A water heater fails in slow motion more often than it dies all at once. The water runs lukewarm for a week, the tank pops and rumbles, or a rust stain spreads across the basement floor. Then one morning the shower never warms up. Describing the fuel type, the age of the unit, and where the water is appearing helps a local professional sort a small repair from a replacement conversation.
Call now
- Water is pooling around the base of the tank or running from the body of the unit.
- You smell gas near the heater, see soot or scorch marks, or the breaker trips when it runs.
- The temperature-relief valve is discharging and will not stop, or the hot water is scalding.
Can usually wait
- The water is warm but not hot, and the tank and floor stay dry.
- The pilot goes out now and then and relights cleanly, with no gas smell.
- The tank rumbles or pops, but hot water still arrives and nothing leaks.
Have this ready
- Your ZIP code and the fuel type: natural gas, propane, electric, or heat pump.
- The age of the unit and the model number from the rating label.
- Whether the leak comes from the tank, a fitting, or the relief valve, and whether the water is off.
What the desk hears most
- 01
No hot water at all
On a gas unit, check the pilot or igniter and the gas control knob. On electric, check the breaker and whether the reset button has tripped. If the burner or element runs but the water stays cold, the dip tube, thermostat, or control board is the next place to look.
- 02
Water at the base of the tank
A puddle can come from a loose fitting, a weeping relief valve, condensation, or a hole in the tank itself. Dry the floor, lay down a paper towel, and watch where the first drop lands. A leak from the tank body is a different call than a leak from the pipes above it.
- 03
A pilot that will not stay lit
The thermocouple or thermopile may be dirty or failing, the orifice may be clogged, or the venting may not be drawing properly. A sealed-combustion unit has its own intake and exhaust path. If you smell gas at any point, stop and call the utility before troubleshooting further.
- 04
Rusty or smelly hot water
Rust that appears only on the hot side often points to the anode rod or the inside of the tank. A sulfur smell can come from the anode, the water supply, or bacteria in a neglected tank. Cold water that is also discolored is a different, supply-side issue.
- 05
Replacement questions
Tank or tankless, gas or electric, same size or more capacity: the answers depend on how the house uses hot water, where the unit sits, and what the venting and electrical service can support. A replacement is also the moment to check the pan, shutoffs, and expansion tank.
Call now or wait?
The honest answer depends on whether the problem is contained and whether the house is safe. Use these two lists as a starting point, then call and describe the specifics.
Call now
- Tank leaking from the bodyShut off the cold inlet and the gas valve or breaker, then call. Do not keep firing a leaking tank. If the valve will not close, say so on the call; that changes what can be done safely.
- Gas or exhaust smellLeave the building and call the gas utility or 911 from outside. Do not flip switches, light anything, or use a phone near the unit. A water heater visit is not the first response to a gas smell or a carbon monoxide alarm.
- Relief valve dischargingThe valve is doing its job, but continuous discharge can mean high pressure or a failed valve. Shut off the heat source and the water if you can, and do not cap or plug the valve to stop it.
- Water near electrical partsIf water is touching the junction box, breaker panel, or wiring, stay out of the puddle. Shut off the breaker only if you can reach it without standing in water, then call.
Can usually wait
- Lukewarm water, no leakNote whether the temperature dropped suddenly or faded over weeks, and whether the shower or the sink is worse. A failing element, thermostat, or dip tube can be scheduled rather than treated as an emergency.
- An occasional pilot outageIf the pilot relights from a safe distance and the unit runs normally afterward, a normal appointment is reasonable. Repeated outages, a yellow flame, or any exhaust smell move it to the urgent list.
- Rumbling and poppingSediment on the tank bottom traps water and makes noise when the burner runs. It is hard on the tank but not an immediate hazard. Ask about a flush and whether the unit is near the end of its practical life.
- Rusty hot water onlyA failing anode rod is the usual suspect. It is worth fixing before the tank itself starts to leak. If the rust is heavy or the tank is old, ask whether repair still makes sense.
Before you dial: the 60-second prep
You do not need a diagnosis. You need enough detail for the desk to route the call and for the pro to arrive with the right questions.
- Write down the fuel type and the model number from the rating label.
- Find the cold-water shutoff and the gas valve or breaker for the unit.
- Photograph the leak, the label, and the pipes above the tank.
- Note the age of the unit and whether it has ever been flushed.
- Clear a path to the heater and move anything water could ruin.
- Check whether the leak is steady or only appears when the burner runs.
What happens when you call
You describe the heater
The call team asks the fuel type, the age, what the water is doing, and where the leak appears. Whether the water is off and whether the unit is still running matter as much as the brand.
The desk routes the call
Your city, the fuel type, and whether the job is a repair or a replacement determine which independent local water heater professional receives the call.
You confirm the visit
The professional explains availability, the diagnostic approach, and any visit charge before work begins. Ask whether the old unit is removed and whether a permit is needed.
What changes the job here
Housing age, weather, water, soil, and foundation type all change how a water heaters problem behaves. These are the local factors worth mentioning on the call.
Hard water and sediment
In hard-water regions, scale settles on the tank bottom and the heating element. The unit runs longer, pops louder, and loses capacity before it fails outright. A flush schedule matters more here than in soft-water areas.
Cold basements and garages
Units in unheated spaces lose efficiency and face freeze risk on the supply lines. Combustion air and venting also behave differently in a tight basement or an attached garage. Tell the desk where the heater sits.
Older homes and chimney venting
An atmospheric-vent water heater tied into an old masonry chimney can backdraft if the liner or flue is wrong. That is a carbon monoxide concern, not just an efficiency one. A replacement may need a liner or a different vent path.
Tight closets and code clearances
Newer high-efficiency and tankless units need specific clearances, condensate handling, and sometimes a larger gas line or electrical circuit. A closet that fit the old tank may not fit the replacement without changes.
Questions worth asking the pro
Ask before you authorize work. A good professional will answer plainly, including the parts that are still uncertain.
- Is the tank itself leaking, or is it a fitting or the relief valve?
- Should I repair this unit or put the money toward a replacement?
- If we replace it, what size and recovery rate fit this house?
- Does the new unit need a different vent, electrical circuit, or gas line?
- Will you pull the permit and arrange the inspection?
- What happens to the old tank, and who removes it?