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No hot water in the house almost always points to the water heater, not your faucets. On a gas unit, the pilot light or gas supply is the usual cause. On an electric unit, it is a tripped breaker or reset button. On a tankless unit, look for an error code. Most checks take ten minutes.
This guide walks you through safe checks for gas, electric and tankless heaters, and tells you when to stop and call. If you would rather have a pro handle it, our emergency hot water repair team works across High Point and the Triad. Call (336) 462-1080 and a real person answers, day or night.
Key Takeaways
- Start with the simple stuff. A tripped breaker, a pilot that went out or a closed valve causes a lot of cold showers.
- Gas smell means get out. Leave the house first, then call your gas utility from outside. Do not try to relight anything.
- Electric heaters have a reset button. If it keeps tripping, a thermostat or element has likely failed.
- Tankless units tell you what is wrong. Write down the error code before you reset the unit.
- Water on the floor changes the plan. A leaking tank usually means replacement, not repair.
Why Is There No Hot Water in the House?
When every tap runs cold, the problem is upstream of all of them. That means the water heater, its fuel or power, or the valve that feeds it. One cold faucet with hot water everywhere else is a different problem, usually a fixture cartridge or mixing valve.
Before you touch anything, look and listen. These clues narrow things down fast.
- The pilot window on a gas heater is dark
- The breaker for an electric heater sits in the middle or off position
- A tankless unit shows a flashing code or a blank screen
- Water is pooled around the base of the tank
- You smell gas or a rotten egg odor near the heater
- Hot water comes out lukewarm and runs out in minutes
- The heater made popping or rumbling sounds before it quit
Water on the floor is its own problem. Our water heater leak guide covers where leaks come from and what to do right away.
Common Causes by Heater Type
| What you notice | Gas tank | Electric tank | Tankless |
|---|---|---|---|
| No hot water at all | Pilot out, gas valve off, bad thermocouple | Tripped breaker or high-limit reset | Error code, no gas, power loss |
| Lukewarm water only | Thermostat set low, sediment | One failed element | Scale buildup, flow too low |
| Runs out fast | Sediment, broken dip tube | Bad lower element | Too many fixtures at once |
| Safe to check yourself | Pilot window and gas valve | Breaker and reset button | Code, power and gas valve |
| Call a plumber | Gas smell, pilot will not stay lit | Reset trips again | Repeat codes, ignition failure |
Quick Checks to Try First
These steps are safe for most homeowners and fix a good share of cold-water calls. Go in order and stop if anything seems off.
- Check for a gas smell. If you smell gas, skip every other step and leave the house.
- Confirm the problem is everywhere. Run hot water at a kitchen faucet and a shower for a full minute each.
- Look at the cold supply valve. The valve on the cold line above the heater should be fully open.
- Check the thermostat dial. Someone may have bumped it to vacation or low. The CPSC scald prevention guidance suggests a setting of 120 degrees Fahrenheit.
- Check power or fuel. Look at the breaker panel for electric units, the gas valve for gas units, or the propane tank gauge if your home runs on propane.
- Look for water on the floor. A puddle under the tank means call a plumber.
Many rural homes around Oak Ridge, Stokesdale and Trinity run on propane. An empty tank shuts the heater down just like a gas outage.
Gas Water Heater Troubleshooting
Gas tanks heat water with a burner under the tank. If you have no hot water in the house and a gas heater, check these three things.
The Pilot Light Went Out
Older gas heaters have a standing pilot you can see through a small window near the bottom. If it is dark, the relighting steps are printed on the label on the side of the tank. Follow them exactly and never use a match near the burner on a sealed unit.
Many newer heaters use electronic ignition and have no pilot to relight. On those, a blinking status light on the gas valve usually tells you the fault.
The Pilot Will Not Stay Lit
If the pilot lights and then goes out when you let go of the knob, the thermocouple or flame sensor is often worn out. That part tells the gas valve the pilot is burning. A plumber can test and replace it in one visit.
The Gas Supply Is Off
The gas shutoff on the line to the heater should run parallel with the pipe. If another gas appliance in the house also stopped working, the problem is probably the supply, not the heater.
Electric Water Heater Troubleshooting
Electric tanks use two heating elements, each controlled by its own thermostat. They run on a dedicated 240-volt circuit. Always shut off the breaker before you open any panel on the tank.
Check the Breaker
Find the double breaker labeled for the water heater. If it is tripped, push it fully off, then back on. Give the tank an hour or more to reheat before you test the water.
Press the High-Limit Reset
Most electric heaters have a red reset button behind the upper access panel. It trips when water gets too hot. With the power off, remove the cover and insulation, then press the button firmly until it clicks. Put everything back before you turn the power on.
When the Reset Keeps Tripping
A reset that trips again within a day or two is a warning. A stuck thermostat or a shorted element is the usual cause, and both are repairable. If your water is only warm and runs out fast, one element has likely failed. Our post on slow, lukewarm hot water explains how to tell a heater problem from a long pipe run.
Still no hot water after these checks? Call (336) 462-1080. We will tell you what we found and give you the price before any work starts, and there is no charge if you decline the quote.
Tankless Water Heater Troubleshooting
Tankless units heat water only when a tap opens. When they quit, they usually show a code on the front panel. Write it down, then check the manual or the label inside the cover.
- Power. Gas tankless units still need electricity for the controls and fan. A tripped breaker or unplugged cord stops them cold.
- Gas supply. Make sure the gas valve is open and other gas appliances are working.
- Flow too low. Tankless heaters need a minimum flow to fire. A clogged aerator or a nearly closed tap may not be enough.
- Scale buildup. Hard water coats the heat exchanger and can trigger overheat codes. Homes on private wells in the Triad tend to see this sooner.
- Cold weather. Hard winter freezes can affect units with outdoor venting or exposed lines.
Turning the unit off and back on can clear a one-time code. If the same code returns, the unit needs service or a descaling flush, not more resets. We service Navien and Rinnai tankless units, along with AO Smith, Rheem, Bradford White and State tanks.
When Is No Hot Water a Safety Problem?
Most cold-water calls are just an inconvenience. A few are true emergencies.
If You Smell Gas, Leave First
Natural gas has an added rotten egg smell so you can catch a leak. According to state emergency gas guidance, you should not use lighters, phones, light switches or appliances. Leave the house with everyone, including pets. From a spot where you no longer smell gas, call your gas utility. Call 911 if there is immediate danger.
Do not try to relight the pilot or shut the gas valve yourself. Once the utility clears the leak, a licensed plumber can repair the heater or gas line.
Other Signs to Stop and Call
- Scorch marks or soot around the burner door or vent
- Water spraying from the relief valve on the side of the tank
- A carbon monoxide alarm going off
- Rust-colored water along with a leaking tank
Repair or Replace?
Thermocouples, elements, thermostats and gas valves are repairable parts. A leaking tank is not. If your tank is leaking or past 10 to 12 years old, our water heater replacement options page explains how we size and install a new unit. Typical national ranges for a new tank installed run from about $1,200 to $3,500, and your actual price is confirmed upfront.
No Hot Water in House FAQs
Why does my house suddenly have no hot water?
A sudden loss of hot water usually means the heater lost fuel or power. On gas units, the pilot went out or the gas supply was interrupted. On electric units, a breaker or the high-limit reset tripped. Tankless units show an error code that points to the cause.
Why would my hot water not work but my cold water does?
Cold water comes straight from your supply line, while hot water must pass through the heater first. If cold works and hot does not, the heater is not heating or its valve is closed. Check the cold inlet valve, the breaker or pilot, and the thermostat setting.
How do you reset your hot water heater?
For an electric heater, turn off the breaker, remove the upper access panel and insulation, and press the red reset button until it clicks. Replace the cover and restore power. Gas heaters do not have a reset button. Relight the pilot following the label on the tank instead.
How long does it take for a hot water heater to reset?
The reset itself is instant, but reheating takes time. A full electric tank usually needs one to two hours to reach temperature. A gas tank heats faster, often within an hour. A tankless unit makes hot water within seconds once it fires again.
Get Your Hot Water Back Today
No hot water in the house is usually one small part away from a fix. Check the breaker, the pilot and the valves first. If it keeps coming back, or you ever smell gas, let a licensed plumber handle it.
All-Star Plumbing of the Triad has been family owned in High Point since 2007. We serve homes from our Greensboro plumbing crew to Winston-Salem and Kernersville, with upfront pricing you approve first. Call (336) 462-1080 any hour. If we can’t fix it, you don’t pay.
All Star Plumbing
4003 North Main Street, High Point, NC 27265
Phone: (336) 462-1080
Hours: Open 24/7
NC Plumbing License #15130
