Suburban Nautilus IW60 & IW60RL Water Heater Parts and Control Guide

The Suburban Nautilus IW60 and IW60RL are different on-demand RV water-heater configurations. Both use a combustion-air and water-flow control system, but their ignition modules are numbered separately. The IW60RL also has a model-specific internal pump, tubing and temperature-probe kit. Check the heater nameplate before choosing a board, valve or water-side component.

Parts pictured in this guide

Select an image for product details, or jump to the parts list. Match the complete model and part number before ordering.

Suburban 161291 IW60 On-Demand RV Water Heater Wall Controller , White — Suburban Nautilus IW60 & IW60RL Water Heater Parts and Control GuideSuburban 161291 IW60 On-Demand RV Water Heater Wall Controller , WhitePart 161291
Suburban 161292 IW60 On-Demand RV Water Heater Wall Controller , Black — Suburban Nautilus IW60 & IW60RL Water Heater Parts and Control GuideSuburban 161292 IW60 On-Demand RV Water Heater Wall Controller , BlackPart 161292

Factory part numbers and model differences

Suburban part Service part or assembly Application / distinction
5581A IW60 complete on-demand water heater IW60 model
5280A IW60RL complete on-demand water heater IW60RL model
521135 Ignition control module IW60
521212 Ignition control module IW60RL
521299 Internal pump, tube and temperature-probe service kit IW60RL in current parts catalog
161248 Nautilus gas-control valve Verify installed valve configuration
233229 Combustion-air pressure switch Nautilus service component
233231 Overheat sensor Nautilus safety sensing component
233237 Water-flow sensor Nautilus flow detection
233245 Ignition electrode and flame-sensing probe Nautilus ignition service part
521136 Blower control module Separate from main ignition board
391127 Blower assembly Motor and blower system
161249 Two-stage regulator Separate from gas-control valve 161248
233307 Freeze-protection valve Verify heater generation and original valve
233253 Resettable limit switch Match exact heater version
161291 White wall control centre Verify wall interface and connector
161292 Black wall control centre Verify wall interface and connector

Which internal parts differ?

System position Part-identification rule
Main electronic module IW60 uses board 521135; IW60RL uses board 521212. A visually similar board isn't proof of compatibility.
Internal water-side pump Suburban's 2026 parts manual lists 521299 as an IW60RL internal pump/tube/probe kit. It is not identified there as a universal IW60 part.
Combustion-air sensing The 233229 air-pressure switch is separate from the 233237 water-flow sensor.
Ignition and temperature protection The 233245 electrode/probe, 233231 overheat sensor, 233253 limit and 233307 freeze valve each serve different functions.
Gas system The 161248 gas valve and 161249 regulator are separate components; preserve the original pressure and gas installation arrangement.
Control options 161291 (white) and 161292 (black) are listed on-demand control centres; confirm the original connector and heater model.

Original manufacturer illustration

Suburban factory replacement-parts drawings, including the Nautilus blower and flow sensor. Use the full factory manual for the model-specific connection and service procedures.

Enlarge the factory illustration

Open the original manufacturer's PDF to inspect small part positions and labels.

View the manufacturer diagram (PDF)

Before choosing or replacing a component

The manufacturer documents IW60 and IW60RL with different main boards and a recirculation kit specific to IW60RL. Use the heater's model and serial number rather than assuming one Nautilus part fits every version. Electrical and LP-gas service belongs with a qualified RV technician. Before maintenance, shut off the gas and electrical supplies and drain the water system in accordance with the factory manual.

Original manufacturer reference documents

Suburban May 2026 parts manual, Nautilus parts on pages 12–14Suburban original IW60/IW60RL operation and maintenance instructions

Other RV parts-reference pages

View the matching products

Choose a photograph to open the corresponding NewRVParts listing. Exact model and manufacturer numbers help distinguish parts that can look similar.

Product photograph of Suburban Nautilus IW60 complete heater (manufacturer part 5581A)5581A — Suburban Nautilus IW60 complete heaterIW60 system; confirm model plate before parts selectionProduct photograph of Suburban Nautilus IW60RL complete heater (manufacturer part 5280A)5280A — Suburban Nautilus IW60RL complete heaterIW60RL recirculating-loop versionProduct photograph of Suburban IW60 ignition control module (manufacturer part 521135)521135 — Suburban IW60 ignition control moduleIW60 board, not the IW60RL circuit boardProduct photograph of Suburban IW60RL ignition control module (manufacturer part 521212)521212 — Suburban IW60RL ignition control moduleIW60RL board; match the installed serial/modelProduct photograph of Suburban Nautilus water-flow sensor (manufacturer part 233237)233237 — Suburban Nautilus water-flow sensorDemand water-flow sensingProduct photograph of Suburban Nautilus gas valve (manufacturer part 161248)161248 — Suburban Nautilus gas valveGas-control valve, separate from the regulatorProduct photograph of Suburban IW60RL internal pump/tube/probe kit (manufacturer part 521299)521299 — Suburban IW60RL internal pump/tube/probe kitCurrent factory parts catalog specifies this as IW60RL kitProduct photograph of Suburban Nautilus air-pressure switch (manufacturer part 233229)233229 — Suburban Nautilus air-pressure switchCombustion-air proof switch

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