Why Is Your Water Heater Not Hot? 7 Common Reasons & How to Fix Them
- Ria
- 6 days ago
- 3 min read
Table of Contents
1. Introduction: Why Your Water Heater Isn’t Heating Properly
There’s nothing worse than stepping into a cold shower when you expect hot water from your water heater — whether it’s a Joven water heater, Panasonic water heater, or Alpha water heater. From instant electric models to storage tank systems, several issues can prevent hot water from flowing.
This guide will walk you through the 7 most common causes and how to fix them, so you’ll know what to do before calling a technician.
FAQ:
Q: Can a new water heater still fail to heat properly?
A: Yes — even new units can have settings or installation issues that affect performance.
2. Faulty Heating Element in Electric Water Heaters
Key Points
Electric water heaters rely on heating elements to warm water.
Over time, these elements can wear out or break.
This problem is common in electric instant hot water heaters and electric storage water heaters.
How to Fix
Turn off power before inspecting.
Test the heating element with a multimeter.
Replace faulty elements promptly.
FAQ:
Q: How do I know if the heating element is the issue?
A:Â Uneven heating or lukewarm water often indicates a failed element.
3. Incorrect Temperature Settings
Key Points
Some water heaters are set too low from the factory.
Lower settings are energy‑efficient but may feel too cool.
This happens in instant water heater Malaysia and tank models alike.
How to Fix
Locate thermostat settings behind access panels.
Increase to a comfortable level (usually 50–60°C).
FAQ:
Q: What’s the ideal temperature for hot showers?
A: 50–55°C is generally comfortable and safe.
4. Sediment Buildup in the Water Heater Tank
Key Points
Minerals in water can settle at the bottom of tanks.
Sediment reduces the efficiency of the heating element.
Common in storage water heater Malaysia systems.
How to Fix
Drain the tank and flush out sediment periodically.
Install a sediment filter to reduce future buildup.
FAQ:
Q: How often should I flush my water heater tank?
A:Â Once or twice a year is recommended.
5. Malfunctioning Thermostat
Key Points
The thermostat controls the temperature of your water heater.
A faulty thermostat won’t signal the element to heat properly.
This can occur on brands from Panasonic water heater with pump to electric tankless water heaters.
How to Fix
Test with a multimeter.
Replace if readings are inconsistent.
FAQ:
Q: Can I adjust the thermostat myself?
A: Only if you’re familiar with water heater wiring; otherwise call a professional.
6. Inadequate Water Pressure or Flow
Key Points
Low water pressure can prevent hot water from reaching faucets/showerheads.
Issues can stem from the water heater shower setup or household plumbing.
How to Fix
Check valves and pressure regulators.
Install a pump if needed — popular with Joven water heater with pump models.
FAQ:
Q: Why does hot water flow poorly even when heater is working?
A:Â Blocked nozzles, valves, or poor pressure can be the cause.
7. Electrical Issues or Poor Wiring
Key Points
Loose connections, faulty wiring, or tripped breakers can stop heating.
Proper water heater wiring is crucial for safe performance.
This can affect all electric models — from electric instant water heaters to electric storage water heaters.
How to Fix
Turn off power at the breaker first.
Inspect wiring for loose connections or burned components.
Consult a certified electrician for repairs.
FAQ:
Q: Is professional wiring necessary for a water heater?
A: Yes — water heater wiring should be handled by professionals due to safety concerns.
Conclusion: Quick Fixes for Better Hot Water
When your water heater is not hot, the problem often comes down to settings, buildup, or mechanical/electrical failures. Start with simple checks like thermostat settings or flushing the tank. But if the root cause is more complex — like wiring or a broken element — it’s always best to get a professional involved.
Did You Know?
Water heaters with built‑in pumps or multipoint systems are increasingly popular in Malaysian homes because they improve hot water flow and usability, especially in larger households or multi‑bathroom setups.
We provide expert house wiring services including safe water heater installation across:
Kuala Lumpur (KL)
Selangor
**Johor Bahru
Our certified electricians handle everything from wiring to installation checks — so your water heater works safely and efficiently.
👉 Contact us now for a free quote and professional service!