How to Handle a Broken Hot Water Cylinder: A Kiwi's Guide.

If your hot water cylinder has thrown in the towel, don’t stress. A busted hot water system can feel like a major inconvenience, especially when you’re staring at a cold shower or trying to boil the jug just to wash the dishes. But, as we say in New Zealand, “no worries”—with a little know-how and some professional help, you’ll be back to enjoying hot water in no time.

Step 1: Spot the Signs of Trouble

The first thing to do is identify the problem. Hot water cylinders can fail in a few different ways, but the most common signs include:

• No hot water: The most obvious one. If your water suddenly turns cold, your cylinder might be the culprit.

• Leaking water: Pooling water around the base of the cylinder is a major red flag. Small drips could point to a minor issue, but more serious leaks might mean the cylinder needs replacing.

• Strange noises: If your cylinder is making loud rumbling or banging sounds, it could be sediment build-up or another internal issue.

• Water pressure issues: A drop in hot water pressure could mean a blockage or a problem with the cylinder's plumbing.

Step 2: Temporary Fixes

While you wait for a professional, there are a few things you can do to make life easier:

• Turn off the electricity to the cylinder: If there's a leak or something seems seriously wrong, locate your cylinder’s switch or circuit breaker and turn it off to prevent further damage.

• Turn off the water to the cylinder: If there's a leak or something seems seriously wrong, try and locate your cylinder’s water inlet valve and turn it off to prevent further damage. (if you can't find it you could turn off the water to your house while you wait for the plumber to arrive.

• Boil water as a backup: For basic washing up or personal hygiene, boiling the jug can get you by until help arrives.

Step 3: Call a Professional Plumber

In New Zealand, working with hot water cylinders is something that requires expertise. While DIY might be tempting, it’s best to leave this job to the pros—especially if your cylinder is leaking or you suspect it needs to be replaced. A plumber can assess whether the issue is fixable or if it’s time to invest in a new system.

At Northside Plumbing we will always ask the following questions before sending a plumber to check for no hot water as these questions will likely save you some money.

1. Have you checked your switch to the HWC is on?

2. Have you checked your circuit breaker to the HWC is in the on position?

3. If both are on, have you called your electrical supplier to ask them if they have turned off your HWC

remotely for any reason? (this can happen if they need to divert power somewhere else in the grid for whatever reason) Most of the time (not all of the time), cold water is actually caused by an electrical issue. If we can rule out any of the issues above before sending someone to site, this will save you money for wasted labour.

When our plumber arrives onsite they can then check the valves are fine and we can organize our own electrician (unless you have your own preferred contractor) to check and possibly replace a faulty element and thermostat. We take the worry away so you will be having a hot shower in no time!

Why Hot Water Cylinders Fail

Hot water cylinders can last anywhere from 10 to 20 years, depending on how well they’re maintained. Here are a few common reasons they might fail:

1. Age: Like all appliances, hot water cylinders don’t last forever. If yours is over 10 years old, it might be nearing the end of its life.

2. Sediment build-up: Over time, minerals in the water can settle at the bottom of the tank, reducing efficiency and eventually causing damage.

3. Corrosion: Rust is another common issue, especially if the anode rod (designed to prevent corrosion) has worn out.

Step 4: Replace or Repair?

When your hot water cylinder fails, you’ll need to decide whether to repair or replace it. A plumber will help you figure out what’s best based on the age and condition of your system.

● Repair: If the cylinder is relatively new and the problem is minor (e.g., a valve replacement or small

leak), a repair might be all that’s needed.

● Replace: If the cylinder is old, corroded, or badly damaged, replacement might be the more

cost-effective solution. Modern hot water systems are more energy-efficient, meaning you could even

save on your power bill in the long run.

Step 5: Consider an Upgrade

If your cylinder does need replacing, it could be a good time to upgrade. Many Kiwis are opting for continuous flow systems like the Rinnai Infinity. These systems heat water on demand, meaning you never run out and only pay for what you use. Plus, they’re a space saver if you’re tight on room.

Step 6: Maintenance Tips

To keep your hot water cylinder in tip-top shape, there are a few things you can do:

● Regular servicing: Just like your car, a bit of regular maintenance can extend the life of your cylinder.

● Check for leaks: Keep an eye out for any signs of water around the base of your cylinder.

● Monitor your power bill: A sudden spike could be a sign your cylinder isn’t working as efficiently as it should.

Conclusion: Northside Plumbing is Here to Help

When your hot water cylinder breaks down, it can be a hassle, but it’s not the end of the world. With the right approach—and the help of a qualified plumber—you’ll have hot water flowing again soon enough.

At Northside Plumbing, we offer expert service to quickly diagnose and fix any issues with your hot water cylinder. Whether it’s a simple repair or a full replacement, our team will make sure your home stays warm and comfortable.

Don’t wait—fill out our contact form today, and we’ll be in touch to get your hot water sorted! Give us a call now, and let us take the stress out of your hot water woes.