A hot water heater is an important part of your home’s plumbing system. It provides hot water to all the fixtures and appliances connected to it. But if your hot water heater is under too much pressure, it can cause problems like leaks and even explosions. So what causes too much pressure in a hot water heater, and how can you avoid it? Let’s take a closer look.
How a Hot Water Heater Works
How Stuff Works explains that a hot water heater works by using electricity, gas, or both to heat water that is stored in a tank. The tank is typically made of steel and is insulated with either fiberglass or foam insulation to help keep the heat in. Inside the tank is a heating element that uses the energy source (electricity, gas) to heat up the cold water in the tank until it reaches a preset temperature. A thermostat monitors the temperature of the water and signals the heating element when it needs to be turned on or off.
When heated, warmer water rises to the top of the tank while cooler water drops to the bottom, allowing for consistent temperatures throughout—this process is known as convection. As warm water is drawn from the tap, more cold water enters at the bottom of the tank and is heated up by the heating element. At any given time, there will be a mix of hot and cold water inside the tank until all of it reaches its desired temperature.
Common Causes of High Pressure In A Hot Water Heater
The Spruce states that high pressure in a hot water heater can be caused by several factors, including:
Excessive Pressure Buildup
The most common cause of high pressure is the buildup of steam or air within the water heater tank. This can happen when the heat exchanger becomes blocked with mineral buildup or sediment, preventing heated water from properly releasing steam or air.
This can lead to increased pressure and water temperature levels, which are dangerous. Inadequate home ventilation can also contribute to higher-than-normal pressure. In some cases, pressure buildup can happen alongside ignition or burner issues commonly found in a gas water heater not working.
Mineral Deposits
Naturally occurring minerals like calcium and magnesium can build up on the walls of your tank over time. This sediment buildup reduces the efficiency of your hot water system and can cause pressure buildup. These minerals can build up on the walls of your hot water tank, which can reduce its efficiency and lead to pressure buildup over time.
To prevent this from happening, make sure you regularly flush out your tank to get rid of any sediment or mineral deposits that have built up over time. This will help keep your tank running efficiently and without any issues due to excessive pressure buildup.
You may want to consider installing a whole-house filter system for your home since this will help reduce the amount of minerals that are present in your water supply.
Temperature Settings
Setting your thermostat too high (above 120°F) can result in an increase in internal pressure levels. This happens because, as the water heats, it expands, a process known as thermal expansion.
If the water heats to an excessively high temperature, it can lead to pressure spikes and cause leaks. Incorrect temperature settings can also mimic symptoms of a gas water heater not heating, making it important to verify both heat and pressure cycles.
A faulty pressure relief valve or a pressure release valve that is improperly installed can also contribute to pressure issues.
Signs of High Pressure In A Hot Water Heater
Recognizing the signs of high pressure is important for avoiding serious consequences. One of the most common signs is a loud or unusual noise coming from the water heater. This could indicate that pressure builds inside and needs to be released.
Sometimes pressure problems appear alongside temperature inconsistencies, such as a new hot water heater not getting hot despite proper settings.
Other signs include:
- Uneven heating
- Leaking or corrosion around the tank
- Hissing or bubbling noises
- Rust-colored water coming from faucets or showerheads
- The pressure relief valve opens, releasing water or steam.
Consequences of High Pressure
Operating a hot water heater with too much pressure is dangerous.
- Burst pipes/water damage. The high pressure can cause pipes to burst and water to enter areas where it would not normally be found, such as walls, ceilings, and floors, resulting in costly repairs. In extreme cases, these types of events can sometimes result in the flooding of an entire home or building.
- Worse issues in connected systems. High pressure will worsen any existing faults or weaknesses in pipes and valves by forcing them open when they should have stayed closed or vice versa.
- Damage to the tank. High pressure can cause damage to the heating elements within a hot water heater as well as its tank. High pressure increases the temperature of the water, which can damage temperature-sensitive materials within the heater.
- High water bills. Excessive pressure can lead to expensive water bills due to wastage from leaks caused by faulty parts struggling under force from unbalanced plumbing systems.
- Environmental hazard. These issues are not only costly but also an environmental hazard. If not addressed, they can lead to dirty runoff entering natural waterways and ecosystems, which can be avoided through proper maintenance practices.
- Risk of physical injury. Ignoring high pressure can have severe consequences for people’s safety due to a potential lack of hot water supply or sudden scalding during showering. A faulty valve could result in a dangerous buildup of pressurized steam that could lead to an explosion or a similar type of incident.
What to Do if You Suspect High Pressure
If you suspect high pressure in your hot water heater, it is important to take safety precautions and take action immediately.
First, turn off the power source to the hot water heater. This will help prevent any further damage or risk of an explosion due to high pressure. If you are unable to locate the power source, contact a licensed electrician or plumber who can assist you with this task.
Next, inspect the temperature and pressure relief valve (T&P) on the side of the tank. If it appears to be open or leaking, this is a sign that there is too much pressure inside the tank and it needs attention. In this case, it is important to shut off the cold water supply valve that feeds into the hot water tank as well as turn off any appliances connected to hot water lines.
If, after releasing some of the built-up steam and water pressure from your hot water heater, there is still high pressure present, then you may need to adjust your thermostat setting. You should turn down your thermostat setting until it stabilizes at a lower temperature, typically between 120 and 140 degrees Fahrenheit, which is sufficient for most household needs.
As always, be sure to exercise caution when changing settings near electrical components, as you don’t want to put yourself or others at risk of electrocution or injury due to improper use of electrical appliances. It is also recommended that you contact a certified plumber who can assess the situation and determine how best to address it. If the issue persists after basic adjustments, it may indicate a deeper mechanical fault that requires professional water heater repair.
Proper Maintenance to Prevent High Pressure
To prevent any possible danger from developing due to high pressure and an overheated hot water heater, regular maintenance and early troubleshooting of water heater problems should always be performed. This includes checking all pipes for leaks or cracks every few months, as well as flushing out sediment buildup from the tank annually.
If anything seems wrong during either of these checkups, then you should have a professional look into it right away. It’s also important to make sure that you are using the proper size expansion tank with your unit so that the system isn’t overloaded with too much pressure – this can lead to an eventual failure of the system if left unchecked and can cause great harm if not addressed promptly.
At Intown Plumbing, our licensed plumbers are experienced in diagnosing and fixing hot water heater issues, including those related to high pressure. We proudly serve Rockwall, TX, Dallas, TX, Plano, TX, and throughout the Dallas-Fort Worth Metroplex and surrounding areas.
Don’t risk the safety of your home and family by ignoring the signs of high pressure in your hot water heater.
