Common Water Heater Problems in Malaysia & How to Fix Them

In Malaysia’s tropical weather, a water heater may not feel essential year-round—until you’re met with a shockingly cold shower on a rainy day! Whether you use an instant water heater or a storage water heater, problems can arise over time due to usage, environment, or lack of maintenance. Knowing which issues are more common with your type of heater can help you identify and resolve them quickly.

Below are some of the most common water heater problems in Malaysia, categorized by heater type, along with simple troubleshooting tips.

1. Low Hot Water Pressure

More common in: Instant Water Heaters
Instant water heaters rely heavily on adequate water flow to activate the heating mechanism. Low pressure can prevent the unit from functioning or result in weak hot water output.

DIY Fix:

1. Clean the showerhead or filter.

2. Check if inlet/outlet valves are fully open.

3. If you’re living on a high-rise or upper floor, you may need a water booster pump.

4. Some instant heaters come with built-in flow sensors—if they malfunction, they may need servicing.

2. Water Heater Leaking

More common in: Storage Water Heaters
Storage heaters store hot water in a tank. Over time, internal corrosion, pressure build-up, or a cracked tank can cause leaks.

DIY Fix:

1. Turn off the power and main water supply.

2. Inspect for visible cracks or rust.

3. Tighten any loose pipe fittings or valves. If the tank itself is leaking, it usually means the unit needs to be replaced.

3. Inconsistent Water Temperature

Common in: Both Storage & Instant Water Heaters
Temperature fluctuations are often due to a faulty thermostat or heating element. In instant heaters, it may also be caused by inconsistent water flow or a malfunctioning sensor.

DIY Fix:

1. Check your home’s water flow consistency.

2. Try resetting the unit (some models have a reset button).

3. For storage heaters, a faulty thermostat or burnt-out element may need professional replacement.

4. Ensure you’re not overloading a low-capacity heater with too much usage.

4. No Hot Water at All

More common in: Storage Water Heaters
If your storage heater is not producing hot water, the heating element may have failed, or the thermostat could be malfunctioning. For instant heaters, it’s usually a power issue or insufficient water pressure to trigger the heating system.

DIY Fix:

1. Check your circuit breaker or electrical connection.
2. Make sure water pressure meets the minimum flow rate for instant heaters.
3. For storage models, the heating element may need to be replaced.
4. If you hear odd noises (like popping or hissing), it might be due to sediment buildup inside the tank.

When to Call a Professional

While minor issues like cleaning filters or resetting the thermostat can be done at home, more serious problems, such as leaks, electrical faults, or heating element failure, should be handled by a certified technician. Attempting complex repairs without the right expertise can pose safety risks and potentially damage your unit further. If your water heater is over 8–10 years old and experiencing frequent issues, it may be time to consider a replacement with a more efficient and reliable model.

If you are using Rheem products, rest assured you’re backed by a trusted brand with professional support. Find your nearest Rheem authorized dealer today to learn more about repair services, maintenance, or selecting the right water heater for your household.