Quick answer
Warning signs include water pooling around the tank, rust-colored hot water, rumbling or popping noises, little or no hot water, and a relief valve that keeps discharging. A tank water heater typically lasts 10 to 15 years. A leak from the tank body usually means replacement, while many other problems can be repaired.
How long water heaters last
The U.S. Department of Energy lists the typical lifespan of a storage tank water heater at 10 to 15 years, and about 20 years for a tankless model. Rheem, a manufacturer, describes most conventional tank units as lasting around 10 years and recommends starting to plan for replacement around year 10 rather than waiting for a failure.
These are typical ranges, not guarantees. Water conditions, maintenance, and how hard the unit works all affect how long it lasts. You can usually find the manufacture date on the data label on the tank.
Warning sign 1: Water around the tank
Puddles or dampness near the heater should never be ignored. Some leaks come from loose fittings, a drain valve, or the relief valve. Water seeping from the tank body is different. Rheem notes that water pooling around the tank usually points to internal corrosion, and that replacement is typically the only safe fix.
Before assuming the heater is the source, check that the water is not coming from a nearby pipe, condensation, or the roof. A cracked inner tank typically leaks from the bottom and requires a new unit.
Warning sign 2: Rust-colored or discolored hot water
If rusty water comes out of the hot tap but not the cold, the tank may be corroding inside or the anode rod may be wearing out. Rheem notes that persistent problems of this kind usually suggest the unit is near the end of its life.
If both hot and cold water look rusty, the cause may be elsewhere in the plumbing, not the heater.
Warning sign 3: Rumbling, popping, or cracking noises
These sounds usually mean sediment has built up at the bottom of a tank, forcing the burner or element to work harder. Tankless units can whistle or hiss when scale builds up in the heat exchanger.
Noise alone does not mean the heater has to be replaced. A plumber can evaluate whether servicing the unit makes sense or whether sediment has taken too much of a toll.
Warning sign 4: Little or no hot water
Rheem lists several possible causes: sediment, failing heating elements, a faulty thermostat, or a damaged dip tube. The unit may also be too small for what the household now uses. Many of these are repairable, especially on a heater that is still within its typical lifespan.
The temperature and pressure relief valve
The temperature and pressure (TPR) relief valve is a safety device that protects the water heater and the plumbing connected to it. The International Code Council explains that when the heater, system pressure, and valve are all in good condition, the valve should not discharge. Any discharge from the relief valve points to a problem with the water distribution system, the heater, or the valve itself.
Code requires the relief valve discharge pipe to run downward by gravity, with no valves, tees, or threaded end, and to end in a visible location no more than 6 inches above the floor or a drain. Do not cap, plug, or restrict this pipe. A blocked relief valve defeats its purpose.
If the valve is dripping or running, have a plumber diagnose the cause. HomeStars notes that a valve that keeps running while closed likely needs replacing, and that a valve releasing too much pressure also calls for a professional.
What to do if your water heater is leaking
Act quickly, because even small leaks can cause rot, mold, and damage to nearby electrical equipment. These steps follow common guidance.
- Shut off the water to the heater at its cold water supply valve. If you cannot reach it safely, close the main water shutoff for the house.
- Turn off the heat source. For an electric heater, switch off the breaker. For a gas heater, close the gas valve if you can do so safely.
- Keep people and pets away, and stay out of standing water near electrical outlets or panels.
- Do not attempt to repair a leaking tank body. Call a plumber.
- If you smell gas at any point, leave the building immediately and call 911 or your gas utility from outside. Puget Sound Energy, for example, says not to flip switches, use electrical devices near the leak, or strike matches, and lists 1-888-225-5773. Pyper does not work on gas lines or gas supply; your gas utility handles those.
Repair or replace: the main factors
Age is the starting point. A heater in the 10 to 15 year range with a leaking tank is a replacement case. A younger unit with a bad element, thermostat, or valve is often worth repairing.
Other factors to weigh with a plumber:
- Where the leak is: fittings and valves can be fixed, a corroded tank cannot.
- Repair history: repeated service calls on an older unit often signal it is time to replace.
- Capacity: if hot water runs out because the household has grown, a repair will not fix the size problem.
- Efficiency: the DOE says water heating accounts for roughly 14 to 18 percent of a typical utility bill, so a more efficient replacement can matter over time.
Tank or tankless: a general comparison
According to the DOE, storage tank heaters cost less upfront and can supply several hot water uses at once, but they lose heat while idle. Tankless models are 8 to 34 percent more efficient, cost more upfront, and deliver about 2 to 5 gallons per minute, so a high-demand home may need more than one unit. Heat pump models can be 2 to 3 times more efficient than standard electric resistance heaters but need a location with enough space and a suitable temperature range.
Fuel type, venting, and available space all affect which option fits your home.
Set the temperature safely
The Washington State Department of Social and Health Services notes that at 150 degrees Fahrenheit, water can scald in about half a second, and at 140 degrees in about one second. At 120 degrees, scalding takes about four minutes. The U.S. Consumer Product Safety Commission recommends a setting of 120 degrees, which also saves energy.
When to call Pyper Plumbing
Call us if your water heater is leaking, if the relief valve keeps discharging, or if you have no hot water and want to know whether repair or replacement makes sense. We repair and replace water heaters and can help you decide based on the unit's age and condition.
We do not do gas line, electrical, or HVAC work. If you smell gas, leave and call 911 or your gas utility first. If a breaker keeps tripping, an electrician is the right call.
Common questions
How long does a water heater last?
The U.S. Department of Energy lists 10 to 15 years for storage tank water heaters and about 20 years for tankless models. Actual life depends on water quality, maintenance, and usage.
Is a leaking water heater an emergency?
Treat it as one. Shut off the cold water supply to the heater and turn off the power or gas. A leak from the tank body usually means the tank has corroded and needs to be replaced.
Why is my water heater's relief valve dripping?
The relief valve should not normally discharge. Dripping can point to high pressure in the plumbing system, a heater problem, or a worn valve. Have a plumber diagnose it, and never cap the discharge pipe.
What does a rumbling water heater mean?
Rumbling or popping usually means sediment has built up at the bottom of the tank. It often means the unit is working harder than it should. A plumber can tell you whether servicing it is worthwhile.
Sources
Facts in this guide come from the following references. Local rules and manufacturer instructions can differ, so follow your utility and your equipment manual.
- U.S. Department of Energy: Which Water Heater Is Right for You?
- Rheem: 5 Signs Your Water Heater Is Going Bad
- International Code Council: Water Heater Safety in the International Codes
- HomeStars: What to Do If Your Water Heater Is Leaking
- Washington State DSHS: How Hot Is Your Water?
- Puget Sound Energy: Natural Gas Safety
This guide is general information, not a substitute for an on-site inspection. If you smell natural gas, leave the building and call 911 or your gas utility. Pyper does not perform gas line work.
