Hot water is essential for everyday comfort—from showers to cleaning and cooking. When your electric water heater stops working or becomes inefficient, replacing it can restore convenience instantly. The good news is that installing an electric water heater is more straightforward than many people expect, especially compared to gas systems.
With the right tools, preparation, and safety steps, you can complete this project in a few hours. If you’d like to explore professional options first, check out our water heater services in Lubbock or water heater services in San Antonio.
This guide is specifically for Electrical water heaters and these steps are not recommended if you have a gas heater.
Learning About an Electric Water Heater’s Operation
An electric water heater heats up water using heating elements that are controlled by the thermostat installed on its exterior.
As opposed to gas water heaters, electric water heaters:
- Do not require any venting
- Are easier to install
- Fully depend on the electricity input only
When installing such a heater, here is what you will need:
- An electrical hook-up only
- Cold water line
Some Important Safety Tips
When preparing to install the heater, do the following:
- Switch off electricity at the breaker box
- Check for electricity using a non-contact tester
- Close the water valve
- Let the hot water cool down before draining
Water Heater: Check Size and Space
Prior to purchasing the water heater:
- Look for the label on your old water heater indicating its capacity and specifications
- Measure the size of the installation place
- Modern water heaters (particularly the ones produced post-energy efficiency standards) frequently have additional insulation and therefore are usually somewhat bigger than the older ones. Always ensure that the new model fits the designated spot.
Tools and Materials Required
Tools:
- Adjustable or pipe wrench
- Pipe cutter
- Screwdriver
- Wire cutter
- Non-contact electrical tester
- Carpenter’s level
- Soldering iron (if needed)
Materials:
- Electric water heater
- Water connectors or copper pipes
- Pipe couplings and valves
- Plumbing tape
- Wire connectors
- Expansion tank (if needed)
- Pan and drain line
- Personal protective equipment (gloves, glasses)
Step 1: Cut the Power Supply and Drain the Water Heater
- Switch off the breaker supplying power to the water heater
- Start the water from the nearest hot water tap to cool down the water inside the heater
- Close the cold water valve
Then:
- Attach a garden hose to the drain valve
- Drain the water heater either into the floor drain, bucket, or outdoors
- Leave the faucet running for faster draining.
Step 2: Detach Electrical and Plumbing Connections
After draining the tank:
- Remove the electrical cover
- Unplug the wires from the thermostat by unscrewing them
- Plumbing wise:
- Detaching hot and cold water supply pipes
- Lifting unions with the help of wrenches, if they are installed
- Cuts the soldered pipes using a pipe cutter
Moreover:
- Remove the temperature and pressure relief valve and overflow pipes
Step 3: Removing the Old Tank
Place the old unit outside its location.
Advice: The tank might be very heavy owing to sediment inside, so you need help to remove it from its place.
Then:
- Clean the location where it was installed
- Dispose of the old heater legally
Step 4: Position the New Water Heater
Position the new heater properly by:
- Ensuring at least 6 inches of clearance from the unit
- Aligning it so it can be easily accessed to control
- Leveling it using a level
- Adding shims where needed
- It is advisable to place the heater in a drain pan to collect future water leaks.
Step 5: Mount Temperature and Pressure Relief Valve
- Tape its threads with plumber’s tape
- Install it into the tank
- Tighten the valve to face down
- Install the discharge pipe for safe water release in case of pressure.
Step 6: Hook Up Water Supply Lines
Connect water supply lines by:
- Taping threads with plumber’s tape
- Installing heat trap fittings
- Ensuring proper water flow direction (look for arrows on fittings)
- Usually:
- Blue = Cold water supply
- Red = Hot water outlet
- A flexible or copper pipe may be used to connect the fittings.
- In case of soldering:
- Scour pipe ends using an emery cloth
- Use flux
- Assemble the pipes and solder.
Step 7: Filling the Tank
Before turning on electricity:
- Open the cold-water inlet valve
- Ensure the tank gets filled entirely
To expel air:
- Open the faucets inside the house
- Let water run until there’s no air
When full:
- Shut off all faucets
- Test for any leakages
Step 8: Connecting Electrical Wires
After filling the tank:
- Connect the electrical wires as per the instructions
- Fix the ground wire firmly
- Reinstall the panels
Note: Avoid switching on electricity when the tank isn’t full yet. The electrical components can be damaged.
Step 9: Adjusting Thermostat
- Adjust thermostat to the desired temperature (suggested: 120°F / ~49°C)
- Refit the covers and insulation
- Activate the circuit breaker again
- The heater starts to heat the water.
Step 10: Final Testing
Post-installation:
- Inspect all connections for leaks
- Operate the heater using hot water
- Observe the performance of the system for some time
- If everything performs fine, you have completed your installation.
Tips to Optimize Your Performance
- If needed, install a thermal expansion tank
- Regularly flush the tank to get rid of sediment buildup
- Use insulation blankets to improve efficiency
- Check your connections often
Time to Hire Professionals
Though the process of installing an electric water heater is quite easy, yet there are times when you should call in professionals:
- Electrical work needs expertise
- Pipe cutting and soldering are required
- Installation should adhere to local plumbing/electrical codes
- Difficult to install due to lack of space
- Not sure of grounding or connections
- Water leakage even after installation
Professional installation is always better.
Professional installation is always better. If you’re in this situation, our emergency plumbing services in San Antonio and emergency plumbing services in Lubbock are available 24/7
Let the experts handle it. Leaky’s Plumbing Services offers dependable, professional support for everything from small fixes to full plumbing installations. With skilled technicians and excellent service, you can count on a smooth, stress-free experience from start to finish. Call us today!