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Water & Damage

Hot water tank burst: what to do?

A burst hot water tank can cause serious water damage and poses electrical and burn risks. Act quickly to shut off the water and power, then call a professional.

Written by Emma Richardson · Reviewed by Thomas Weber · Updated October 31, 2026 · Reviewed October 29, 2026 · 2 min read

Immediate actions

  1. 1 Shut off the water supply to the tank (turn the valve clockwise).
  2. 2 Turn off the power to the water heater at the breaker or gas valve.
  3. 3 Open a hot water tap to drain pressure and reduce flooding.
  4. 4 Call a licensed plumber immediately.
  5. 5 Document damage with photos for insurance.

What not to do / warning

Risk of electrical shock if water reaches electrical outlets or the panel. Do not touch electrical devices while standing in water. If you smell gas, leave immediately and call emergency services.

A burst hot water tank releases scalding water and can cause rapid flooding, electrical hazards, and structural damage. Stay calm and act fast to minimize harm.

What is happening

The tank has ruptured, likely due to corrosion, high pressure, or age. Water may be pouring out, and if the heater is electric, there is a risk of electrical shock. If gas, there may be a gas leak.

Emergency warning

If water is near electrical outlets, panels, or appliances, do not touch anything electrical. Call your local emergency services if there is a fire, gas smell, or risk of electrocution.

What to do first

  1. Shut off the water supply. Turn the valve on the cold water inlet pipe to the tank clockwise until it stops. If you can't find it, turn off the main water valve to the house.
  2. Turn off the power. For electric heaters, switch off the breaker at the main panel. For gas, turn the gas valve to the off position (usually a quarter turn).
  3. Open a hot water tap (e.g., a sink or tub) to relieve pressure and drain remaining water.
  4. Call a licensed plumber for repair or replacement.
  5. Document the damage with photos and contact your insurance company.

What NOT to do

  • Do not stand in water while touching electrical switches or appliances.
  • Do not attempt to repair the tank yourself.
  • Do not ignore a gas smell; leave the house and call the gas company or emergency services.
  • Do not use electrical devices near the water.

When to call for help

Call emergency services if there is a fire, gas leak, or someone is injured. For water damage, call a plumber immediately. If the water is near electrical panels, call an electrician.

What to monitor

Watch for signs of structural damage (sagging ceilings, cracks) and mold growth in the coming days. Keep the area ventilated and dry out as much as possible.

How to prevent it

Regularly maintain your water heater: flush the tank annually to remove sediment, check the pressure relief valve, and replace the anode rod every few years. Consider installing a leak detector and a drip pan.

This is general information and not a substitute for professional advice. In an emergency, call your local emergency services.

Sources & references

  • American Red Cross - Water Damage Safety (https://www.redcross.org/get-help/how-to-prepare-for-emergencies/types-of-emergencies/water-damage.html)
  • FEMA - Water Damage (https://www.fema.gov)