Camco 11553 Magnesium Anode Rod for Atwood Heaters

The Camco 11553 is a magnesium anode rod built to thread into Atwood RV water heaters. It's a small part that does a big job. Screw it into the tank's drain port and it quietly takes the corrosion that would otherwise eat at your heater. We've swapped a lot of these on the bench and out at the campground, and the story is always the same. An inexpensive rod protects a water heater that costs a whole lot more to replace.

Here's how a sacrificial anode works. Magnesium is more reactive than the metal of your tank, so the corrosive elements in your water go after the rod first. The rod gives itself up, bit by bit, and your tank stays clean on the inside. That's the whole idea. You're trading a cheap piece of magnesium for the long life of the tank behind it. When the rod is mostly gone, you thread in a fresh one and start the clock over.

This particular rod is sized for Atwood water heaters. It measures 4-1/2 inches long and 1/2 inch in diameter, with a 1/2 inch NPT tapered thread. Atwood tanks are aluminum, so they don't ship with a factory anode the way steel tanks do. A lot of owners still add a magnesium rod like this one for extra protection, especially if you camp where the water runs hard or smells of sulfur. It threads into the same 1/2 inch NPT port, so you're not drilling or modifying anything.

Installing it is straightforward. Kill the power and the propane to the heater and let the water cool. Shut off the water supply and relieve the pressure by opening a hot tap. Pull the drain plug or the old anode with a 1-1/16 inch socket. Let the tank drain fully and flush out any sediment while you're in there. Wrap the new rod's threads with a few turns of PTFE tape, thread it in by hand, then snug it down with the socket. Refill the tank, check for leaks, and you're done. Fifteen minutes start to finish, once you've done a couple.

Why magnesium and not aluminum? Magnesium is the more active metal, so it protects harder and it's the better choice for most fresh water. It does sacrifice itself faster, which just means you check it more often. Aluminum rods last longer in hard water but don't protect quite as aggressively. For the average RV owner filling up from campground spigots and the occasional questionable well, magnesium is the safe pick. That's what you get here.

Plan on pulling the rod once a season to see how it's doing. If it's down to the steel core wire or it's lost most of its diameter, replace it. A rod that's completely consumed isn't protecting anything anymore. Some owners in soft or aggressive water go through one a year. Others stretch it to two seasons. Pull it, look at it, and let the rod tell you. It's cheap insurance either way.

There's a bonus to running an anode too. Every time you pull it to check it, you've got the tank open to flush. Sediment and mineral scale settle at the bottom of any water heater, and that gunk cuts into your hot water capacity and makes the burner work harder. So the yearly anode check doubles as your yearly flush. Two jobs, one socket. Your hot showers stay hot and your heater runs the way it should.

One note on this version. It's the without-drain configuration, so the rod itself doesn't have a built in drain valve. You drain the tank through the same port before you remove it. The packaging is printed in English and French. If your Atwood heater uses the standard 1/2 inch NPT anode port, this is the rod that fits. It's not for steel tank heaters that use a larger 3/4 inch anode, so match the thread before you order.

Who's this for? Any Atwood owner who wants to get ahead of tank corrosion instead of chasing a rusty tank replacement later. First time RV owners like it because the install is genuinely simple and the payoff is easy to understand. Full timers and folks who boondock on well water like it because they're the ones who see the worst water quality, and this is the part that takes the hit for them. Keep a spare in the storage bay and you'll always have one ready at your next flush.