Boiler Replacement Cost in Denver, Colorado
Boiler replacement in Denver runs about $12,800 for a typical job. Basic installs start near $7,500. High-efficiency equipment with duct or electrical work can reach $17,100.
Denver Weather and HVAC Load
Denver logs 5,764 heating degree days and 813 cooling degree days in a normal year, based on the closest NOAA weather station. Heating is the bigger job here, and furnaces and heat pumps in Denver put in far more hours than the air conditioner. A normal year brings 156 nights at or below freezing and 42 days over 90°F. Snowfall averages about 49 inches. For a 2,000 sq ft house, this climate points to a heating load somewhere near 60,000 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 | 5,764 |
|---|---|
| Cooling degree days / year | 813 |
| Nights at or below 32°F | 156 |
| Days above 90°F | 42 |
| Average low / high | 36.5°F / 66.2°F |
Denver Housing Stock
Half the homes in Denver were built before 1974 (Census ACS median), so the typical house is about 52 years old. 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 49.1% of occupied homes, roughly 162,000 households. Homes here have a median value of $586,700 and households a median income of $91,681. Those two numbers drive the labor adjustment in our estimate.
Between 2020 and 2025, NOAA's Storm Events Database logged 15 hail days and 14 days with damaging thunderstorm winds in Denver County. The largest hail reported was 2.75 inches across. Hail flattens the thin aluminum fins on condenser coils and cuts airflow. After a big storm, take a look at the outdoor unit; homeowners insurance often covers the damage. Denver County also had 2 tornado days in that period.
When Replacement Makes Sense
- Leaks, rust, or pressure that keeps dropping
- Fuel bills keep going up
- Some radiators stay cold
- The pilot or ignition keeps failing
What Moves the Price
- 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
- Fuel type: gas, oil or propane
For Denver we raised the national figures about 36%, 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
- Venting and fuel hookups
- Removing the old boiler
- The new boiler and the piping around it
- Startup and safety tests
- Flushing and refilling the system
Colorado Permits, Efficiency Rules and Rebates
Colorado 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. Equipment replacements in Denver generally need a mechanical permit, and a reputable contractor will pull it for you. Ask for their Colorado license or registration number and a certificate of insurance with the quote. 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
- A combi boiler frees up space and replaces your water heater.
- Ask for a heat-loss calculation. A lot of old boilers are much bigger than the house needs.
- For a steam system, hire a contractor who works on steam regularly.
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Boiler Replacement Questions from Denver Homeowners
How much is boiler replacement in Denver?
Plan on $7,500 to $17,100, with most jobs near $12,800. 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 Denver?
Between late spring and early fall. Denver averages 156 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 Denver
- Aurora $6,900 to $15,700
- Colorado Springs $6,800 to $15,600
- Fort Collins $7,200 to $16,400
- Lakewood $7,300 to $16,600
Sources: U.S. Census Bureau ACS 5-year estimates 2019-2023 and 2024 population estimates; NOAA NCEI U.S. Climate Normals 1991-2020, station Denver-Stapleton; NOAA Storm Events Database 2020-2025, Denver County. Prices are our estimates, not contractor quotes. Updated 2026.