When your hot water stops working—or doesn’t last like it should—it can throw off your whole day. Below are the most common water heater questions we get, along with straightforward answers from a professional plumber.

1. Why is my water heater not producing hot water?

Common causes include:

  • Pilot light out (gas units)
  • Gas supply issues
  • Plugged air intake/filter (gas units)
  • Tripped breaker (electric units)
  • Faulty heating element or thermostat

2. How long should a water heater last?

  • Tank water heater: Typically 7–10 years (based on standard 6-year warranty models)
  • Tankless water heater: 15–20+ years

Regular maintenance—especially flushing—can extend the lifespan.

3. Why is my water heater leaking?

Leaks usually come from:

  • Loose fittings or valves
  • Temperature & pressure (T&P) valve
    • Failed valve
    • High water pressure
    • Failed thermal expansion tank
  • Tank corrosion (usually means replacement)

4. Why does my hot water run out so fast?

  • Sediment buildup in the tank
  • Failing heating element
  • Tank too small for your household
  • Cross connection in the plumbing system

5. What size tank water heater do I need?

General guidelines:

  • 1–2 people: 30–40 gallons
  • 3–4 people: 40–50 gallons

Larger households or high-demand usage may require more capacity.

6. Why is my water heater making noise?

Popping or rumbling sounds are usually caused by sediment buildup.

Minerals like calcium settle at the bottom of the tank. Water trapped underneath overheats and expands, causing noise.

Over time, this buildup:

  • Reduces efficiency
  • Causes overheating
  • Shortens the life of the heater

Flushing may help, but heavy buildup may require replacement.

7. How often should I flush my water heater?

  • Manufacturer recommendation: once per year
  • In hard water areas (like Utah): more often may be needed

8. Why does my hot water smell like rotten eggs?

  • Caused by bacteria reacting with the anode rod
  • Common fix:
    • Replace the anode rod (often aluminum/zinc)
    • Disinfect the tank

9. What is the difference between tank and tankless water heaters?

Tank Water Heater

  • Stores hot water
  • Lower upfront cost
  • Gas: ~60–70% efficiency (up to 75–80% high-efficiency models)
  • Electric: ~90–98% efficient but higher operating cost

Tankless Water Heater

  • Heats water on demand
  • 90–98% efficiency
  • Longer lifespan
  • Higher upfront cost

10. Do I need a professional to install or repair a water heater?

Yes—especially for:

  • Gas connections
  • Venting systems
  • Pressure and safety controls

Improper installation can lead to:

  • Water damage
  • Gas leaks
  • Carbon monoxide hazards

Choosing the Right Water Heater

There are many options when it comes to water heaters. The right system depends on your home, water usage, and long-term goals.

At Mike Bachman Plumbing, we focus strictly on plumbing. If you have questions or need help choosing the right system, we’re here to help.