Suburban SW6DEL RV Water Heater | 6 Gal | Gas + Electric | DSI

Restore or upgrade your RV's hot water system with the Suburban SW6DEL 6-Gallon RV Water Heater (Direct Spark Ignition + Electric, Part #5240A / 5140A). Dual-fuel 6-gallon tank with propane Direct Spark Ignition PLUS 120V AC electric heating element and 12V DC interior switch relay — the full-featured tier of the Suburban SW6 platform.

Understanding the SW6DEL Naming

The Suburban model naming breaks down as:

• SW — Suburban Water Heater platform
• 6 — 6-gallon tank capacity
• D — Direct Spark Ignition (DSI) gas heating, 12V DC controlled
• E — 120V AC Electric heating element
• L — 12V DC Relay for interior operation of the electric element

The "L" is the critical differentiator — it means you can control the 120V electric element from an interior 12V DC switch, rather than having to physically access the water heater to activate/deactivate electric heating.

Dual Heating — Faster Recovery Two Ways

• Gas Recovery: 10.1 gallons/hour (12,000 BTU DSI)
• Electric Recovery: 6.1 gallons/hour (1,440W)
• Combined (Gas + Electric Simultaneously): Up to 16.2 gallons/hour — fastest possible recovery

Perfect for shore power camping (use electric to save propane) or boondocking (use gas), and combined mode for extreme demand.

Need More Capacity?

If a 6-gallon tank isn't enough for your hot water needs, larger options offer the same feature set with more capacity:

• Suburban SW10DEL — 10-Gallon Water Heater
• Suburban SW12DEL — 12-Gallon Water Heater

Interior 12V Electric Switch Control

The 12V DC relay controls the 120V electric heating element — meaning you can turn electric heat on/off from a wall-mounted switch inside your RV rather than requiring physical access to the heater. Much more convenient than models without the interior switch feature.

Long-Life Tank Construction

• Porcelain-lined steel tank
• Replaceable anode rod — absorbs corrosive electrolysis to extend tank life

Anode rod maintenance is a key ownership consideration — replace annually or as needed to protect the tank from corrosion.

Physical Dimensions

Product Size: 12.69"H × 12.69"W × 19.19"D
Cutout Dimensions: 12.75"H × 12.75"W × 19.19"D

Weight

• Empty: 36 lbs
• Full (with water): 86.04 lbs

⚠️ Critical Operating Note — NEVER RUN DRY

Always ensure the tank is completely full of water before activating either the gas burner OR the electric element. Activating the heating element in a dry tank will burn it out in seconds — this is the most common preventable failure of RV water heaters.

Winterizing

For RVs going into storage during freezing temperatures:

• Drain the tank completely
• Remove the anode rod completely

Troubleshooting

If the electric heating element stops working:

• Check 120V AC power supply
• Check the thermostats (upper/lower cutoff)
• Measure heating element resistance with an ohmmeter

Learn More

For more detail on tankless vs tank water heater options and troubleshooting: RV Tankless vs Tank Water Heaters and RV Water Heater Replacement Guide.

Cross-Reference Part Numbers

• Model: SW6DEL
• Part Numbers: 5240A, 5140A

⚠️ Professional Installation Recommended

Involves propane gas connections, 120V AC electrical wiring, 12V DC control wiring, and water plumbing. Installation should be performed by a qualified RV service technician.

2-Year Limited Manufacturer Warranty + 3-Year Tank Warranty

Genuine Suburban OEM

Key Features

• Genuine Suburban OEM RV water heater
• Model: SW6DEL (Parts 5240A / 5140A)
• 6-gallon capacity
• Direct Spark Ignition (DSI) gas system — 12,000 BTU, 10.1 gal/hr recovery
• 120V AC electric element — 1,440W, 6.1 gal/hr recovery
• 12V DC interior switch relay — control electric element from inside the RV
• Combined operation — up to 16.2 gal/hr max recovery
• Porcelain-lined steel tank
• Replaceable anode rod
• Cutout: 12.75" × 12.75" × 19.19" deep
• Weight: 36 lbs empty, 86.04 lbs full
• Backed by 2-year limited manufacturer warranty + 3-year tank warranty

Specifications

• Brand: Suburban
• Model: SW6DEL
• Part Numbers: 5240A, 5140A
• Type: RV Dual-Fuel Water Heater (Gas + Electric)
• Capacity: 6 gallons
• Gas Ignition: Direct Spark Ignition (DSI), 12V DC controlled
• Gas Input: 12,000 BTU/hr
• Electric Element: 120V AC, 1,440 W
• Interior Switch: 12V DC relay-controlled
• Recovery Rate (Gas): 10.1 gallons/hour
• Recovery Rate (Electric): 6.1 gallons/hour
• Recovery Rate (Combined): Up to 16.2 gallons/hour
• Tank Construction: Porcelain-lined steel
• Anode Rod: Replaceable
• Product Dimensions: 12.69"H × 12.69"W × 19.19"D
• Cutout Dimensions: 12.75"H × 12.75"W × 19.19"D
• Weight (Empty): 36 lbs
• Weight (Full): 86.04 lbs
• Warranty: 2-year limited manufacturer + 3-year tank