Turning on the shower and getting nothing but cold water is one of the fastest ways to ruin a morning. The good news: when there is no hot water in house taps and showers, the cause is usually one of a short list of problems, and several of them take only minutes to check. A pilot light that blew out, a tripped breaker or a reset button that popped can all leave a perfectly healthy tank cold.
This guide walks you through how to troubleshoot no hot water in house plumbing on gas and electric tank water heaters, which fixes are safe to try yourself, what repairs typically cost and when it makes more sense to replace the heater. It is written for homeowners in Los Angeles, Orange County and the surrounding communities.
What This Guide Covers
- First checks: one faucet or the whole house?
- Gas water heater causes
- Electric water heater causes
- Some hot water, but not enough
- Repair costs
- Repair or replace?
- When to stop and call a professional
- Frequently asked questions
First checks when there is no hot water in house fixtures
Before you open any panels, figure out how widespread the no hot water in house problem is. The answer points you toward the right part of the system.
Is it one faucet or every faucet?
Run hot water at the kitchen sink, a bathroom sink and a shower. If only one fixture runs cold, the water heater is probably fine. A single cold shower often points to a worn shower cartridge or a mixing valve set too far toward cold, and a single cold faucet can be a clogged aerator or a faulty cartridge. If every fixture runs cold, you have a true no hot water in house situation and the problem is at the water heater itself.
Is the water heater getting fuel or power?
Next, identify your heater type, because no hot water in house causes differ for gas and electric tanks. A gas tank has a gas line, a control valve near the bottom and a metal vent pipe on top. An electric tank has a thick electrical cable entering a junction box on top and no vent. Then confirm the basics:
- Gas: Are other gas appliances, such as the stove, working? Is the gas valve on the supply line parallel to the pipe (open)?
- Electric: Is the water heater breaker tripped or sitting halfway between on and off?
- Both: Is the temperature dial still where you left it? It is easy to bump it to “Vacation” or the lowest setting during cleaning.
Is there water around the tank?
Check the floor and drain pan. A leaking tank may be near the end of its life, so see the repair-or-replace section below.
No hot water in house with a gas water heater
When a gas tank heater stops producing heat and you have no hot water in house showers or sinks, these are the usual suspects.
The pilot light is out
On many standing-pilot models, a small window or access cover near the bottom of the tank lets you see the pilot flame. If there is no flame, the burner cannot light and the tank will slowly go cold, one of the most common reasons for no hot water in house plumbing. SoCalGas notes that a pilot light can go out by accident and suggests consulting the owner’s manual for relighting instructions or contacting the utility to schedule an appliance appointment.
A.O. Smith’s relighting guidance follows the same basic pattern: turn the control knob to “Off,” wait at least 10 minutes for any gas to dissipate, set it to “Pilot,” hold the knob in while lighting, then confirm the flame stays lit before turning the knob to “On.” Steps vary by model, so follow the label on your own heater. Never try to relight anything if you smell gas.
The pilot will not stay lit
If the pilot lights but goes out as soon as you release the knob, the thermocouple (or thermopile on some models) is a likely cause. This small sensor tells the gas valve that a flame is present. When it is dirty, loose or worn out, the valve shuts off the gas as a safety measure. According to A.O. Smith, drafts, restricted combustion air and kinked or clogged gas tubes can also keep a pilot from staying lit. Thermocouple replacement is a common, inexpensive repair, but it involves the gas control, so most homeowners are better off having a licensed plumber handle it.
Gas supply or control valve problems
If the pilot is lit but the main burner never fires, the gas control valve or its thermostat may have failed. Low gas pressure from the meter or a problem in the supply line can cause similar symptoms. These are not DIY repairs. A licensed plumber can test the valve, the burner and the supply line safely.
Electric water heater causes
Electric tank heaters have no flame, so troubleshooting no hot water in house fixtures with an electric heater focuses on power, the safety cutoff and the heating elements.
A tripped breaker
A tripped breaker is the simplest explanation for no hot water in house taps on an electric heater, so check the panel first. If the breaker for the water heater has tripped, reset it once. If it trips again, stop. A breaker that keeps tripping can mean a shorted heating element or a wiring problem that needs a professional.
The high-limit reset button has tripped
Most electric tanks have a red reset button behind the upper access panel, part of the high-limit safety switch. It cuts power when the water gets too hot. To check it, turn off the breaker, remove the panel and insulation, and press the button firmly. If it clicks, it had tripped. Restore power and give the tank time to reheat. A reset button that trips repeatedly usually points to a failing thermostat or element, so treat a second trip as a signal to call for service.
Failed heating elements or thermostats
Many residential electric tanks have two elements, one near the top and one near the bottom, each with its own thermostat. If the upper element fails, you may get no hot water in house fixtures at all. If the lower one fails, you may get a small amount of hot water that runs out quickly. Testing elements means working inside a high-voltage compartment, so leave it to a licensed plumber.
When you have some hot water, but not enough
Sometimes the problem is not a complete case of no hot water in house fixtures but lukewarm water or hot water that runs out too soon. Common causes include:
- Sediment buildup. Minerals settle at the bottom of the tank, take up space and insulate the water from the burner. Popping or rumbling noises are a common clue; see what popping and rumbling sounds from a water heater usually mean.
- A broken dip tube. This plastic tube sends incoming cold water to the bottom of the tank. If it cracks, cold water mixes with hot water at the top and the water at your faucet turns lukewarm.
- A low thermostat setting. This Old House reports that the U.S. Department of Energy recommends 120°F for most households. If your dial is set well below that, the water may feel lukewarm, especially during long showers.
- A heater that is too small for the household. A tank that kept up with two people may run short after the family grows or a large soaking tub is added.
If you own a Rheem tank, our guide to troubleshooting a Rheem tank that won’t heat covers brand-specific thermostat issues.
What it costs to fix no hot water in house problems
Most no hot water in house repairs are modest. Angi’s 2026 cost data puts the national average water heater repair at about $616, with most homeowners paying between $228 and $1,017. Individual repairs vary widely:
| Repair | Typical national cost (Angi, 2026) | Heater type |
|---|---|---|
| Thermocouple replacement | About $150 or less | Gas |
| Dip tube replacement | About $150 | Gas or electric |
| Electric thermostat replacement | $150 to $200 | Electric |
| Heating element replacement | $200 to $300 | Electric |
| Gas control valve replacement | About $350 | Gas |
| Overall average repair | About $616 (range $228 to $1,017) | All |
For comparison, The 5 Star Plumbing’s typical price for a water heater flush is $300-$400, and The 5 Star Plumbing’s typical price for water heater installation is $2,000-$12,000+; the exact price is confirmed after the technician sees the job. Local prices in Los Angeles and Orange County can differ from national averages, so a written quote for your specific heater is the most reliable number. If a replacement is the right call, our financing options can help spread out the cost.
Repair or replace: how to decide
A thermocouple, element or reset issue behind no hot water in house complaints on a heater in good condition is almost always worth repairing. Replacement starts to make more sense when the problem comes with other warning signs:
| Situation | Usually the better choice |
|---|---|
| Pilot, thermocouple, breaker or reset issue on a tank with no leaks | Repair |
| Single failed element or thermostat, tank otherwise healthy | Repair |
| Water leaking from the tank body itself | Replace |
| Rusty hot water plus repeated breakdowns | Replace |
| Older tank needing an expensive gas valve or multiple parts | Get a quote for both before deciding |
When replacement is the better value, our professional water heater replacement team can size a new tank or walk you through other options.
When to stop and call a professional
Basic no hot water in house checks are safe for most homeowners. Stop and call for help if any of the following apply:
- You smell gas. A.O. Smith advises leaving the area immediately and contacting your gas company or a professional. If SoCalGas is your gas utility, it lists 1-800-427-2200 for gas odor and carbon monoxide emergencies.
- The pilot will not stay lit after one careful relighting attempt.
- The breaker or reset button trips more than once.
- You see scorch marks, melted wiring or soot near the burner or the vent.
- The tank is leaking or the relief valve is discharging water.
Our water heater repair service covers gas and electric tanks and handles no hot water in house calls, and you can browse all of our water heater services for installation, flushing and maintenance.
The bottom line
When there is no hot water in house plumbing, start simple: check whether the problem affects every fixture, confirm the heater has gas or power, look at the pilot or the reset button and check for leaks. Many no hot water in house cases come down to a pilot light, a thermocouple, a tripped breaker or a worn element, all of which are routine repairs. If the tank is leaking, rusty or failing repeatedly, replacement is often the smarter investment.
The 5 Star Plumbing is a family-owned, licensed plumbing company (CA license #1041772) serving Los Angeles, Orange County and the surrounding communities, with experience since 2006 and service available 24/7. Call (888) 909-0120 or contact our team online to get your hot water back.
Frequently asked questions: no hot water in house
Why is there suddenly no hot water in house faucets but cold water works?
If cold water flows normally at every fixture, the water supply is fine and the problem is at the water heater. On a gas heater, check whether the pilot light is out. On an electric heater, check the breaker and the high-limit reset button. If only one fixture is cold, the issue is more likely that faucet’s cartridge or the shower’s mixing valve.
How do I know if my thermocouple is bad?
The classic sign is a pilot that lights but goes out as soon as you release the control knob. A.O. Smith notes that the thermocouple or thermopile powers the pilot safety valve, so a faulty one prevents the pilot from staying lit. Drafts and restricted combustion air can cause similar symptoms, so a plumber will usually rule those out too.
Where is the reset button on an electric water heater?
On most electric tanks it is a red button behind the upper access panel, near the upper thermostat. Turn off the breaker before removing the panel. If the button keeps tripping after you reset it, the heater likely has a thermostat or element problem.
Can sediment cause no hot water in house fixtures?
Heavy sediment usually causes lukewarm water, reduced capacity and noise rather than a complete loss of heat. Over time it can also contribute to overheating at the bottom of the tank and shorten the heater’s life. Regular flushing helps, and The 5 Star Plumbing’s typical price for a water heater flush is $300-$400; the exact price is confirmed after the technician sees the job.
Is it safe to relight a water heater pilot light myself?
If a blown-out pilot is behind your no hot water in house problem, many homeowners can relight a standing pilot by following the instructions printed on the heater. Do not attempt it if you smell gas, if the label is missing or unreadable, or if the pilot will not stay lit after one try. In those cases, leave the area if you smell gas and call your gas utility, or call a licensed plumber for a pilot that keeps going out.
Should I repair or replace a water heater when there is no hot water in house taps?
Repair is usually the right choice for a pilot, thermocouple, element, thermostat or reset issue on a tank that does not leak. Replacement is usually better when the tank itself leaks, the hot water looks rusty or the heater needs repeated or expensive repairs.
Sources: Angi – How Much Does Water Heater Repair Cost? (updated Aug 2026) · A.O. Smith – How to Relight a Water Heater’s Pilot Light · SoCalGas – What should I do if my pilot light is out? · This Old House – How to Adjust Water Heater Temperature
