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Reviewed by Marcus Aldridge — Senior Editorial Reviewer — Plumbing, HVAC & Wet Trades

Who to call · Plumber

No hot water: call a plumber — or fix it yourself

Losing hot water is uncomfortable and can point to a failing water heater, a broken thermostat, or a sediment buildup in the tank. A plumber who specializes in water heaters can diagnose the cause and restore your hot water quickly.

Is this your problem?

Symptoms to look for

  1. 01

    Water stays cold regardless of faucet position

  2. 02

    Hot water runs out much faster than usual

  3. 03

    Strange popping or rumbling sounds from the water heater

  4. 04

    Rusty or discolored hot water

Who to call

Plumber

A plumber or heater technician tests elements and thermostats, replaces a failed gas valve or thermocouple, and tells you honestly whether a 12-year-old tank is worth the repair.

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Fix it yourself

How to fix no hot water

No hot water

easy 15–45 min

Tools: flashlight, screwdriver, multimeter (electric heaters, optional)

Steps

  1. Electric heater: check the breaker in the panel — a tripped double breaker sits between on and off; switch it fully off, then on.
  2. Electric heater: remove the upper access panel, fold back the insulation, and press the red high-limit reset button; if it clicks, wait an hour for hot water.
  3. Gas heater: check the pilot or status light through the sight glass; follow the relighting instructions printed on the tank.
  4. Check the thermostat dial — it should read about 49–60 °C (120–140 °F); someone may have turned it down.
  5. Confirm the cold inlet valve on top of the tank is open and that other gas appliances work (a closed gas valve or empty tank affects all of them).

Stop and call a pro if

  • the breaker or high-limit reset trips again — a failed element or thermostat is drawing too much current
  • the pilot will not stay lit after two attempts, or you smell gas
  • the tank is leaking or the floor around it is wet

What a pro does that you can't

A plumber or heater technician tests elements and thermostats, replaces a failed gas valve or thermocouple, and tells you honestly whether a 12-year-old tank is worth the repair.

DIY cost: $0–40 for a thermostat or element if you are comfortable with electrical work

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FAQ

Frequently asked questions

Who should I call for: No hot water?

Call a licensed plumber. Plumbers have the specialized training, tools, and insurance to diagnose no hot water safely and stand behind the fix. Most offer free quotes and can visit the same day or the next.

Can I fix this myself?

Often, yes: the guide above has 5 steps (easy, 15–45 min, $0–40 for a thermostat or element if you are comfortable with electrical work). Stop and call a plumber if the breaker or high-limit reset trips again — a failed element or thermostat is drawing too much current.

How fast can a pro come out?

Most plumbers offer same-day or next-day visits for non-emergency issues. True emergencies (burst pipes, gas smell, no heat in winter) are typically handled within 1–4 hours.

How much does it cost to fix?

Costs vary by severity and your location. Submit a free quote request to get real pricing from local pros in your area.

What are the signs of: No hot water?

Water stays cold regardless of faucet position. Hot water runs out much faster than usual. Strange popping or rumbling sounds from the water heater. Rusty or discolored hot water.

Who to call

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