Suburban SW6D 6 Gallon RV Water Heater – 5238A

The Suburban SW6D 5238A is a 6-gallon LP gas RV water heater with Direct Spark Ignition (DSI). It is designed for RV owners who want a reliable, simple propane-only water heater without a 120V electric heating element.

The SW6D uses a 12,000 BTU burner and electronic ignition, allowing the water heater to light automatically from the RV’s interior switch without manually lighting a standing pilot.

Model & SKU

Model: SW6D
Current Suburban SKU: 5238A
Legacy SKU References: 5138A / 5138E
Tank Capacity: 6 Gallons
Fuel Type: LP Gas
Ignition: Direct Spark Ignition
BTU Rating: 12,000 BTU

Direct Spark Ignition

The SW6D uses a 12V Direct Spark Ignition system.

When the water heater is switched on, the control system automatically:

• Opens the gas valve

• Produces spark at the burner

• Ignites the propane

• Monitors the flame

• Shuts the burner down once the thermostat is satisfied

There is no standing pilot flame to light manually.

Propane-Only Operation

The SW6D is gas-only.

It does not include a 120V AC electric heating element.

If you need a 6-gallon Suburban water heater with both propane and electric heating capability, look at models such as:

• SW6DE

• SW6DEL

• SW6DEC / SW6DELC

6 Gallon Tank Capacity

The SW6D uses a traditional 6-gallon porcelain-lined steel tank.

Suburban tank water heaters are known for using a replaceable anode rod to help protect the steel tank from corrosion.

Routine anode inspection and replacement can significantly help extend tank life.

Common Replacement Parts

The SW6D shares many common service parts with other Suburban SW-Series water heaters, including components such as:

• 525007 – 12V Thermostat / Hi-Limit Switch

• 525022 – Thermostat / Hi-Limit Cover

• 525005 – Ignition Electrode Kit

• 520814 – Ignition Control Board on applicable serial ranges

• 233514 – Magnesium Anode Rod

• Burner and orifice components

• Gas valve components depending on production range

Always verify the water heater serial number before ordering components that have production breaks.

Signs the SW6D May Be a Good Replacement

The Suburban SW6D is a good replacement option when:

• Your existing 6-gallon Suburban gas water heater has failed

• You want propane-only operation

• You do not need a 120V electric heating element

• You want automatic electronic ignition

• You are replacing an older SW6D or compatible 6-gallon Suburban installation

Installation Fitment

The SW6D is designed around the traditional Suburban 6-gallon water-heater footprint.

Before ordering, verify:

• Existing opening dimensions

• LP gas connection

• 12V DC power availability

• Exterior access-door compatibility

• Plumbing connection location

The exterior access door may be sold separately depending on the package.

Recovery & Heating Performance

The 12,000 BTU burner provides fast recovery for a 6-gallon tank and is designed for standard RV hot-water demands such as:

• Showers

• Kitchen sink use

• Bathroom sink use

• General washing

The burner cycles automatically as water temperature drops.

Maintenance

Routine maintenance should include:

• Inspecting the anode rod

• Flushing sediment from the tank

• Checking the burner tube for debris or insect nests

• Inspecting the ignition electrode

• Checking propane pressure

• Inspecting wiring and thermostat connections

• Verifying the pressure-relief valve is operating correctly

Proper maintenance helps improve heating performance and extend water-heater life.

Product Specifications

Manufacturer: Suburban / Airxcel
Model: SW6D
SKU: 5238A
Legacy SKU: 5138A / 5138E
Tank Capacity: 6 Gallons
Fuel: LP Propane
Ignition: Direct Spark Ignition
BTU Input: 12,000 BTU/hr
Electric Heating Element: No
Electrical Requirement: 12V DC for ignition and controls
Tank Construction: Porcelain-Lined Steel
Anode Rod: Yes
Application: RV / Travel Trailer / Fifth Wheel / Motorhome

Important Fitment Note

The SW6D is a propane-only DSI water heater.

If your existing unit is an SW6DE or SW6DEL, those models include 120V electric heating capability and are not functionally identical to the SW6D.

Verify the complete model number on your existing water-heater data plate before ordering.