Suburban 10/12 Gallon Water Heaters

What Suburban water heater models does this collection cover?

This collection covers Suburban's 10 and 12 gallon RV water heaters, including the SW10DE, SW10DEL, SW12DE, and SW12DEL series, plus the related Nautilus and SAW6D family parts that share components. Suburban's part numbering follows a clear pattern: SW = Suburban Water Heater, the number is gallon capacity, D = Direct Spark Ignition (DSI), and E = electric element. Confirm your exact model number from the data plate inside the access door before ordering. If you have a 6 gallon unit, check our 10 gallon RV water heater collection for the closest equivalents.

What is the difference between a 10 gallon and 12 gallon Suburban water heater?

The 12 gallon Suburban holds two more gallons of hot water and uses a slightly larger tank footprint, so it is not a drop-in replacement for a 10 gallon cutout without modification. Both sizes run on LP gas, electric element (typically 1440 watts on the DE/DEL variants), or both simultaneously, and both use a porcelain-lined steel tank with an anode rod for corrosion protection. If you are upgrading from 10 to 12 gallons, measure your existing cutout and verify clearance behind the unit before ordering.

Do I need to replace the anode rod on a Suburban water heater?

Yes. Suburban tanks are porcelain-lined steel and rely on a magnesium or aluminum anode rod to absorb corrosion. Inspect the anode every 6 to 12 months and replace it when more than 75% of the material is consumed. Drain and flush the tank at the same interval to clear sediment, which protects the electric element and improves recovery time. Pair anode replacement with off-season tank protection from our RV winterizing kits collection to prevent freeze damage.

What replacement parts are available for Suburban 10 and 12 gallon water heaters?

Common replacement parts in this collection include the circuit board (ignition control), gas valve, thermostat and ECO switch, electric heating element (1440W), anode rod, T&P relief valve, burner assembly, and door panels. Most failures on DSI units trace back to the board, gas valve, or thermostat, in that order. Confirm your model and serial number before ordering, since board part numbers changed across production runs.

Does Suburban water heater shipping qualify for free freight?

Replacement parts (boards, valves, elements, anode rods, thermostats) ship standard and qualify for free shipping on orders over $100. Complete 10 and 12 gallon water heater units ship via truck freight due to size and weight, with freight quoted at checkout. If you need help confirming fitment before placing a freight order, text or call our team at 817-984-1852.

Can I run a Suburban water heater on electric and gas at the same time?

Yes, on DE and DEL models. Running both LP gas and the 1440 watt electric element together roughly doubles recovery speed, useful when multiple people need back-to-back showers. On 30 amp shore power, factor the element's 12 amp draw into your total load before turning on the AC or microwave. The gas-only SW10D and SW12D models do not include the electric element circuit.