Best Water Heater Replacement in Seattle, WA

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Cost Summary

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How long does a water heater last? Tank water heaters typically last 8–12 years. Tankless (on-demand) units last 15–20 years with proper maintenance. If yours is approaching or past those ranges and showing problems, replacement is usually more cost-effective than repeated repairs.

What are signs I need to replace my water heater? Key warning signs include: rusty or discolored hot water, water that never gets fully hot, rumbling or popping noises (sediment buildup), moisture or pooling around the base, or a tank that is 10+ years old. A single failed heating element is repairable; a corroded tank is not.

How much does water heater replacement cost? A standard 40–50 gallon gas tank replacement costs $900–$1,800 installed. Electric models run $750–$1,500 installed. Tankless gas units run $1,500–$3,500 installed. Prices vary by region, fuel type, and access difficulty (closet installs cost more than garage installs).

How long does installation take? A like-for-like tank replacement typically takes 2–4 hours for an experienced plumber. A switch from tank to tankless, or a fuel-type change, can take 4–8 hours due to additional venting, gas line, or electrical work required.

What size water heater do I need? For tank heaters: 30–40 gallons for 1–2 people, 40–50 gallons for 3–4 people, 50–80 gallons for 5+ people. For tankless units, size by flow rate (GPM) and temperature rise needed — a plumber will calculate this based on simultaneous fixture usage.

Is a tankless water heater worth it? Tankless units use 24–34% less energy than tank models and last significantly longer. Upfront cost is 2–3× higher, but long-term savings on energy bills often offset this within 7–10 years. They also provide unlimited hot water and take up less space. Best for homes where gas is available.

What permits are required? Most jurisdictions require a permit for water heater replacement. A licensed plumber handles this automatically. Unpermitted work can cause problems during home sales and may void manufacturer warranties.

Can I DIY a water heater replacement? Gas water heater replacement involves working with gas lines and venting — this is not a safe DIY project for most homeowners. Electric replacements are more approachable, but still require working near the main electrical panel and following strict code requirements. Mistakes can create fire, flooding, or carbon monoxide hazards.