Water heater replacement cost in Seattle (2026):
tank, tankless and heat pump
HOW MUCH DOES WATER HEATER REPLACEMENT COST IN SEATTLE?
We didn't find a published Seattle-only figure. For Washington State, HomeServe's contractor data puts the average water heater replacement at $1,797, about 29% above the U.S. average (September 2025). Nationally, Angi lists $882 to $1,826 for a tank replacement and $1,400 to $3,900 for tankless. Seattle City Light offers $750 off a qualifying heat pump water heater.
Water heater cost by type
| Type | Installed, U.S. (Fixr) | Replacement, U.S. (Angi) | Lifespan (Fixr) |
|---|---|---|---|
| Tank (gas or electric) | $600–$2,500 | $882–$1,826 | 8–12 years |
| Tankless | $1,000–$4,000 | $1,400–$3,900 | 15–20 years |
| Heat pump (hybrid) | $1,200–$4,600 | not listed | not listed |
By fuel, Fixr lists $500 to $3,500 for electric units and $700 to $2,700 for natural gas, installed.
Tank water heater cost by size
| Tank size | Installed (Angi) | Household (Angi) |
|---|---|---|
| 30 gallons | $700–$2,100 | 1–2 people |
| 40 gallons | $800–$2,300 | 1–4 people |
| 50 gallons | $800–$2,500 | 3–5 people |
| 75 gallons | $1,100–$4,000 | 4–6 people |
| 80 gallons | $1,300–$7,500 | Large households, high demand |
Labor and extra costs
| Item | Cost | Source |
|---|---|---|
| Labor to replace a tank unit | $150–$450 | Angi |
| Labor to replace a tankless unit | $600–$1,900 | Angi |
| Converting tank to tankless (labor) | $150–$2,500 | Angi |
| Power venting | $300–$1,000 | Fixr |
| Removing the old unit | $75–$500 | Fixr |
| Permit | $25–$300 (Angi); $25–$1,500 (Fixr) | Angi; Fixr |
Seattle heat pump water heater rebate
Seattle City Light offers $750 on a qualifying heat pump (hybrid) water heater, one rebate per customer. The unit must be a Tier 3 or Tier 4 model on City Light's qualified product list. There are three ways to get it:
- Through a contractor: the discount is applied in the bid and invoice; contractors get it through participating distributors.
- Instant coupon: a digital coupon at listed Lowe's and The Home Depot stores.
- Rebate form: for other suppliers, submit City Light's online form with your invoice within 93 days of purchase. The form also requires an ENERGY STAR rated unit.
Applied to Fixr's heat pump range of $1,200 to $4,600, the rebate would bring the price to about $450 to $3,850 before tax (our calculation). The federal tax credit for heat pump water heaters doesn't apply to equipment placed in service after 2025, according to the IRS.
Seattle permit and code requirements
- In Seattle, plumbing and gas piping permits are issued by Public Health – Seattle & King County, not SDCI. It also issues homeowner permits, though it recommends hiring a professional plumber.
- Changing or adding gas piping needs a separate gas piping permit (Public Health – Seattle & King County).
- The Uniform Plumbing Code used in Washington requires a permit to "install, remove, or replace" a water heater (UPC 502.1, as quoted in a City of Des Moines, WA checklist).
- Seismic straps: two 20-gauge straps, one on the upper third of the tank and one on the lower third (Public Health – Seattle & King County).
- An expansion tank or other approved device is required on closed water systems, and the relief valve pipe must drain by gravity to the outside or an approved drain.
Repair or replace?
Angi lists $100 to $500 to repair a tank water heater and $100 to $1,300 for tankless. HomeServe's Washington data puts an average repair at $306 and a diagnosis visit at $104. Fixr gives tank units an 8- to 12-year lifespan. If your tank is near or past that age, ask the plumber to price both the repair and a replacement.
Before you sign
- Washington contractors collect sales tax "on the gross contract price," labor included (Department of Revenue). Seattle's rate is 10.55% since January 1, 2026.
- Ask whether the quote includes the permit, straps, expansion tank, haul-away of the old unit and any venting or electrical changes. A heat pump water heater may need more electrical capacity; see our electrical panel upgrade cost guide.
- Look the plumber up on L&I's Verify a Contractor tool: active license, bond, insurance and past violations.
- For jobs of $1,000 or more on a home, the contractor must give you a written disclosure statement before work starts (RCW 18.27.114).
Heating your home too? See our heat pump installation cost in Seattle guide. Sewer problems: sewer line replacement cost.
Frequently asked questions
How much does water heater replacement cost in Seattle?
We didn't find a Seattle-only figure. HomeServe puts the Washington State average at $1,797 (September 2025). Nationally, Angi lists $882 to $1,826 for a tank replacement and $1,400 to $3,900 for tankless. Seattle's 10.55% sales tax applies to the whole contract.
How much does a heat pump water heater cost?
Fixr lists $1,200 to $4,600 installed. Seattle City Light offers $750 off a qualifying Tier 3 or Tier 4 model, one rebate per customer.
How much does a tankless water heater cost to install?
Angi lists $1,400 to $3,900 to replace a tankless water heater, and $150 to $2,500 in labor to convert from a tank. Fixr lists $1,000 to $4,000 installed.
Do I need a permit to replace a water heater in Seattle?
Yes. The Uniform Plumbing Code used in Washington requires a permit to replace a water heater, and in Seattle plumbing and gas piping permits come from Public Health – Seattle & King County.
How long does a water heater last?
Fixr gives tank water heaters 8 to 12 years and tankless units 15 to 20 years.
Sources
- Angi — How Much Does Water Heater Replacement Cost? (updated Jul 20, 2026)
- Fixr — How Much Does It Cost to Install a Water Heater? (updated January 27, 2026)
- HomeServe — Water heater costs in Washington State (September 1, 2025)
- Seattle City Light — Home Energy Solutions (heat pump water heaters)
- Public Health – Seattle & King County — Installing a new water heater and plumbing and gas piping permits
- City of Des Moines, WA — Water heater checklist (UPC references)
- IRS — Energy Efficient Home Improvement Credit; WA Department of Revenue; RCW 18.27.114; L&I — Hiring a contractor
All sources accessed October 12, 2026. Rebates and fees change; check City Light and Public Health – Seattle & King County before you buy.
These figures are estimates compiled from the published sources above. They are not quotes and can't account for your home or your plumber. Rebate, tax and permit rules can change, so confirm them with the utility, your contractor and the permit office. This is not tax advice. Get written estimates from licensed, bonded and insured contractors before deciding. See our disclosure and disclaimer.