inches	3 Inches	1.25 Inches

These lists are meant as a guide as other configurations are possible. To get a consulatation with our commercial team, visit NORITZ.COM/COMMERCIAL-CONSULTATION