Top 6 Habits That Can Damage Your Water Heater

Hot water is a cornerstone of modern comfort in many New Zealand homes. From taking a warm shower on a crisp morning to tackling piles of dishes after a family meal, water heaters play a crucial role in daily life. However, this essential appliance is often taken for granted until something goes wrong.

A water heater, like any other household system, requires proper care and attention to function efficiently. Unfortunately, some habits that we may have developed over the years and assume to be harmless can actually cause unnecessary strain and reduce its lifespan. The good news is that most of these damaging habits can be easily avoided with a little knowledge and proactive maintenance.

Now, let’s explore the most common habits that could be harming your water heater so that you can make the necessary changes:

1. Diagnosing Problems and Doing Complex Repairs Yourself

Many people believe they can save money by diagnosing and fixing water heater problems on their own. While it might seem like a simple DIY task, water heaters are complex appliances that require a specific understanding of electrical, plumbing, and heating systems. Misdiagnosing a problem can lead to unintended damage, and improper repairs can result in safety hazards like electric shocks, gas leaks, or water damage to your property.

If you suspect that your water heater has a problem, it’s better to consult a licensed plumber or technician. They can ensure repairs are carried out safely and correctly, as well as identify underlying issues that you might miss to prevent future breakdowns. If you reside in the Otago area, you can contact Mains Plumbers to hire professional plumbers Dunedin families have relied on for years.

2. Using an Outdated Water Heater

While it’s not a habit per se, using an outdated water heater can cause plenty of issues. Over time, water heaters often become inefficient. Their components may wear out, leading to reduced heating capacity, higher energy bills, or leaks. In some cases, older units can even pose safety risks, such as overheating or sudden failures. Relying on a water heater that has outlived its lifespan also means you’re missing out on the energy-saving benefits of modern technology.

Most water heaters typically last about 10 to 15 years, depending on the model and frequency of maintenance. If your unit is nearing the end of its lifespan, it’s a good idea to invest in a replacement. Even if you haven’t maximised the lifespan yet, you may also want to consider getting a modern water heater if the old one is experiencing issues more frequently. With a new unit that’s more energy-efficient and environmentally friendly, you can save on electricity bills and have more peace of mind that you’ll have continuous access to hot water. 

3. Setting the Temperature Too High

Some homeowners believe that cranking up the water heater to the hottest temperature ensures a constant supply of hot water. However, setting the temperature too high can cause unnecessary wear and tear on the unit. It also increases energy consumption.

As a preventive strategy, set your water heater’s thermostat at around 60°C. It’s hot enough to kill harmful bacteria while still being safe and energy-efficient. If you’re unsure how to adjust the temperature, consult your water heater’s manual or ask a professional to help.

4. Skipping Routine Flushing



New Zealand’s water supply varies in mineral content depending on the region, which means sediment build-up in water heaters is a common issue in some areas. Minerals like calcium and magnesium can settle at the bottom of the tank over time, forming a thick layer of sediment. This reduces the water heater’s efficiency, increases energy usage, and can even damage the heating elements or tank lining.

To remove sediment and keep the system running efficiently, flush your water heater regularly. Aim to flush the tank once a year or more often if you live in an area with hard water. You can do this task yourself, but if you’ve put off flushing for a while, you might need some help from professional plumbers.

5. Overloading Your Water Heater

Using more hot water than your heater can supply is another habit that can cause long-term damage. For instance, running multiple showers, dishwashers, and washing machines at the same time can overload the system, which forces it to work harder than it’s designed to. This strain can lead to overheating or a reduced lifespan.

If you want to keep using your water heater, make sure it’s appropriately sized for your household’s needs. In case your family has grown or your water usage has increased, consider upgrading to a larger tank or switching to a continuous-flow water heater. These systems can provide hot water on demand without the risk of overloading.

6. Ignoring Signs of Trouble

Many homeowners ignore early warning signs of water heater problems, thinking they’re minor issues that don’t require immediate attention. However, signs like rusty water, fluctuating temperatures, strange noises, or water pooling near the tank often indicate serious underlying problems. If left unaddressed, these issues can lead to costly repairs or even total system failure.

So, pay attention to any changes in your water heater’s performance. Rusty water might signal internal corrosion, while unusual noises could indicate sediment build-up. Address these signs ASAP to prevent further damage and save yourself money in the long run.

Your water heater is a vital part of your home, and taking good care of it ensures you have constant access to hot water while avoiding expensive repairs or replacements. This also includes being aware of and avoiding habits that may cause damage.

If you’re unsure about the condition of your water heater or need professional advice, don’t wait until a small issue becomes a costly problem. Contact Mains Plumbers today and schedule an inspection or discuss upgrading to a more efficient water heater. We also offer emergency plumbing services for immediate concerns. Remember, a little proactive care can go a long way toward ensuring your water heating system remains functional year-round.