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DIY Plumbing: No Hot Water!

Updated on April 06, 2016

First-Things-First: Gas or Electric?

Oh no, you've got no hot water! Hang on, don't call the plumber quite yet. Take a moment to troubleshoot because there are several minor issues that are easy to fix. Water heaters are some of the most long-lasting and reliable appliances made, sometimes they just need a little attention to get them back on track.

The first thing to do, is to determine if you've got a gas or electric water heater. If you don't already know, take a look at your water heater: it is more-than-likely labeled gas or electric. Also, you may be able to refer to your owner's manual. Perhaps the home is older and you have no manual or label, you can still tell by the following:

  • A gas water heater will have a pilot flame and a way to choose "pilot," "on," and "off."
  • An electric water heater will have some kind of electric plug to power the appliance.
  • A gas water heater will have a vent on the top that looks like a chimney.
  • A gas water heater has a gas line with a shut-off valve that looks like the photo below.

Is Your Water Heater Gas or Electric?

Often, your water heater is labeled as gas...
Often, your water heater is labeled as gas...
...or electric.
...or electric.

Gas Water Heaters


Common Problem #1: The Pilot Light Needs To Be Re-Lit

If you determine that you have a gas water heater, check to make certain that the pilot light is still on. If you are unsure of the location of the pilot light, try looking inside the access or inspection panel that will usually be near the bottom of the tank. You may have to remove a few screws to get inside this panel. You should also find a knob with the choices "pilot," "on," and "off." If you do not see a flame, this is probably the cause of your troubles. To re-light the pilot flame:

  • Turn the pilot switch or knob to "off" for a few seconds.
  • Turn the switch to "pilot" to light the flame.
  • Once the pilot is lit, switch the knob to "on."
  • If the flame stays lit, you are back in business. You should have hot water soon.

Make Sure That The Gas Is Turned On

It may be as simple as turning on the gas to the water heater.  This handle is in the "off" position.
It may be as simple as turning on the gas to the water heater. This handle is in the "off" position.

Common Problem #2: No Gas

If you could not light the pilot or it won't stay lit, the problem might be the gas supply.

  • Make sure the valve handle on the gas line is aligned with the pipe. If it is not, your gas is just turned off; simply turn it on (see photo, right.)
  • Make sure the gas to your home is on and in supply. To test this, turn on another gas powered appliance in your home, such as a gas burner.

Common Problem #3: Gas Water Heater Thermostat Is Set Too Low

Check the thermostat on the water heater. It should be in the "normal" range (120°-135°F or around 50°C.) If it is not, this is your problem; turn it up. If it is, try resetting it by turning it all the way down and then back up again, you should hear the water heater kick back on.

Gas Water Heater Thermostat

The thermostat on you water heater should be set to 120-135F or around 50C.
The thermostat on you water heater should be set to 120-135F or around 50C.

Check Your Circuit Panel

Resetting a circuit is as easy as flipping a switch.
Resetting a circuit is as easy as flipping a switch.

Electric Water Heater

Common Problem #1: The Circuit Breaker Needs To Be Reset

As with any electric appliance, the first thing to check if your electric water heater fails, is your circuit breaker box (or fuse box in older homes.) Check to see if the circuit to the water heater needs to be reset. If you have a fuse box (will look like little glass windows instead of switches,) you may need to replace a burned out fuse.

More About Resetting Breakers and Replacing Fuses

Common Problem #2: Electric Water Heater Thermostat Is Set Too Low

Check the thermostat on the water heater. It should be in the "normal" range (120°-135°F or around 50°C.) If it is not, this is your problem; turn it up. If it is, try resetting it by turning it all the way down and then back up again, you should hear the water heater kick back on.

When To Call In The Professionals

If you have any of the following problems with your water heater, it probably means that your appliance is simply worn out and it is time for a replacement:

  • Cracks, leaks or rust on the tank
  • Rust in the water
  • Smelly water (smells like sulfur)
  • Unusual, alarming noises coming from the water heater or adjacent pipes
  • None of the trouble shooting list above worked

In this case, I strongly caution against trying to install a new water heater yourself. This will often void your warranty and could be just plain dangerous!

Do you have a gas or electric water heater?

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    • Andro da Costa profile image

      Andro da Costa 20 months ago

      Fantastic information in this article ! Also another great place for information can be found here http://www.waterheatergeek.com

    • Mrs. Menagerie profile image
      Author

      Mrs. Menagerie 21 months ago from The Zoo

      Glad this helped!

    • Christina 21 months ago

      Thank you!!!! All I had to do was reset the breaker. Whew. Thank you so much!

    • Charlie 3 years ago

      Really helps a lot! thanks for giving some tips and advice. Now i know how to trouble shot water heater. Thumbs up.

      http://www.plumbernorthsydney.com.au

    • glen 3 years ago

      it worked, omg, thanks a lot! had no hot water this morning, followed the instructions and now I have hot water.

    • Stephanie 3 years ago

      Thank you so much! Other sites I've been on didn't mention resetting the temperature. Such a simple step, and it sounds like things are heating up finally :)

    • MrWaterheater profile image

      MrWaterheater 4 years ago

      A good tip is to flush the water heater - this will ensure maximum efficiency. And this will stop any smelly water problems too!

    • gas water heater 4 years ago

      I got good info from your blog.

      Regards:

      http://www.noritz.com/

    • Mrs. Menagerie profile image
      Author

      Mrs. Menagerie 5 years ago from The Zoo

      Are we talking about an electric water heater here?

    • Vlad 5 years ago

      Hi, thanks for sharing all your useful tips. However, I've checked all the wires and both elements of the heater, everything seems to be fine, there is power to both elements and both elements are good (checked them with ohm-meter). And still there is no hot water at the tap.

      What to do??

    • Mrs. Menagerie profile image
      Author

      Mrs. Menagerie 5 years ago from The Zoo

      Thank you mrcan, it's nice to meet you!

    • mrcan profile image

      mrcan 5 years ago from Malaysia

      hi I know nothing about plumbing, but after reading through this hub, I learned a lot of great solution and tips.

      Good hub. Voted up

    • Mrs. Menagerie profile image
      Author

      Mrs. Menagerie 5 years ago from The Zoo

      Wow, thanks so much Nspeel!!!!

    • Nspeel profile image

      Nspeel 5 years ago from Myrtle Beach

      I love how in depth you went here great hub on plumbing. I have seen nothing but great plumbing articles out of everyone. Voted up great job this looks worth of "Hub Of The Day."

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