The 5-inch length on this specific model is required for tanks with thicker insulation or deeper tapping ports

or a diagnostic LED flashing a specific code

and SV9501 series

The P70 series typically utilizes SPST or SPDT switching for pilot duty or smaller loads

the 1147472 orifice is sized specifically for liquid propane (LP)

Lochinvar & A.O. Smith 100167807 Board 318423-701 The 5-inch length on thisThe 100167807 Integrated Control Board functions as the primary logic controller for specific A. O. Smith and Lochinvar high efficiency water heating systems. Engineered to manage critical functions including ignition sequencing, temperature regulation, and safety safety monitoring, this OEM replacement board ensures precise modulation and peak thermal efficiency. It replaces legacy part numbers 100167808 and 9008272005. Designed for the rigorous