The water heater is one of the
hardest-working appliances in your home. It heats and stores or heats on demand
the water used for bathing, washing dishes, doing laundry, and every other hot
water need in the household. When it stops working properly or reaches the end
of its useful life, replacing it is not simply a matter of swapping one unit
for another. A proper water heater installation involves gas line or electrical
connections, water supply and pressure relief connections, venting
requirements, and local permit compliance. Done incorrectly, a water heater
installation can create gas leaks, carbon monoxide risks, flooding, or fire
hazards.
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A licensed plumber handles every aspect of water heater installation correctly, from sizing the unit appropriately for your household to making all connections safely and testing the system thoroughly before leaving your home.
Types of Water Heaters Available for Residential Installation
Traditional Storage Tank Water Heaters
The traditional storage tank water
heater is the most common type found in American homes. It works by
continuously heating a large volume of water, typically thirty to eighty
gallons, and keeping it at a set temperature so hot water is always available on
demand. Gas storage tank heaters use a burner at the bottom of the tank while
electric models use heating elements inside the tank. Storage tank heaters are
familiar, relatively inexpensive to purchase, and straightforward to install.
Their main drawback is standby heat loss, where energy is continuously used to
keep the stored water hot even when no hot water is being used.
The average lifespan of a traditional storage tank water heater is eight to twelve years. After that point, efficiency declines and the risk of leaks increases as the interior of the tank corrodes.
Tankless On Demand Water Heaters
Tankless water heaters, also
called on demand or instantaneous water heaters, heat water only when a hot
water tap is opened rather than storing a large volume of heated water
continuously. Cold water flows through the unit and is heated instantly by a powerful
gas burner or electric heating element as it passes through. Because there is
no stored water to keep hot, tankless units eliminate standby heat loss
entirely and can reduce water heating energy costs significantly.
Tankless water heaters have a longer lifespan than storage tank units, typically twenty years or more with proper maintenance. They also take up significantly less space since they are mounted on a wall rather than standing on the floor. The trade off is a higher upfront purchase and installation cost, and in some homes the existing gas line or electrical service may need to be upgraded to support the higher demand of a tankless unit.
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Heat Pump Water Heaters
Heat pump water heaters, sometimes called hybrid water heaters, use electricity to move heat from the surrounding air into the water rather than generating heat directly. They are significantly more energy efficient than traditional electric storage tank heaters, using roughly two thirds less electricity to heat the same amount of water. They work best in spaces where the ambient air temperature stays above fifty degrees consistently, such as a basement, utility room, or garage. Heat pump water heaters are eligible for federal tax credits in the United States, which can offset the higher upfront cost.
Solar Water Heaters
Solar water heaters use rooftop solar collectors to capture heat from sunlight and transfer it to your water supply. They require a backup heating system for periods of low sunlight but can dramatically reduce water heating costs for homeowners in appropriate climates. They have higher installation costs but very low operating costs over their lifespan. Installation requires both a plumber and a solar specialist working together.
What the Water Heater Installation Process Involves
Assessing the Right Size and Type for Your Household
Before any installation begins, the right size unit must be selected. A water heater that is too small for the household runs out of hot water regularly. One that is too large wastes energy heating more water than needed. For storage tank heaters, sizing is based on the number of people in the household and peak hour demand. For tankless heaters, sizing is based on flow rate requirements and the temperature rise needed from incoming cold water to the desired output temperature.
Removing the Old Water Heater Safely
The old unit must be disconnected from the gas or electrical supply and from the water supply lines before it can be removed. For gas heaters this requires properly capping the gas line and ensuring there is no residual gas in the line before work continues. The tank must be drained completely before it can be moved, and older units can be very heavy. Proper disposal of the old unit is also part of the process.
Installing the New Unit and Making All Connections
The new heater is positioned and leveled, then connected to the cold water supply inlet and hot water outlet. The pressure relief valve is installed and connected to a drain line. For gas units the gas line connection is made and tested for leaks. For electric units the electrical connections are made at the appropriate circuit. Venting is installed or modified as needed. The unit is filled with water, checked for any leaks at all connections, and then fired up or energized for the first time to verify proper operation.
Signs Your Water Heater Needs Replacement
•
Unit is ten years old or
older and showing reduced efficiency
•
Rust colored or muddy water
coming from hot water taps
•
Rumbling, popping, or
banging noises coming from the tank
•
Water pooling around the
base of the unit
•
Inconsistent water
temperature or insufficient hot water
•
Visible corrosion or rust
on the tank exterior
• Frequent repairs needed in a short period of time
Water Heater Maintenance Tips to Extend Unit Lifespan
Annual flushing of the tank
removes sediment that accumulates at the bottom over time. Sediment buildup
reduces efficiency, causes the rumbling noises many homeowners notice in aging
units, and accelerates corrosion of the tank interior. Flushing the tank once a
year is one of the simplest and most effective things a homeowner can do to
extend the life of a storage tank water heater.
The anode rod is a sacrificial
metal rod inside the tank that attracts corrosive elements in the water,
protecting the tank walls from rust. It slowly dissolves over time and should
be inspected every two to three years and replaced when significantly depleted.
Replacing the anode rod on schedule can add years to the life of the tank.
Setting the temperature to 120 degrees Fahrenheit is sufficient for most households, safe from scalding, and reduces energy use compared to higher settings. Have a licensed plumber perform an annual inspection to check the pressure relief valve, all connections, and the overall condition of the unit.
If your water heater is
approaching the end of its lifespan or showing any of the warning signs above,
consulting a licensed plumber about your replacement options before it fails
completely is the most practical approach. An unexpected failure can leave a
household without hot water and cause water damage if the tank fails while you
are away from home.