Hot water is one of those simple comforts we often take for granted until it’s unavailable. Whether it’s a morning shower, doing the dishes, or washing clothes, reliable hot water makes daily life easier and more comfortable. But if you’ve just moved into a new home, returned from a holiday, or recently had maintenance carried out, you might find yourself needing to turn on the hot water system manually. The process is straightforward once you understand the basics, but it does vary depending on the type of system installed in your home.
This article will guide you through everything you need to know about safely and effectively turning on a hot water system. From identifying your system type to understanding step-by-step procedures, safety precautions, and common troubleshooting issues, you’ll gain confidence in managing this essential household task.
Understanding Different Types of Hot Water Systems
Before you reach for any switches or valves, the first step is to know what kind of hot water system you’re dealing with. Hot water systems are not all the same, and each type has its own method of operation. Broadly, they can be divided into three categories:
Electric Hot Water Systems
Electric storage hot water systems use an electric element to heat water stored in a tank. They are common in apartments and smaller homes. These systems are usually easy to operate—simply switching on the power supply is enough. However, they take time to heat a full tank of water, especially if they’ve been off for several hours or days.
Gas Hot Water Systems
Gas systems heat water using a burner at the base of the tank. They can either be storage systems or continuous flow (also known as instantaneous). With gas systems, you’ll typically need to ignite a pilot light or reset the ignition. Some modern models have automatic ignition, making the process simpler.
Solar Hot Water Systems
Solar systems use panels on the roof to absorb energy from the sun. These systems often have a booster—either electric or gas—to ensure hot water is available on cloudy days. Turning on a solar system usually means making sure the booster is active and that the circulation pump is operating correctly.
Heat Pump Hot Water Systems
A less common but increasingly popular option is the heat pump system. It works like an air conditioner in reverse, drawing heat from the air to warm the water. These systems are efficient but require electricity to run.
Knowing which type you own will guide you through the exact steps you need to follow.
Preparing to Turn On Your Hot Water System
No matter the type, it’s important to prepare properly before switching on your system. Rushing the process can cause safety hazards or damage the equipment.
- Check for leaks – Inspect around the tank, pipes, and connections. If you notice any water pooling or dripping, don’t attempt to turn on the system until it’s been repaired.
- Confirm the water supply is open – Ensure the main water valve supplying the system is turned on. Without water in the tank, switching on the system could damage the heating element.
- Inspect the power or gas source – For electric systems, confirm the power circuit is functional. For gas systems, check the gas valve and supply line. If you smell gas, do not proceed and contact a licensed technician immediately.
- Read the manufacturer’s instructions – Systems can vary, and specific guidance from your system’s manual should always take priority.
How to Turn On an Electric Hot Water System
Step 1: Locate the Switch
Most electric systems are connected to a dedicated circuit on your electrical switchboard. Look for a labelled breaker or fuse for “Hot Water” or “HWS.”
Step 2: Switch On the Circuit
Flip the breaker to the “On” position. In some cases, there may also be an isolation switch near the tank itself, which should also be switched on.
Step 3: Wait for Heating
Electric systems don’t produce instant hot water. Depending on the size of the tank, it can take anywhere from 30 minutes to several hours to reach the desired temperature.
Step 4: Test the Water
After some time has passed, turn on a hot water tap in the kitchen or bathroom. If warm water flows steadily, the system is functioning properly.
How to Turn On a Gas Hot Water System
Check the Gas Supply
Locate the gas valve, usually near the bottom of the tank. Make sure it’s in the “On” position.
Find the Pilot Light or Ignition
Older models use a pilot light that must be lit manually. You’ll find a small access panel near the base of the unit. Modern systems may have an automatic ignition switch.
Lighting the Pilot (Manual Systems)
- Turn the control knob to “Pilot.”
- Press and hold the knob down while using a long lighter or built-in igniter to light the pilot flame.
- Keep the knob pressed for about 30 seconds, then release slowly. The flame should remain lit.
- Once stable, turn the knob to the “On” position.
Using Automatic Ignition (Newer Models)
Press the ignition button while holding down the control knob. You may hear a clicking sound until the flame catches. Once lit, release and turn the knob to “On.”
Check for Operation
After lighting, the main burner should ignite once the water temperature drops below the thermostat setting. Wait 20–30 minutes before testing a hot water tap.
How to Turn On a Solar Hot Water System
Inspect the Panels and Tank
Make sure the roof panels are unobstructed and the storage tank is filled with water.
Activate the Booster
Since solar heating depends on sunlight, you’ll likely need to switch on the electric or gas booster, especially if the system has been off for a while. For electric boosters, locate the switch on the circuit board. For gas boosters, follow the same ignition steps used for gas storage systems.
Allow Time for Heating
Solar systems rely on circulation, so it may take longer for hot water to be ready. The booster will help shorten this waiting time.
Safety Considerations When Operating Hot Water Systems
Turning on a hot water system is usually straightforward, but there are safety factors to keep in mind.
- Avoid overheating – Most systems have a thermostat. Setting it too high increases energy bills and poses a scalding risk. The recommended temperature is around 60°C for storage tanks to prevent bacterial growth, but mixing valves reduce the temperature delivered to taps.
- Never operate without water – Heating an empty tank can damage the system beyond repair. Always confirm the water supply is on before activating the system.
- Gas safety – If you ever smell gas, stop immediately. Do not attempt to relight the system until a professional has inspected it.
- Electrical caution – Never tamper with internal wiring. If your system fails to turn on, call a licensed electrician.
Troubleshooting Common Issues
No Hot Water
If the system is on but no hot water is available, check whether the power or gas supply is active. Reset the breaker for electric systems or re-ignite the pilot light for gas systems.
Water Is Too Hot or Too Cold
This usually points to a thermostat issue. Thermostats can drift over time or fail. Adjusting the temperature setting may help, but if the problem persists, professional servicing is required.
Strange Noises
Popping or rumbling sounds often indicate sediment buildup in the tank. Regular maintenance, such as flushing the tank, can prevent this.
Leaks
Loose connections, faulty valves, or corrosion inside the tank may cause leaks. Small leaks can sometimes be repaired, but larger ones often require replacement of the entire unit.
When to Call a Professional
While many homeowners can turn on a system themselves, there are times when professional help is necessary. If the pilot light won’t stay lit, if breakers keep tripping, or if you notice consistent leaks, it’s safer to bring in an expert. Gas and electrical systems can be hazardous if mishandled, and licensed technicians have the right tools and training.
Maintenance Tips for Long-Term Efficiency
Turning on your system is just the first step—keeping it running smoothly is just as important. Regular maintenance extends the life of your hot water system and improves efficiency.
- Have your system serviced every two to three years.
- Drain the tank periodically to remove sediment.
- Test pressure relief valves annually.
- Keep an eye on energy usage; sudden spikes may indicate a system fault.
Conclusion
Turning on a hot water system may feel intimidating the first time, but once you understand the type of system you own and follow the proper steps, it becomes a simple, manageable task. Electric systems rely on circuit switches, gas systems require careful attention to ignition, and solar or heat pump systems need their own unique considerations. With preparation, patience, and attention to safety, you can restore hot water to your home confidently.