Water Heater Not Working? Here's What to Check First

No hot water is one of the most jarring plumbing problems a homeowner can wake up to. Before you call a plumber, there are a few things worth checking on your own — some water heater problems have simple fixes that take five minutes and cost nothing.

That said, some don't. And some water heater problems — particularly with gas units — can be dangerous to investigate without professional help.

Here's how to quickly diagnose what's happening with your water heater, what you can safely check yourself, and when to call Precision Plumbing & Septic in Canton.

Is it a gas or electric water heater?

The first thing to know is what type of water heater you have, because the diagnosis process is different for each.

Gas water heaters have a flue pipe (a metal exhaust pipe) running out of the top or side. They also have a gas supply line and a pilot light (on older units) or an electronic ignition (on newer ones). If you can see a blue flame through the small window on the unit, the pilot is lit.

Electric water heaters have no flue pipe. They run on electricity and have one or two heating elements inside the tank. They're controlled by a thermostat and have a reset button on the unit.

Tankless water heaters (demand water heaters) are compact wall-mounted units with no storage tank. They heat water on demand and have their own specific troubleshooting steps.

Common causes of no hot water

Here are the most frequent reasons a water heater stops producing hot water, organized by type:

Gas water heaters:

• Pilot light is out (older units)

• Thermocouple has failed (the component that keeps the pilot lit)

• Gas supply has been interrupted

• Thermostat set too low or has failed

• Sediment buildup reducing heating efficiency

• Heating element has failed (yes, gas heaters also have a burner assembly that can fail)

Electric water heaters:

• Circuit breaker has tripped

• Reset button has tripped (there's a red button on the thermostat panel — this trips when water gets too hot)

• Heating element has burned out

• Thermostat has failed

• Sediment buildup causing the element to overheat

All types:

• The unit is undersized for current hot water demand

• The unit has reached end of life (typically 10 to 15 years for tank water heaters)

• A supply line valve has been accidentally closed

  
  

What to check before calling a plumber

These checks are safe to do yourself and cover the most common causes:

1. Check the circuit breaker (electric only). Go to your electrical panel and look for a tripped breaker — one that has flipped to the middle position or to "off." Reset it and wait 30 minutes to see if hot water returns. If it trips again immediately, stop and call — a breaker that keeps tripping indicates an underlying electrical problem.

2. Check the reset button (electric only). On the front of the upper thermostat (there's typically a panel you can access with a screwdriver), look for a red button. If it has popped out, press it in. Wait 30 minutes. If it trips again, the element or thermostat has likely failed.

3. Check the pilot light (gas only, older units). If you have an older gas water heater with a standing pilot, check whether the pilot light is lit by looking through the small viewing window near the bottom of the unit. If it's out, the unit will have relighting instructions printed on the label — typically involves turning the gas knob to "Pilot," pressing it in, and using a long lighter. Follow those instructions carefully or call us.

4. Check the gas supply (gas only). Make sure the gas shutoff valve on the supply line to the water heater is fully open (handle parallel to the pipe = open). Also check whether other gas appliances in the home are working — if the stove isn't lighting either, you may have a gas supply interruption that requires a call to your gas utility.

5. Check the water supply valve. The cold water inlet valve is typically located above the water heater. Make sure it's fully open. An accidentally closed valve means no cold water enters the tank, which means no hot water comes out.

6. Check the thermostat setting. The thermostat on your water heater should be set to 120°F for most households (higher for homes with dishwashers that don't have their own heating element). If it's been turned down significantly, that's your answer.

7. Check the age of the unit. Look for a label on the side of the water heater — the first four digits of the serial number are often the manufacturing date. A water heater older than 10 to 12 years that's starting to fail is telling you something.

When you need a professional repair

Stop your self-diagnosis and call if:

• The circuit breaker trips again after you reset it

• The reset button pops again immediately after you press it

• You smell gas near the water heater

• You see water pooling around the base of the unit (this usually means tank failure, not a minor repair)

• You hear loud rumbling, popping, or banging from the tank (indicates heavy sediment buildup or in some cases tank failure)

• The pilot won't stay lit after multiple relighting attempts

These situations require a licensed plumber. Working on water heater components without proper training — particularly gas components — carries real risk of injury.

When to replace instead of repair

A repair makes sense when the unit is relatively young and the problem is an isolated component failure. A replacement makes more sense when:

The unit is 10 to 15 years old. The average tank water heater lasts 10 to 15 years. If yours is in that range and starting to have problems, a repair buys you 1 to 2 more years at best. A replacement gives you a decade of reliable service.

You're seeing rust or corrosion in your hot water. Rusty hot water coming from the tap (but not the cold tap) indicates the tank is corroding from the inside. This can't be repaired — the tank needs replacement.

You're facing a major repair on an old unit. If the repair estimate is more than 50% of the cost of a new unit and the existing unit is 8+ years old, replacement is usually the better investment.

You have an opportunity to upgrade efficiency. Modern water heaters — particularly heat pump water heaters and tankless units — are dramatically more efficient than units installed 10 to 15 years ago. If you're replacing anyway, it's worth considering a more efficient option.

In the Canton area, a standard 50-gallon tank water heater replacement typically runs $800 to $1,500 installed, depending on the brand and installation complexity. A tankless unit typically runs $1,500 to $3,500 installed.

Frequently asked questions

How long does a water heater repair take?

Most water heater repairs — element replacement, thermostat replacement, pilot assembly repair — take 1 to 2 hours once the part is in hand. Same-day service is usually available in Cherokee County. Call (678) 658-3170) to confirm.

My hot water runs out faster than it used to. Is that a repair or replacement issue?

Usually a repair. A water heater that used to last through two showers but now only manages one is almost always dealing with sediment buildup — mineral deposits that accumulate at the bottom of the tank and reduce its effective capacity and efficiency. In many cases, a flush and element check resolves it.

Should I replace my water heater before it fails?

If it's 10+ years old and you're planning to be in the home long-term, proactive replacement is worth considering. You choose the timing instead of being forced into it during a cold shower. Precision can evaluate your current unit and give you an honest recommendation.

Does Precision work on all brands?

Yes. We service and replace all major water heater brands — Rheem, Bradford White, A.O. Smith, State, Rinnai, Navien, and others. If we're recommending replacement, we'll give you a few options at different price points and explain the tradeoffs clearly.

Is there anything I should do if I'm going on vacation?

Yes — turn your water heater down to its "vacation" or lowest setting. Running a water heater at full temperature while the house is empty is unnecessary energy cost. For longer absences, turn off the water supply to the heater entirely.

Bottom line

Before you call, check the circuit breaker, the reset button, the pilot light, and the gas supply. Those four checks cover the majority of "no hot water" situations that turn out to have a simple fix.

If none of those solve it, or if you're seeing water pooling, smelling gas, or dealing with a unit that's 10+ years old, call Precision Plumbing & Septic at (678) 658-3170). We handle water heater repair and replacement throughout Canton and all of Cherokee County, with same-day service available for most locations. Upfront pricing before we start — always.