For gas water heater repairs, look for licensed plumbers specializing in water heater services. A plumber is generally a better choice than a handyman to help ensure safety, project efficiency and a job well done.

Before you hire someone, do the following: 

• Verify their license and insurance. Check with your state’s licensing board to see if their license and insurance is still valid.

• Read the reviews and ratings for each professional to gauge customer satisfaction.

• Contact plumbers and ask for the brand name and size of the gas water heaters they carry and install (just in case you end up needing to replace it).

• Find out how they handle warranties and repair issues. You’ll want to choose a plumber who can guarantee their workmanship and parts.

• Ask how soon they could do the work and how long it will take. If you’re experiencing a major leak or inconsistent water temperature, you’ll want a plumber who can fix your unit ASAP. 

• Get multiple quotes, but avoid choosing solely on cost. Expertise, availability and service reliability are also important. Still, compare prices to help ensure you’re not overpaying for repair services. 

Recognizing when to replace your gas water heater can prevent costly breakdowns and ensure safety. Key warning signs often include:

• Old age (many only last 6 to 12 years)

• Rust-colored water

• Increased energy bills

• Frequent repairs

• Water pooling around the heater 

• Unusual noises like rumbling or banging

• Persistent issues with water temperature and pressure 

The bottom line: consider replacement if repairs become too frequent, costly or inconvenient. Upgrading to a newer, more efficient model can also help lower energy costs, improve performance and give you peace of mind. 

Maintaining your gas water heater is essential for its longevity and efficiency. Here are several gas water heater maintenance tips that can potentially help you avoid costly repairs in the future:

• Drain the tank once or twice a year to remove sediment that can hinder performance. If you live in an area with hard water, consider draining every six months. 

• Regularly check the pressure relief valve to ensure it operates correctly, as it's crucial for safety. 

• Inspect the anode rod every 6 to 12 months, and replace it if it's corroded to prevent tank damage. 

• Keep the area around the water heater clear of debris to ensure adequate airflow and reduce fire hazards. 

• Have a professional plumber inspect the heater and its gas connections annually to ensure everything functions safely and efficiently.

A licensed plumber can generally replace a gas water heater within 2 to 4 hours. Proper installation includes disconnecting the old water heater from the gas line and waterline, draining the old tank, removing it and then setting up the new heater. 

The time can increase if there are accessibility issues, upgrades needed for code compliance or adjustments required for different heater sizes or models. Replacing shutoff valves or upgrading gas lines will likely increase the installation time too. 

Remember: The timeline for your project will vary depending on many factors. Always ask your pro to provide an estimate.