Boiler Cost Estimate and Replacement Calculator
Create a boiler cost estimate and see how much it costs to replace a boiler in a house by heat load, boiler type, fuel and AFUE efficiency, hydronic distribution, replacement trigger, venting, piping, controls, removal, permits, and timing before comparing HVAC contractor bids.
At a glance
Per project before contractor-specific scope and site conditions.
These inputs move the estimate before local labor, access, permits, and project conditions.
Ask contractors to separate included work, allowances, exclusions, and change-order rules.
Estimate your project cost
Use this boiler cost estimate to compare how much it costs to replace a boiler in a house. Pricing depends on home size and heat load, hot-water versus steam boiler type, fuel source, AFUE efficiency, combi or high-efficiency equipment, radiator zones, circulators, repair-versus-replace urgency, near-boiler piping, chimney liner or direct venting, controls, permits, old boiler removal, and emergency winter timing.
- Carbon monoxide alarms and boiler safety detectors
- Radiator bleed keys and hydronic valves
- Hydronic pipe insulation and fittings
- Boiler water treatment and test kits
- Boiler thermostats and controls
- Hydronic expansion tanks and valves
- Boiler pressure gauges and safety valves
- Condensate neutralizers and drain pumps
Project questions this estimate answers
Use these checkpoints to keep the estimate tied to the scope a contractor will actually price.
- Boiler cost estimate
Separate boiler type, fuel, AFUE efficiency, venting, near-boiler piping, controls, and radiator-zone work before comparing replacement bids.
- Boiler replacement cost
Check whether the replacement price includes heat-load sizing, old-boiler removal, permits, startup, safety controls, and included hydronic components.
- Boiler replacement cost calculator
Use heat load, boiler type, fuel, distribution zones, replacement trigger, and permit timing to turn a broad boiler replacement range into a quote-ready scope.
- How much does it cost to replace a boiler in a house?
Use home size, heat load, steam-versus-hot-water scope, chimney liner needs, removal, permits, and winter timing to decide which bid assumptions match.
- How much to replace a boiler
Check whether the bid includes circulators, zone valves, expansion tank, condensate handling, pressure relief, and disposal so a lower price is not missing hydronic parts.
- Gas boiler replacement cost
Compare natural-gas standard AFUE, high-AFUE condensing, propane, chimney-liner, direct-vent, condensate-neutralizer, and gas-line update assumptions separately.
- Steam boiler replacement cost
Steam boiler bids should separate near-boiler steam piping, radiator pitch or venting corrections, low-water cutoff, pressure controls, and contractor experience with older systems.
Project supplies
Price-check related tools, parts, fixtures, filters, safety items, and materials before you buy or review a bid.
View full supply checklistProducts that may support this project
Related supplies
Use these links to check common product categories, then confirm what your contractor includes.
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Cost drivers to review
- Home size and heat load
- Boiler type
- Fuel and efficiency
- Distribution system
- Venting, piping, and controls
- Replacement trigger
- Removal, permits, and timing
How this estimate should work
- Start with current installed boiler replacement and boiler cost estimate ranges, then adjust by home size, heat-loss assumptions, BTU capacity, fuel type, and whether the project is a same-location swap or a larger hydronic update.
- Compare steam-versus-hot-water boiler scope because older steam systems can need different near-boiler piping, controls, radiator balancing, and contractor skill than hot-water baseboard or radiant systems.
- Separate AFUE tiers, standard cast iron boilers, high-efficiency condensing boilers, combi boiler domestic-hot-water scope, oil equipment, electric boilers, propane, and fuel conversion work before comparing unit prices.
- Use repair-versus-replace signals such as repeated no-heat calls, leaking sections, failed safety controls, unavailable parts, and efficiency upgrades to decide whether a boiler replacement bid is urgent or still comparison-shop ready.
- Price radiator zones, circulator pumps, zone valves, expansion tanks, air separators, pressure reducing valves, thermostats, smart controls, and hydro-air or radiant-floor distribution as separate bid lines.
- Flag chimney liner, direct venting, condensate drain, combustion-air, gas line, electrical, asbestos, permit, inspection, and old-boiler disposal work because those items can make two boiler bids look very different.
- Use boiler-versus-furnace and repair-versus-replace guidance when a homeowner is deciding whether hydronic comfort, radiator reuse, high-efficiency payback, or emergency no-heat timing justifies the replacement scope.
Cost examples
A planning example for smaller or simpler boiler replacement work with easier access, fewer upgrades, and limited prep.
A planning example around the starter range when home size and heat load, boiler type, and fuel and efficiency are near the middle of the project.
A planning example for larger, upgraded, or harder-to-access boiler replacement work with more site prep or coordination.
Boiler replacement cost by boiler type
| Boiler type | Planning range |
|---|---|
| Cast iron hot-water boiler | $3,850 - $15,200 |
| Standard gas hot-water boiler | $4,200 - $16,500 |
| High-efficiency condensing boiler | $5,100 - $20,100 |
| Combi boiler with domestic hot water | $5,700 - $22,400 |
| Steam boiler for older radiator system | $5,950 - $23,400 |
Boiler replacement cost by home size and heat load
| Home size and heat load | Planning range |
|---|---|
| Small condo or single hydronic zone under 1,200 sq ft | $2,850 - $11,200 |
| 1,200 to 2,000 sq ft standard home | $3,800 - $14,900 |
| 2,000 to 3,000 sq ft home or cold climate | $4,200 - $16,500 |
| 3,000+ sq ft or high heat-loss home | $5,400 - $21,100 |
| Multi-family, large custom, or multiple boiler zones | $6,500 - $25,600 |
Boiler replacement cost by fuel and efficiency
| Fuel and efficiency | Planning range |
|---|---|
| Natural gas standard AFUE replacement | $4,000 - $15,700 |
| High-AFUE gas or propane upgrade | $4,850 - $19,000 |
| Oil boiler replacement | $5,200 - $20,500 |
| Electric boiler | $3,800 - $14,900 |
| Fuel conversion or new gas service | $6,200 - $24,400 |
Boiler replacement cost by venting, piping, and controls
| Venting, piping, and controls | Planning range |
|---|---|
| Compatible venting, piping, and controls | $3,600 - $14,200 |
| Standard near-boiler piping and thermostat | $4,200 - $16,500 |
| New venting, chimney liner, or condensate handling | $5,400 - $21,100 |
| Major piping, controls, combustion air, or asbestos coordination | $6,650 - $26,100 |
Common questions
How much does boiler replacement cost?
A typical boiler replacement planning range is $4,200 - $16,500 per project. Final pricing depends on home size and heat load, boiler type, fuel and efficiency, distribution system, local labor rates, access, permits, and project conditions.
What changes a boiler replacement estimate the most?
The biggest changes usually come from project scope, especially home size and heat load, boiler type, fuel and efficiency, distribution system. Contractor availability, code requirements, site access, disposal needs, and regional cost pressure can also move the final quote.
How should I compare boiler replacement bids?
Ask each contractor to price the same scope, materials, timeline, cleanup, warranty, and permit assumptions. Then compare what is included, what is excluded, and how each quote handles surprises.
What should I enter in a boiler cost estimate calculator?
A useful boiler cost estimate calculator should account for home size, heat load, boiler type, fuel, AFUE efficiency, hot-water versus steam distribution, radiator or radiant zones, circulators, venting, chimney liner or direct-vent work, near-boiler piping, controls, old-boiler removal, permits, and emergency replacement timing.
How much does it cost to replace a boiler in a house?
A boiler replacement planning range is usually $4,200 - $16,500 per project on GetCosts.com before contractor-specific site conditions. Home size, heat load, boiler type, fuel, venting, piping, controls, old-boiler removal, permits, and emergency timing can move the estimate up or down.
What should be included in a boiler cost estimate?
A useful boiler cost estimate should separate equipment, labor, old boiler removal, near-boiler piping, circulators or zone valves, expansion tank, pressure relief, venting or chimney liner work, condensate handling, controls, permits, inspection, cleanup, and warranty assumptions.
Does steam boiler replacement cost more than hot-water boiler replacement?
Steam boiler replacement can cost more when the bid includes near-boiler steam piping, radiator venting corrections, low-water cutoff, pressure controls, and contractor experience with older radiator systems. Compare steam and hot-water bids separately instead of treating them as the same boiler replacement scope.
Why can boiler replacement quotes differ so much?
Boiler replacement quotes can differ when one contractor includes heat-load sizing, near-boiler piping corrections, circulators or zone valves, chimney liner work, condensate neutralizer, controls, radiator balancing, permits, old-equipment haul-off, or emergency winter scheduling while another bid treats those items as exclusions or allowances.
More project types
Browse related cost guides when this project overlaps with another trade or quote.
Compare contractor bids
Often included
- Labor and standard materials for boiler replacement.
- Basic site preparation, cleanup, and disposal assumptions.
- Standard contractor scheduling and project coordination.
May cost extra
- Changes related to home size and heat load, boiler type, fuel and efficiency, or distribution system.
- Permits, code upgrades, access issues, repairs, haul-off, or special-order materials.
- Scope changes discovered after the contractor inspects the site.
Confirm before hiring
- Whether the bid is fixed-price, allowance-based, or subject to site conditions.
- What is excluded, what could trigger a change order, and how surprises are priced.
- Warranty terms, payment schedule, start date, and cleanup responsibilities.
When to request quotes
Use the estimate after you know home size and heat load, boiler type, fuel and efficiency, and distribution system well enough to compare the same scope across contractors.
Good time to ask
- You can describe home size and heat load, boiler type, fuel and efficiency, and distribution system without guessing.
- You have photos, measurements, or notes that show the current boiler replacement scope.
- You are ready to ask at least two contractors for the same included work, exclusions, warranty, and change-order rules.
Wait until you know more
- The project scope may change after an inspection, repair decision, insurance review, or permit requirement.
- You are still deciding between boiler replacement options that would create different material, labor, or access needs.
Before you request quotes
Use these questions to describe your project clearly and compare contractor bids against the same assumptions.
Quote comparison worksheet- What is included in a boiler replacement quote, and what would be billed separately?
- How does home size and heat load change labor, materials, disposal, or timeline?
- How does boiler type change labor, materials, disposal, or timeline?
- How does fuel and efficiency change labor, materials, disposal, or timeline?
- How does distribution system change labor, materials, disposal, or timeline?
- Which assumptions should stay the same when comparing boiler replacement bids?