Boiler Replacement Cost in Bellevue, Washington
Expect to pay $8,200 to $18,500 for boiler replacement in Bellevue, WA. Most homeowners end up near $13,900, depending on the equipment tier and how much of the old setup can be reused.
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Bellevue Weather and HVAC Load
In a normal year, Bellevue racks up 4,482 heating and 210 cooling degree days (NOAA 1991-2020 normals). Heating is the bigger job here, and furnaces and heat pumps in Bellevue put in far more hours than the air conditioner. Count on roughly 25 nights below 32°F and 2 afternoons past 90°F in a typical year. Snowfall averages about 4 inches. For a 2,000 sq ft house, this climate points to a heating load somewhere near 55,000 BTU/h. Treat that as a starting number. A Manual J calculation will move it up or down based on insulation and windows.
| Heating degree days / year | 4,482 |
|---|---|
| Cooling degree days / year | 210 |
| Nights at or below 32°F | 25 |
| Days above 90°F | 2 |
| Average low / high | 45.7°F / 60.8°F |
Bellevue Housing Stock
Census figures put the median build year in Bellevue at 1981, so a typical house here has about 45 years on it. A lot of these homes are on their second or third system by now. The ductwork is usually original, and leaky joints are common. Owners live in 51.9% of occupied homes, roughly 32,000 households. With a median household income of $161,300 and a median home value of $1,203,100, local labor rates come out above the national middle in our model.
NOAA's Storm Events Database shows no hail or damaging-wind days for King County from 2020 through 2025, so storm damage to outdoor units is rare here.
When Replacement Makes Sense
- The pilot or ignition keeps failing
- The boiler is 20 to 30 years old or more
- Fuel bills keep going up
- Some radiators stay cold
What Moves the Price
- Fuel type: gas, oil or propane
- A new chimney liner or venting
- A combi boiler that also makes your hot water
- Condensing or non-condensing boiler
- Pumps, zone valves and the piping around the boiler
For Bellevue we raised the national figures about 48%, based on local income, home values and climate-based equipment sizing. Get at least three written quotes; real bids can land outside this range.
What the Quote Should Cover
- The new boiler and the piping around it
- Flushing and refilling the system
- Removing the old boiler
- Startup and safety tests
- Venting and fuel hookups
Washington Permits, Efficiency Rules and Rebates
Washington falls in the DOE's North region. New split central air conditioners must meet at least 13.4 SEER2, and heat pumps sold anywhere in the U.S. need 14.3 SEER2 and 7.5 HSPF2. Expect the contractor to pull a mechanical permit for a replacement job in Bellevue. If a bidder suggests skipping it, move on. Also ask for a Washington license or registration number and proof of insurance. The federal 25C tax credit ended for equipment installed after December 31, 2025, so incentives now come mostly from utilities and state programs. Check your electric and gas utility's rebate page before you pick equipment.
Before You Hire
- Ask for a heat-loss calculation. A lot of old boilers are much bigger than the house needs.
- A combi boiler frees up space and replaces your water heater.
- For a steam system, hire a contractor who works on steam regularly.
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Boiler Replacement Questions from Bellevue Homeowners
How much is boiler replacement in Bellevue?
Plan on $8,200 to $18,500, with most jobs near $13,900. Equipment efficiency, house size and the condition of the ducts and wiring decide where your quote falls.
When is the best time to schedule boiler replacement in Bellevue?
Between late spring and early fall. Bellevue averages 25 freezing nights a year, and heating calls spike from November through February.
How long does a boiler last?
A cast-iron boiler can last 25 to 35 years. A modern condensing boiler usually lasts 15 to 20 with yearly service.
Can I replace a boiler with a heat pump?
Yes, with an air-to-water heat pump or a ductless system. The radiators may need upgrading, because heat pumps run cooler water than boilers.
Boiler Replacement Near Bellevue
Sources: U.S. Census Bureau ACS 5-year estimates 2019-2023 and 2024 population estimates; NOAA NCEI U.S. Climate Normals 1991-2020, station Seattle Sand Point Wsfo; NOAA Storm Events Database 2020-2025, King County. Prices are our estimates, not contractor quotes. Updated 2026.