Suburban 6 Gallon Water Heaters

What does the SW6DE model number mean on a Suburban water heater?

Suburban's model code breaks down clearly: SW = Suburban Water heater, 6 = 6-gallon tank capacity, D = DSI (Direct Spark Ignition), E = Electric element. So an SW6DE runs on both LP gas with electronic ignition and 120V AC electric, giving you two ways to heat water depending on whether you're on shore power or boondocking. If you only see SW6D (no E), that unit is gas-only with no electric element.

Will a Suburban 6 gallon water heater fit my RV?

The SW6DE and other 6-gallon Suburban units use a standard 12-3/4" x 12-3/4" cutout, which matches most RV water heater openings from the past two decades. Confirm your existing cutout dimensions and check whether your current unit is a Suburban or an Atwood/Dometic, since the door frames and mounting flanges differ. If you need a larger capacity, see our 10 gallon RV water heater collection for compatible upgrades.

What replacement parts are commonly needed for the SW6DE?

The most frequent SW6DE service items are the anode rod (Suburban tanks are porcelain-lined steel and require an anode), the thermostat/ECO switch, the gas valve, the circuit board, and the 120V heating element. Replacing the anode rod annually is the single biggest factor in tank longevity. For winter storage, pair your service work with our RV winterizing kits to drain and protect the tank during freezing months.

Does the Suburban SW6DE need shore power to make hot water?

No. The SW6DE heats water on LP gas alone using its DSI ignition, which only draws a small amount of 12V DC from your house batteries to fire the spark. Shore power or generator power is only required if you want to use the 120V AC electric element, which is useful for conserving propane at full hookup sites. For other 12V-dependent systems in your rig, see our RV electronics collection.