Suburban Model Number SW4D Water Heater 4 Gallon - S6U5135A

Suburban Model Number SW4D Water Heater 4 Gallon - S6U5135A

The Suburban Advantage line of RV water heaters includes high recovery gas, gas/electric combination, gas/electric/motor aid and tankless, continuous models with sizes and features to match the requirements of almost any RV. Tank capacities include 4, 6, 10, 12 and 16 gallon models and tankless models provide up to 60,000 BTUH of endless hot water. Quality, efficiency, features, service, and selection - for more than 30 years, these have been the gold standard of Suburban water heaters. Take ADVANTAGE of Suburban’s expertise and reliability with longer lasting residential style tank and tankless water heaters.

Features

• Features An Indoor Mounted Switch Which Controls The Water Heater Ignition And Operation
• Porcelain-Lined Steel Tank For Long Life
• Replaceable Anode Rod Provides Further Corrosion Protection
• Fast Recovery Rate
• Convenient Exterior LP Gas Line Connection
• One-Piece, Die-Formed Metal Control Housing Protects Controls From The Weather
• Copolymer Insulation Jacket Specially Fitted To The Tank To Retain Heat
• Limited 2 Year Warranty And Limited 3 Year Tank Warranty

Specifications

What our Experts Think

• Compact RV‑Focused Hot Water: Designed for small RVs and campers with a 4‑gallon capacity and 9,000 BTU LP gas input, this unit delivers reliable hot water in tight spaces.

• Direct Spark Ignition (DSI): Experts favor the DSI system for quick, dependable starts without a standing pilot light — ideal for mobile environments.

• Durable Construction: Porcelain‑lined steel tank with a replaceable anode rod resists corrosion and extends service life — a benefit for frequent travelers.

• Efficient Heat Transfer: Suburban’s flue design maximizes combustion heat transfer to the tank, improving overall heating efficiency.

• Fast Recovery: Gas‑only operation offers a respectable hot water recovery rate (~7.6 GPH) for its size, keeping showers and cleanup quick

Q&A

Q: What is the Suburban SW4D (S6U5135A)?
A: A compact 4‑gallon LP gas water heater for RVs and campers with Direct Spark Ignition (DSI) for easy, match‑free start‑ups.

Q: How is the water heated?
A: It uses 9,000 BTU propane gas and a direct spark ignition system to rapidly heat stored water.

Q: What are the key features?
A: Porcelain‑lined steel tank for durability, replaceable anode rod to reduce corrosion, efficient flue tube for faster heating, and compact build for small RV cut‑outs.

Q: What are the dimensions?
A: Approx. 12.69″ W × 12.69″ H × 16.13″ D — fits standard RV water heater openings.

Q: Does it include accessories?
A: The unit typically does not include an access door, on/off switch, or mounting hardware — sold separately.

Q: What is the recovery rate?
A: Heats at an efficient rate (approx. 7.6 gal/hour) for quick hot water availability.

Q: Warranty and durability?
A: Comes with a 2‑year limited warranty and 3‑year limited tank warranty.

Q: Ideal for whom?
A: RV, camper, and trailer owners who want a compact, dependable propane gas water heater for weekend trips or full‑time travel.

Maintenance Tips

• Annual Flush & Drain: Drain and flush the tank yearly (turn off gas and water first) to remove sediment and improve efficiency.

• Inspect & Replace Anode Rod: Check the sacrificial anode rod yearly and replace if heavily corroded to protect the porcelain‑lined steel tank from rust.

• Check Pressure‑Temperature (P&T) Valve: Test the pressure relief valve annually to ensure it opens freely and reseals properly for safety.

• Clean Burner & Vent: Keep the combustion chamber and vent openings clear of debris, insect nests, and obstruction to ensure proper airflow and ignition.

• Leak Inspection: Regularly check all LP gas and water connections for leaks; tighten or repair promptly with soapy water test.

• Safety Before Service: Always turn off LP gas before servicing; never operate without water in the tank to avoid damage.