Should I put an anode rod in my RV water heater?

Only if your tank is the type that takes one. Steel-lined tanks are designed around a sacrificial anode that is consumed protecting the tank and is replaced periodically. Aluminium-clad tanks are not, and fitting an anode to one causes damage rather than preventing it. Confirm your model before buying — this is the most common expensive mistake made on RV water heaters.

Hot water runs out after two minutes. Is the heater failing?

Often it is sediment rather than failure. Accumulated sediment occupies volume that should hold hot water and insulates the heating surface, so the tank both holds less and recovers more slowly. Flushing is part of routine service and frequently restores most of the lost capacity.

Why does my hot water smell like rotten eggs?

That smell is generally a reaction between the water supply and the anode rod in a steel tank, not contamination of the tank. It is addressed through flushing, sanitising, and in some cases a different anode material. It is unpleasant rather than hazardous, but it is worth dealing with because it indicates conditions inside the tank worth looking at.

No hot water at all after winter storage — where do I start?

With the bypass valve, before anything else. Winterisation sets the bypass so water routes around the tank, and if it was not returned to the run position the tank is simply empty. It presents as a completely dead water heater and it is free to rule out.

Repair guide

RV water heater repair

Whether the fault is gas-side, electric-side, or not the heater at all.

The tank-material distinction. Steel-lined tanks need a sacrificial anode rod and aluminium-clad tanks must not have one fitted — getting this wrong damages the tank, and it is the single most consequential RV water-heater fact an owner can know.

Stop-work system

Gas water heaters involve a propane burner and an exhaust path. Combustion appliances are a technician job.

Nothing on this page is a repair instruction for this system. What follows is what to observe and record so a technician can work efficiently — the work itself is theirs.

What brings owners here

No hot water on gas but fine on electric, or the reverse
No hot water at all in either mode
Water is warm but never hot, or runs out almost immediately
The heater cycles on and off rapidly
There is a rotten-egg smell in the hot water

What to observe and write down

These are observations, not repairs. Each one narrows the problem before anybody charges you for time.

01
Gas water heaters are a combustion appliance — do not work on the burner side
The gas side involves a propane burner and a vented exhaust. Soot at the exterior vent, a yellow rather than blue flame, or a gas smell means shut it off and call a technician. Nothing on the burner, exhaust, or gas valve is owner troubleshooting.
02
Check the bypass valve position first
If the water heater was winterised, the bypass routes water around the tank and it stays empty. Plenty of cold water with no hot water at all, especially on the first trip of the season, is this far more often than it is a failed heater. It costs nothing to check.
03
Note which mode fails
Gas only, electric only, or both. Both modes heat the same tank, so a failure in one mode alone eliminates the tank and points squarely at that mode’s own components.
04
Identify your tank material before touching an anode rod
Steel-lined tanks use a sacrificial anode rod that is consumed and replaced periodically. Aluminium-clad tanks are not designed for one and fitting an anode rod to them causes damage rather than preventing it. The model number tells you which you have — confirm it before you buy anything.
05
Look for a reset on the high-limit cutout
Many units have a manual reset for the over-temperature cutout. Knowing whether yours has tripped is useful information for a technician. A cutout that keeps tripping is reporting a real fault and must not be repeatedly reset as a fix.

How a technician works through it

Knowing the order matters: it tells you whether a quote skipped a step, and it tells you what a technician still has to establish before anyone can say what is wrong.

01
Confirm the tank is actually full and the bypass is set to run
An electric element energised in a dry tank fails almost immediately, so tank status is confirmed before the element is suspected — and before power is applied again.
02
Test the failing mode in isolation
Electric-side faults are usually the element, its thermostat, or supply; gas-side faults are supply, the valve, the burner, or flame sensing. Testing one mode at a time is what makes the split diagnostic.
03
Check the safety cutouts and what tripped them
A tripped high-limit is a symptom, not the fault. The reason it reached that temperature — a failed thermostat, sediment, or a control fault — is what actually gets repaired.
04
Inspect the tank interior condition and the anode where fitted
Sediment reduces capacity and causes rapid cycling, and a consumed anode in a steel tank means the tank itself has begun to be attacked. Both change whether this is a repair or a replacement.

What drives the cost

We publish no dollar figures anywhere on this site, because real prices vary by market, season, and technician, and a number we invented would look authoritative and help nobody. What is stable is what moves the number.

Whether the failure is a component (element, thermostat, valve, board) or the tank itself
Tank material and model, which determines both parts and whether an anode is part of the service
Access — water heaters are built into an exterior compartment and are usually straightforward, but plumbing connections vary
Whether a tankless conversion is being considered, which is a plumbing and gas-supply project as well as an appliance swap
Whether freeze damage is involved, which frequently affects the tank and the lines together

Before you weigh any of that, settle who is paying. Warranty, insurance, or you works through the order that protects a claim — because authorising a repair before you have the answer is what turns a covered failure into one you funded.

Mobile or shop?

Very well suited to mobile work. Elements, thermostats, cutouts, valves, anode service, flushing, and full unit replacement are all normal on-site jobs because the heater is accessed from an exterior compartment. There is rarely a reason to move an RV for water-heater work.

Common questions

Should I put an anode rod in my RV water heater?: Only if your tank is the type that takes one. Steel-lined tanks are designed around a sacrificial anode that is consumed protecting the tank and is replaced periodically. Aluminium-clad tanks are not, and fitting an anode to one causes damage rather than preventing it. Confirm your model before buying — this is the most common expensive mistake made on RV water heaters.
Hot water runs out after two minutes. Is the heater failing?: Often it is sediment rather than failure. Accumulated sediment occupies volume that should hold hot water and insulates the heating surface, so the tank both holds less and recovers more slowly. Flushing is part of routine service and frequently restores most of the lost capacity.
Why does my hot water smell like rotten eggs?: That smell is generally a reaction between the water supply and the anode rod in a steel tank, not contamination of the tank. It is addressed through flushing, sanitising, and in some cases a different anode material. It is unpleasant rather than hazardous, but it is worth dealing with because it indicates conditions inside the tank worth looking at.
No hot water at all after winter storage — where do I start?: With the bypass valve, before anything else. Winterisation sets the bypass so water routes around the tank, and if it was not returned to the run position the tank is simply empty. It presents as a completely dead water heater and it is free to rule out.

Sources for the claims on this page

Steel-lined RV water heater tanks use a sacrificial anode rod, while aluminium-clad tanks are not designed to use one; fitting an anode to the latter is contraindicated.
Industry consensusCross-manufacturer industry consensus distinguishing RV water heater tank constructions
Energising an electric heating element in an empty tank causes rapid element failure, which is why tank status is confirmed before electric operation.
Industry consensusIndustry-wide consensus for electric water heating elements
A gas water heater is a combustion appliance with a vented exhaust path, and faults in the burner or exhaust present a carbon-monoxide risk.
Industry consensusIndustry-wide safety consensus; mirrored in this site’s safety gate for water heaters

Related systems

Next step

Work through structured triage for this system and you will end up with a written service brief: what you observed, in what order, and what has not been established yet. It is the document that lets a technician quote properly instead of guessing on arrival.

Being straight about what this is. No technician is signed to any territory yet — not one. We do not match you, dispatch anyone, or promise a call. What you get is the brief, and a request form that copies it to us so we know the demand is real. If you need someone today, take the brief and send it to a local technician directly; it works just as well that way.

Start triage Request a technician