OEM replacement 12V DC module board that controls ignition and system functions on the Suburban IW60 (Nautilus/Advantage) on-demand water heater, excluding blower control.
The Suburban Mfg 521135 is an OEM replacement module board designed specifically for the Suburban IW60 on-demand (tankless) water heater, also sold under the Nautilus and Advantage series naming. This 12V DC board manages ignition and system functions for the unit, restoring dependable ignition performance and consistent hot water operation when the original board fails.
This board controls ignition and all IW60 functions except the blower. Blower control is handled by a separate board, part #521136. If the blower isn't functioning correctly, that separate board may be the part needed instead.
• (1) Suburban Mfg 521135 ignition control module board