Hot water usually comes back in about 20–80 minutes after it’s been used up, depending mainly on your heater type and size.

How long for hot water to come back?

Typical ranges after you “run out” of hot water:

  • Gas tank heater: about 20–40 minutes to recover.
  • Electric tank heater: about 60–120 minutes, especially for larger 50–80 gallon tanks.
  • Standard home tank (mixed cases): many homes see 20–60 minutes for hot water to return.
  • Tankless heater: effectively “on demand” — if sized correctly and working, you shouldn’t need to wait for hot water to come back.

If it takes more than about 1 hour for gas or 2 hours for electric to feel normally hot again, it can be a sign of a problem such as sediment buildup, a bad heating element, or thermostat issues.

Forum-style rule of thumb: many users say that waiting 6–7 minutes just for hot water to reach a shower is already “too long” in most homes; longer waits often point to long piping runs or plumbing issues rather than the heater itself.

When it might take longer

Hot water can take longer to return if:

  • Large tank (e.g., 80 gallons) needing 1–2 hours for a full reheat, especially on electric.
  • Multiple showers or appliances running back-to-back (dishwasher, washer, etc.).
  • Old heater with sediment buildup on the bottom of the tank, which slows heat transfer.
  • Long distance between heater and tap (for example, over 80 feet of pipe to a shower).

Quick checks if your hot water is “not coming back”

You can run through a simple mental checklist:

  1. Think about your heater type: gas vs electric vs tankless.
  1. Count how long it has been since you drained the hot water (e.g., long shower or multiple uses).
  2. If:
    • Gas: still no reasonably hot water after about 60 minutes, or
    • Electric: still cold after about 2 hours,
      then there might be a fault and it’s worth calling a pro.

How to help hot water come back faster

Simple improvement ideas people and pros often use:

  • Lower thermostat a bit (e.g., 140°F down to 120°F) so the heater reaches the set temperature faster and runs more efficiently.
  • Insulate the tank and hot water pipes to reduce heat loss and shave recovery time by roughly 10–15 minutes in some setups.
  • Flush the tank once or twice a year to remove mineral sediment and restore heating efficiency.
  • Install low‑flow showerheads so each shower uses less hot water, leaving more for the next person.
  • Consider upgrading heating elements (for electric) or the entire unit, or moving to a tankless system if you regularly run out.

TL;DR: For most homes, expect hot water to come back somewhere between about 20 and 60 minutes, faster with gas and slower with electric; if you’re waiting much longer, it may be a maintenance or repair issue.

Information gathered from public forums or data available on the internet and portrayed here.