5 Common Water Heater Installation Mistakes to Avoid

Installing a water heater is a crucial task that requires careful planning and execution. While it may seem like a simple job, homeowners often make several common mistakes during the installation process. In this guide, we will discuss the top 5 water heater installation mistakes to avoid to ensure that your water heater operates safely and efficiently for years to come.

Mistake #1: Incorrect Sizing

One of the most common mistakes homeowners make when installing a water heater is choosing the wrong size unit. A water heater that is too small may not be able to meet your household’s hot water demands, leading to cold showers and frustration. On the other hand, a water heater that is too large can lead to unnecessary energy waste and higher utility bills.

To avoid this mistake, it’s important to calculate your household’s hot water needs before purchasing a water heater. Factors such as the number of people in your household, the number of bathrooms, and your hot water usage habits should all be taken into account when determining the correct size water heater for your home.

Mistake #2: Poor Ventilation

Proper ventilation is essential for gas water heaters to operate safely and efficiently. Improper ventilation can lead to the buildup of carbon monoxide, a colorless and odorless gas that can be deadly if inhaled in large amounts.

When installing a gas water heater, it’s important to follow the manufacturer’s guidelines and local building codes regarding ventilation. This typically involves installing a vent pipe that directs exhaust gases outside of your home. Failure to properly vent a gas water heater can result in serious safety hazards, so it’s not a step to overlook.

Mistake #3: Incorrect Water Pressure

Water pressure is another important factor to consider when installing a water heater. Installing a water heater that is not compatible with your home’s water pressure can lead to leaks, damage to the unit, and inefficient operation.

Before installing a water heater, it’s important to check the water pressure in your home. If the water pressure is too high, you may need to install a pressure regulator to reduce the pressure to a safe level for your water heater. Conversely, if the water pressure is too low, you may need to install a booster pump to increase the pressure to the appropriate level.

Mistake #4: Lack of Insulation

Proper insulation is crucial for maintaining the efficiency of your water heater. Without adequate insulation, heat loss can occur, leading to higher energy bills. Insulating both the hot and cold water pipes connected to your water heater can help reduce heat loss and save energy.

When installing a water heater, be sure to insulate any exposed pipes with pipe insulation. This will help keep the water in the pipes warm and reduce the amount of heat loss as the water travels from the water heater to your faucets.

Mistake #5: Incorrect Installation Location

The location of your water heater can have a significant impact on its performance and longevity. Installing a water heater in a cold or damp area can lead to rust and corrosion, while installing it in a confined space can restrict airflow and ventilation.

When choosing a location for your water heater, it’s important to select a well-ventilated, dry area that is away from flammable materials. Additionally, you should ensure that there is enough space around the water heater for servicing and maintenance.


Avoiding these common water heater installation mistakes can help ensure that your water heater operates safely and efficiently for years to come. By taking the time to properly plan and execute your water heater installation, you can avoid costly repairs and potential safety hazards. If you’re unsure about how to install your water heater correctly, it’s always best to consult a professional plumber to ensure that the job is done right.

For reliable and professional plumbing services in Roswell, GA, contact Plumber Roswell GA. Our team is ready to assist you with all your plumbing needs.

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