Gas Water Heater Installation & Repair in Tacoma, WA

Natural gas water heaters are the most popular choice in Pierce County homes with Puget Sound Energy gas service. Gas heats water faster than electric, recovers more quickly after heavy use, and in most of the area — where PSE electric rates run higher — costs significantly less to operate month to month.

Is Gas Available at Your Address?

Puget Sound Energy (PSE) is the sole natural gas provider across all of Pierce County. Most established neighborhoods in Tacoma, Lakewood, University Place, Puyallup, Federal Way, and Gig Harbor have gas mains available. Rural areas including parts of Graham, eastern Spanaway, and newer construction zones in Bonney Lake may not have gas service at the street. If you are unsure, your plumber can confirm availability before quoting. Connecting to a new gas main costs $500–$2,000+ depending on distance.

2026 PSE Natural Gas Rates

PSE natural gas rates increased approximately 7% effective January 2026 following Washington UTC approval. The average residential customer using 64 therms per month now pays roughly $90/month for all gas use. Water heating typically accounts for 30–40% of that — approximately $25–$45/month depending on household size and unit efficiency. That is meaningfully less than operating a standard electric tank on PSE electric rates, which rose ~12% in January 2026 to roughly $0.13–$0.15/kWh.

Note: Homes on Tacoma Power (city of Tacoma, Lakewood, University Place) pay approximately $0.045/kWh — one of the lowest electric rates in the nation — making electric tanks cost-competitive with gas for those customers. See our electric water heater page for details.

Gas Water Heater Installation Requirements in Tacoma

All gas water heater installations in Pierce County must comply with the Washington State Plumbing Code and local amendments. Requirements include: a metal B-vent flue or PVC power-vent routed to the exterior, a gas shutoff valve within 6 feet of the unit, a drip leg (sediment trap) on the gas supply line, earthquake straps at the upper and lower third of the tank, a thermal expansion tank on closed plumbing systems, a drain pan for indoor installations, and a plumbing permit ($85–$150) pulled by your licensed plumber. Carbon monoxide detectors are required on every level of the home.

Tank vs. Tankless Gas

A standard 50-gallon gas tank water heater costs around $2,500 installed and lasts 8–12 years. A gas tankless unit costs $5,000–$7,000 installed, lasts 20+ years, and reduces water heating energy costs by 24–34%. Gas tankless units with a UEF of 0.82 or higher qualify for a federal tax credit of up to $600/year through 2032. Your plumber will assess your gas line size (3/4″ minimum for most tankless units) and venting before recommending a model.

Common Gas Water Heater Repairs

The most frequent gas water heater repair is thermocouple replacement — the safety device that keeps the pilot lit. A failed thermocouple typically costs $150–$300 to replace. Other common repairs include gas valve replacement ($200–$400), burner assembly cleaning ($100–$200), and anode rod replacement ($150–$250). If you smell gas at any time, leave the house immediately, call 911 from outside, then call PSE at 1-888-225-5773. Do not operate any switches or create sparks.