Suburban ST-42 & ST-60 Tankless RV Water Heater Illustrated Parts Guide

The Suburban ST-42 and ST-60 heat water on demand but have different burner ratings and model-specific electronic control-board kits. The ST-42 is the 42,000 BTU model 5381A; the ST-60 is the 60,000 BTU model 5382A. Most service parts can be identified from Suburban's factory parts list and the model plate rather than the RV's model year.

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 233678 Water Heater Controller for ST60 — Suburban ST-42 & ST-60 Tankless RV Water Heater Illustrated Parts GuideSuburban 233678 Water Heater Controller for ST60Part 233678
Suburban 6285APW RV Water Heater Access Door For ST-42 & ST-60 On Demand Models — Suburban ST-42 & ST-60 Tankless RV Water Heater Illustrated Parts GuideSuburban 6285APW RV Water Heater Access Door For ST-42 & ST-60 On Demand ModelsPart 6285APW

Factory part numbers and model differences

Suburban part Service item Model identification
5381A ST-42 complete water heater, 42,000 BTU ST-42 only
5382A ST-60 complete water heater, 60,000 BTU ST-60 only
521338 Electronic module-board kit ST-42; do not use ST-60 board
521339 Electronic module-board kit ST-60; do not use ST-42 board
233665 Water-flow sensor ST-42 and ST-60
233676 Manual-reset high-temperature limit switch ST-42 and ST-60
233675 Antifreeze temperature-limit switch Verify exact existing assembly
233658 Combustion-airflow sensor ST-series service part
161357 Schuste gas-valve service part Match original Schuste valve
525214 Telco gas-valve service part Different manufacturer valve version
233678 Digital control center Listed in ST-series factory parts section
233682 Seven-amp service fuse ST-series fuse; check existing marking
6285AEB Black exterior access door ST-42/ST-60
6285APW White exterior access door ST-42/ST-60
525175 ST exterior door sealing gasket Door seal, not a complete access door

What to identify before ordering

Part or feature Why it matters
Control board The ST-42 uses 521338 and the ST-60 uses 521339; identify the heater and the original board marking.
Water-flow sensing Part 233665 detects water demand; the 233676 part is a manual-reset limit switch and serves a different purpose.
Gas-valve version Suburban lists both Schuste 161357 and Telco 525214 valves. Match the installed valve; do not treat them as universal substitutes.
Exterior access door The 6285AEB black and 6285APW polar-white doors fit ST-series cabinets; each door is ordered separately.
Electrical and water connections The manufacturer specifies 12V DC, 0.7 GPM minimum water flow, and 1/2-inch male NPT hot/cold connections.
Temperature probe connectors Match connector shape and installed part; the 2026 factory list groups female/male probe descriptions under 233685.

Original manufacturer illustration

Suburban ST-series original unit layout and drain connection illustration. 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

Select replacements from the actual heater model and serial number. The board kits and gas-valve versions are not interchangeable by appearance. The manufacturer specifies professional service for gas, combustion, electrical and pressure-relief components. The heater must be drained and protected against freezing according to Suburban's instructions.

Original manufacturer reference documents

Suburban May 2026 RV Appliances Parts Manual — ST-series service parts, page 12Suburban ST-42/ST-60 original operation and installation manualSuburban ST-42/ST-60 official size, connection and BTU specifications

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 ST-42 42,000 BTU water heater (manufacturer part 5381A)5381A — Suburban ST-42 42,000 BTU water heaterST-42 complete heater; check whether the exterior door is includedProduct photograph of Suburban ST-60 60,000 BTU water heater (manufacturer part 5382A)5382A — Suburban ST-60 60,000 BTU water heaterST-60 complete heater, not a service boardProduct photograph of Suburban ST water-flow sensor (manufacturer part 233665)233665 — Suburban ST water-flow sensorFlow-detection part for ST-42 and ST-60Product photograph of Suburban ST manual-reset temperature limit switch (manufacturer part 233676)233676 — Suburban ST manual-reset temperature limit switchTemperature-safety switch, not a water-flow switchProduct photograph of Suburban ST-42 control-board replacement kit (manufacturer part 521338)521338 — Suburban ST-42 control-board replacement kitOnly for the matching ST-42 board configurationProduct photograph of Suburban ST-60 control-board replacement kit (manufacturer part 521339)521339 — Suburban ST-60 control-board replacement kitSeparate ST-60 board kit; not the ST-42 boardProduct photograph of Suburban ST Schuste gas-control valve (manufacturer part 161357)161357 — Suburban ST Schuste gas-control valveSchuste version; compare the original valve makerProduct photograph of Suburban black ST-series exterior access door (manufacturer part 6285AEB)6285AEB — Suburban black ST-series exterior access doorBlack door for ST-42/ST-60 casing

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