Heating Element for RV Hot Water Heater: What You Need to Know

RV water heaters are built differently than the tank units in a house — and understanding how the heating element fits into that system helps you diagnose problems, shop smarter, and know when a repair is something you can handle yourself.

How RV Water Heaters Work

Most RV water heaters operate in one of two modes: propane, electric, or both. Units that support both are often called dual-fuel or combo water heaters. The electric heating element is what powers the water heater when you're connected to shore power at a campsite — it does the same job propane does, just using electrical resistance heat instead of a flame.

The element itself is a metal rod (typically made of copper with a steel or magnesium casing) threaded into the tank. When electricity runs through it, it heats up, transferring that heat to the surrounding water. Most RV water heater elements are 120-volt AC and draw somewhere in the range of 1,000 to 1,500 watts, though the exact specs depend on the unit.

Common RV Water Heater Brands and Compatibility

The two most widely installed brands in RVs are Suburban and Atwood (now sold under the Dometic name). These brands use elements with different thread sizes and designs, so parts are not always interchangeable.

Always verify the model number on your unit before ordering a replacement element. Using the wrong element — even one that physically fits — can damage the tank or thermostat.

Signs Your Heating Element Has Failed 🔧

If your RV water heater works fine on propane but produces no hot water on electric mode, the element is the first thing to check. Other symptoms include:

• Tripped circuit breaker that keeps resetting
• Hot water that runs out unusually fast (partial element failure)
• Discolored or metallic-tasting water (element corrosion)
• Visible cracks or buildup on the element itself when inspected

A failed element won't always be obvious from the outside. Testing with a multimeter set to resistance (ohms) is the most reliable way to confirm failure — a functioning element will show some resistance; an open circuit reading means the element is burned out.

How to Test and Replace an RV Water Heater Element

Before anything else: turn off power to the water heater at the breaker and let the water cool completely. Working on a live or hot tank creates real risk of shock or burns.

The general process:

1. Drain the tank using the drain plug or anode rod port
2. Locate the element — usually behind an access panel on the exterior of the RV
3. Disconnect the wiring and test the element with a multimeter
4. Unscrew the element using an element wrench (a standard socket won't fit most RV elements)
5. Inspect the tank interior for sediment or corrosion while it's open
6. Install the new element with a fresh gasket — do not overtighten
7. Refill the tank completely before restoring power — running the element dry burns it out immediately

This is a repair many RV owners handle themselves. The parts are relatively inexpensive — elements typically run $15–$40 depending on the brand and wattage — and the labor involved is straightforward if you're comfortable with basic electrical work and have the right socket wrench.

The Anode Rod Connection

Many RV water heaters use a magnesium anode rod that threads into the same port as the drain plug. This rod sacrifices itself to protect the tank walls from corrosion. On some Suburban units, the anode rod and drain plug are combined into one component. If you're already draining the tank to replace the element, it's a good time to inspect the anode rod — they typically need replacement every 1–3 years depending on water quality and usage.

Atwood/Dometic tanks use aluminum tanks instead of steel, so they don't use anode rods. That's an important distinction when buying parts.

Variables That Shape the Repair

How this repair plays out depends on several factors:

• Your specific make and model — element specs, thread size, and wattage vary
• Tank age and condition — older tanks may have corrosion around the element port, complicating removal
• Water quality — hard water accelerates sediment buildup and element wear
• Shore power availability — if you rarely use electric mode, element failure might go unnoticed for seasons
• DIY comfort level — the job is manageable, but incorrectly installed elements or improper reassembly can cause leaks or electrical hazards

Parts availability also varies. RV-specific heating elements aren't always stocked at general hardware stores, though they're widely available through RV supply retailers and online.

What the Repair Can't Tell You on Its Own

Replacing the element solves the problem when the element itself has failed. But if the element tests fine and you're still getting no heat on electric mode, the issue may lie with the thermostat, the ECO (emergency cut-off) switch, the wiring, or the circuit breaker itself. Those components each fail independently and require separate diagnosis.

The condition of your specific tank, the age of your water heater, and how your RV's electrical system is configured are the pieces that determine whether this is a quick parts swap or the start of a longer diagnostic process.