How to Replace the Anode Rod in a Caravan Hot Water System

💦 Replacing the Anode Rod in a Caravan Hot Water System

Share It!

Did you know that replacing the anode rod in your caravan hot water system is something that you should be doing periodically? Neither did I before becoming a caravan owner myself. There’s always something new to learn as a caravanner!

Replacing the sacrificial anode rod is something that needs to be done every six to twelve months in your caravan. The sacrificial anode is a vital part of your caravan hot water system, which is designed to prevent rust and corrosion inside your water heater. Changing the anode is a fairly simple task, which you can DIY yourself with a few basic tools and knowledge.

We are a participant in affiliate advertising programs designed to provide a means for us to earn fees by linking to and other affiliated sites. We may earn a commission from your purchases at no extra cost to you. For more information, see our disclosures here.

What is a Sacrificial Anode Rod?

The Sacrificial Anode Rod is a part installed in your caravan hot water system, which does just as its name suggests. It quite literally ‘sacrifices’ itself so as to prevent corrosion within your hot water system.

Checking the Caravan Hot Water System Anode Rod
Caravan hot water system anode rod

As the anode rod is made of a softer metal (magnesium) than the water tank, it bears the corrosion. As this part is designed to break down, it only makes sense that you’ll need to replace the anode every so often, essentially extending the life of your caravan hot water tank.

Hot water tanks that are made from stainless steel do not corrode, therefore do not have an anode rod. However, the suburban hot water system, which is one of the most widely used in caravans and RVs in Australia, is made from a different metal that will corrode if you don’t keep on top of your anode rod replacements.

Aus Line Break

How Often Should You Replace the Anode in a Caravan?

You should be checking the anode in your caravan every six months to see if it needs to be replaced.

Along with that, if you’re about to head off on a big trip, especially heading off the beaten track or into the outback, you should double check that your anode still has plenty of life left in it.

Hot Water System Anode Rod (old vs. new)
New versus old anode rods

Once your anode has corroded to about 50% of its original diameter – it’s time to change it. You can leave it to a maximum of 75% of it’s original diameter, but letting it go beyond that (or overextending the anode’s life regularly) will only harm your hot water tank.

The wear of your anode can be very dependent on the quality of water that is being run through the hot water system. Travelling through areas with ‘harder’ water (higher concentration of calcium and magnesium ions) will work through your anode at a faster rate.

Aus Line Break
Aus Line Break

How to Change an Anode Rod in a Caravan Hot Water System

Replacing the Anode in your caravan hot water system is a simple task, which you can do yourself at home if you’re handy with basic tools. You don’t need a lot of equipment for the job, so let’s get into it.

Tools required for changing an anode

These are the tools that we use for changing the anode. Yours may vary a little.

  • 27mm 6 Point Socket
  • New Anode Rod
  • Ratchet or Extension Ratchet
  • Pipe cleaning brush
  • Plumber’s Teflon Thread Tape

Steps for Changing the Caravan Hot Water Anode

Here is the step-by-step guide on how to change the anode rod in your caravan hot water system.

STEP 1 – Turn the power off

The first step is to switch off the power to your hot water heater well and truly before you’re ready to change the anode. You need to give the water time to cool down so that you don’t burn yourself when you remove it.

Below are the instructions depending on whether you’re on mains power or gas at the time.

  • Mains Power – switch off the power supply to the hot water system and unplug the 240-volt power to the heater.
  • Gas – completely turn the gas supply off at the bottles.

Let the water in the tank cool right down to avoid burns.

STEP 2 – Switch the water off

If you’re on tank water, you’ll need to switch the water pump off inside the van. Be aware that this process will use a fair bit of water, so you’re better off doing it when you’re hooked up to town water.

If you’re on mains water, go and switch the water tap off.

STEP 3 – Release the pressure

Next, you need to release the pressure in your tank by turning on the hot water tap inside your caravan. Leave it on until the water stops running to ensure the tank has depressurised.

Pressure Relief Valve
Open the pressure relief valve

Then head back outside to your hot water system access hatch and open the pressure relief valve. This will ensure that there’s no pressure left in the tank.

STEP 4 – Remove the anode

Click the socket and ratchet together, then attach the socket to the anode end and turn it anti-clockwise to undo. You may have to use a bit of force to loosen the anode, especially if it hasn’t been inspected or changed for a while.

Undoing the Anode, Caravan Hot Water System
Undo the anode > anti-clockwise

Once it’s undone, you can pull out the anode. As you remove it, water will gush out, so grab a bucket or just let it water the grass.

If your anode still has plenty of life left, you can put it aside to reinstall, but you’ll still need to follow the rest of the steps here first.

STEP 5 – Flush & clean the tank

Now it’s time to flush out the gunk and anode residue from the tank. For this, you’ll need to turn the mains water (or pump) back on so that the water can keep flushing the tank.

Don’t turn the power back on just yet because you don’t want the water to start heating up.

Replacing Anode - Flush & Clean Tank
Flush & clean the tank

This is where you can use the brush on the end of some wire to get in there and give the tank a good clean out.

Once the water runs clear, go and switch the mains water back off.

STEP 6 – Apply thread tape to the new anode

Applying thread tape to new anode rod

While your tank finishes emptying, you can go ahead and add some plumber’s thread tape to the thread of the new anode.

You may find that yours has come pre-wound with tape, but more often than not, you’ll need to add your own.

The thread tape helps to seal the thread and reduces the chance of any future leaks. If you’re reinstalling the old anode, you’ll still need to apply some fresh thread tape.

STEP 7 – Install new anode

Now you can slide the new anode into the hot water system, turning it clockwise to tighten it with your fingers. Then you can tighten it even further with the socket.

Apply thread tape & install new Anode
Apply thread tape & install new anode > clockwise

The anode might not tighten all the way to the end of the thread, so be careful not to over-tighten or cross-thread it.

STEP 8 – Turn the water on & ‘bleed’ the tank

Now that the anode has been installed, go and turn your water back on and allow the tank to fill itself back up. Check for leaks around the thread of the anode and give it a little tighten if necessary.

Turn on one hot water tap inside the van until the water runs through the tap, then turn it off.

Head back outside to the hot water system and ‘bleed’ the air out of the tank by opening the pressure relief valve until the water runs continuously.

STEP 9 – Turn the power & gas back on

Replacing the anode in the caravan has been successfully completed.

You can now switch the 240-volt power back on and plug the hot water system back in (if you unplugged it). You can also turn the gas back on at the bottles if applicable.

*Note: Never ever leave the power switched on while the water tank is empty or turn the power back on before letting the tank fill back up with water – you will burn out the element.

Winter Tip

You can use the process here for emptying out your caravan hot water system in winter if you wish. This is especially useful if being stored in very cold temperatures where water freezing is a concern. Just remember to always refill the hot water tank before turning the power on.

Aus Line Break

▶️ VIDEO: Replacing the Anode Rod in a Suburban Hot Water System

Check out the video below to see exactly how to change the anode rod in a Suburban hot water system.

The Suburban water heaters are very popular in Australian caravans, campers and RVs. But even if you don’t have the Suburban system, this will give you a good visual guide on how to replace the anode yourself.

Next, it’s time to tackle your water tanks.
Here’s how to clean the caravan water tanks in 7 simple steps!

Caravan Maintenance & Service Log

Caravan Maintenance & Service Log

Log and track all of your caravan maintenance and servicing requirements.

  • 7-page Planner (digital & printable)
  • Caravan Service History Log
  • TICK OFF checklists
  • COMPLETE maintenance tasks
  • ADD in extra tasks
  • RECORD maintenance & service dates
Aus Line Break

Travel Planning Tools

Travel Checklists
Planners & Guides
Budget Spreadsheets

Pin It!

How to Replace a Caravan Anode Rod (Hot Water Heater) - PIN

Share It!

2 thoughts on “💦 Replacing the Anode Rod in a Caravan Hot Water System”

  1. Suburban Hot Water System
    Hi my thoughts on anode for these heaters.
    1 Make sure you buy the correct metal type for your heater.
    2 If you place a small 3/8 diam wooden dow into heater you can feel a pipe at rear of heater inline with where the anode fits if anode is too long it will damage this pipe due to vibration. There are various lengths of anodes.
    3 A lot of sealing tape will insulate the anode and stop it from working properly. Tape needs to be placed only at rear of thread so that there is a metal to metal connection with the thread and heater.
    Just my 10 cents worth that may help others from having problems.
    Cheers Dean

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top