Home > Calculators > HVAC > Boiler Replacement Cost Calculator
Boiler Replacement Cost Calculator
This free boiler replacement cost calculator gives you a planning estimate for swapping an old boiler for a new one. Choose a gas, oil, electric, combi or steam boiler, then set the home size, efficiency level, venting, fuel connection and piping work. You will see a cost breakdown with Budget, Standard and Premium project levels, including removal of the old boiler, in about two minutes.
Loading the boiler replacement calculator…
Request Quotes From Licensed HVAC Contractors
Use the estimate above as your planning budget, then request quotes from licensed HVAC and boiler contractors using the form below the calculator.
Lead form — to be connected: Universal lead form placeholder: — Fluent Form ID unverified. Visible fields when connected: full_name, email, phone, zip_code, project_notes, contact_consent. Hidden fields: calculator_name, service, sub_service, estimate_low, estimate_standard, estimate_premium, material_cost, labor_cost, removal_cost, disposal_cost, permit_cost, equipment_cost, additional_cost, calculator_inputs, page_url.
The form stays hidden until a calculation succeeds, when connected. Photos of the old boiler and its data label, the chimney or vent, and the piping around it help contractors quote more accurately.
Calculator Introduction
Answer a few quick questions about your boiler replacement and the calculator estimates your cost in four steps: Location & Boiler Type, Venting, Fuel & Piping, Options and Labor Market & Timing. A ZIP code is required so we can match your request with local licensed professionals. It does not change the price. Only the questions that matter for your project are shown, and every setting has a sensible default, so you can get a first estimate in under a minute and then fine-tune.
Result Explanation
Your result shows an Estimated Project Budget, which is the Standard estimate, together with a typical range from Budget to Premium.
Budget
Budget assumes a basic boiler line and lean labor.
Standard
Standard assumes a mid-grade boiler, quality fittings and controls and a licensed installer at typical rates. This is the best number to plan around.
Premium
Premium assumes a premium boiler, higher-grade parts and premium service.
Below the headline number you will see a category breakdown, a line-item table for all three project levels, and a tip based on your selections. Results update automatically if you change an input after calculating.
Cost Breakdown Explanation
The breakdown only shows categories that apply to your project, so you will not see empty $0 rows.
Materials: the boiler, valves and fittings, system fill and treatment, vent or chimney liner, fuel or electrical work, piping and controls and any upgrades you select.
Labor: installer time for the boiler, venting, piping, startup and combustion testing.
Removal & Disposal: draining and removing the old boiler, plus hauling and recycling.
Permit / Inspection: an optional allowance only. Real fees are set by your city or county.
Additional Costs: an electrical panel allowance for some electric boilers, and an urgent or after-hours service premium when selected.
Asbestos abatement, new radiators or baseboard, rebates and finish work are not included.
This calculator provides a planning estimate only. It is not a quote, bid or guaranteed price. Actual contractor pricing may vary based on location, site conditions, equipment choice, labor market and project complexity. Permit and electrical panel amounts shown are allowances, not municipal or utility fees. Asbestos abatement, new radiators or baseboard, rebates and finish work are not included.
How Much Does Boiler Replacement Cost?
Boiler replacement typically costs about $6,000 at the Standard level for a standard-efficiency gas hot-water boiler in a 2,000 to 2,500 square foot home, and about $3,800 to $9,800 across the Budget to Premium range. A high-efficiency condensing boiler costs more, and an electric boiler costs less.
This calculator uses the following planning figures for a boiler of about 105,000 BTU/h output, a reused flue, existing piping, removal of the old boiler, a permit allowance and an average labor market:
| Boiler | Budget | Standard | Premium |
|---|---|---|---|
| Gas hot-water (standard efficiency) | $3,835 | $6,045 | $9,795 |
| Oil-fired | $4,570 | $7,125 | $11,540 |
| Electric | $2,675 | $4,300 | $7,080 |
| Gas combi (heat and hot water) | $4,465 | $7,160 | $11,715 |
| Gas steam | $4,975 | $7,920 | $13,045 |
Change any input and the numbers update, because the calculator prices the boiler, venting, piping, labor, removal and permit separately.
Images: No images were supplied for this page. Doc image suggestions, with alt text, are: Old cast iron boiler in a basement before replacement; New wall-hung condensing gas boiler with PVC vent; Boiler near-piping with a circulator pump, air separator and expansion tank; Stainless steel chimney liner being installed; Technician testing boiler combustion with an analyzer; Boiler replacement cost by fuel type infographic. No images were uploaded and none were invented.
How This Boiler Replacement Calculator Works
Choose the boiler. Pick gas, oil, electric, combi or steam.
Choose size and efficiency. Select your home size and, for gas and combi boilers, the efficiency level.
Describe the install. Tell us about the vent or chimney, the fuel or electrical connection and the piping and controls.
Pick options. Select any upgrades you want, such as an indirect hot-water tank.
Set your labor market and timing. Choose the market that matches your area and whether the work is urgent.
The calculator then prices equipment and labor at planning rates and shows three project levels. Your ZIP code is used to match your request with local HVAC and boiler contractors. It does not change the price.
What Affects Boiler Replacement Costs?
Boiler type and fuel
A gas hot-water boiler is the most common replacement. An oil-fired boiler costs more because of the burner and the oil system. An electric boiler has no flue or gas line and costs less to install, though it can cost more to run. A combi boiler heats the home and the hot water from one unit. A steam boiler serves steam radiators and has extra safety controls.
Home size
The calculator maps home size to boiler output from about 45,000 to 170,000 BTU/h. For a standard-efficiency gas boiler at the Standard level, the estimate is about $5,220 for a home up to 1,000 square feet, about $5,495 for 1,000 to 1,500 square feet, about $6,045 for 2,000 to 2,500 square feet, about $6,460 for 2,500 to 3,500 square feet and about $6,940 for a home over 3,500 square feet. An installer should size the boiler with a heat-loss calculation, and not by square footage alone.
Efficiency level
A standard-efficiency boiler runs at about 80 to 85 percent AFUE. A high-efficiency condensing boiler runs at about 90 to 95 percent and costs more up front. A premium modulating condensing boiler runs at 95 percent or more. At the Standard level, a high-efficiency gas boiler is about $9,230 and a premium one is about $10,735. A gas combi boiler at the high-efficiency level is about $10,780.
Venting and the chimney
A standard-efficiency boiler uses the existing flue or chimney when it passes inspection. A new stainless chimney liner raises the Standard gas estimate to about $7,445. A condensing boiler uses a PVC vent and an air intake through a wall or the roof, and a condensate drain. A long vent run or a roof exit raises the high-efficiency Standard estimate to about $9,830.
Fuel and electrical connection
A gas boiler may need the gas line extended or resized, which raises the Standard estimate to about $6,570. An oil boiler may need a new tank and lines, and a new tank raises the Standard oil estimate to about $8,545. An electric boiler can draw a large amount of power. A new heavy-duty circuit raises the Standard electric estimate to about $5,220, and a panel upgrade allowance raises it to about $6,100. See also: Gas Line Installation Cost Calculator.
Piping, pump and controls
Existing piping is reused by default. New circulator pump and zone controls raise the Standard gas estimate to about $6,630. A new near-boiler piping package, with an air separator and an expansion tank, raises it to about $7,260.
Options
Options include an indirect hot-water tank, a power flush of the heating loop, a magnetic dirt separator, an outdoor reset control and carbon monoxide alarms. An indirect tank raises the Standard gas estimate to about $7,625, and a power flush raises it to about $6,465. Options appear only when they apply to the boiler you chose.
Removal and disposal
The old boiler is drained, disconnected, hauled away and recycled. The calculator includes this by default. Unchecking it lowers the Standard gas estimate from about $6,045 to about $5,555. Removal and disposal are priced as their own lines.
Permits
Many cities require a permit and an inspection for boiler replacement. The calculator includes a permit allowance of about $300 at the Standard level by default. If you remove it, the Standard gas estimate falls to about $5,745. The allowance is a planning placeholder, not the municipal fee.
Urgency
Urgent and after-hours calls carry a premium. The calculator adds 15% to labor for work within about 48 hours and 40% for emergencies. An emergency replacement raises the Standard gas estimate from about $6,045 to about $6,775, which is common when a boiler fails in winter.
Budget vs Standard vs Premium Boiler Replacement
The three project levels reflect real differences, not a simple multiplier:
Budget: a basic boiler line, a leaner labor rate and fewer labor hours.
Standard: a mid-grade boiler, quality fittings and controls and a licensed installer at typical rates.
Premium: a premium boiler, higher-grade parts, more thorough commissioning and premium service rates.
Use Standard as your main planning number, and the Budget-to-Premium range to see how much your choices can swing the result.
Repair vs Replace
Replacement can make sense when the boiler is more than about 15 to 20 years old, when the heat exchanger is cracked or leaking, when repairs keep adding up or when the unit is inefficient. If the boiler is newer and the problem is a single part, a repair may cost far less. Use the boiler repair calculator to compare the numbers before you decide.
Regional Pricing Differences
Boiler labor rates and permit practices vary across the country. Rather than guess from your ZIP code, the calculator lets you choose a labor market, from lower-cost areas to the highest-cost metro areas, and applies it to labor and removal. A highest-cost market raises the Standard gas estimate from about $6,045 to about $6,910. Equipment and materials are not adjusted.
DIY vs Hiring a Licensed Contractor
Replacing a boiler is not a DIY project. It involves gas or oil, venting, water pressure, electrical connections and combustion testing. Most areas require a licensed contractor and a permit. A mistake can cause carbon monoxide poisoning, a fire or a leak.
Questions to Ask Boiler Contractors
- Did you do a heat-loss calculation to size the boiler?
- Which brand and model numbers are in the quote, and what is the AFUE rating?
- Does the quote include venting, the chimney liner, the pump and the permit?
- Will you flush the system and add a dirt separator?
- How long is the warranty on the heat exchanger, parts and labor?
- Which rebates or tax credits does this model qualify for?
How to Avoid Unexpected Boiler Replacement Costs
- Get the chimney checked before you choose a boiler. A liner is a common surprise.
- Ask for a written scope that lists the equipment, venting, piping, removal and permit.
- Check for asbestos. Old boilers and pipe wrap can contain it, and abatement is not included in this estimate.
- Check rebates before you sign. Programs and eligible models change.
- Do not wait for a deep freeze. Emergency winter calls cost more.
Ready for a Real Quote?
Use the estimate above as your planning budget, then request quotes from licensed HVAC and boiler contractors using the form below the calculator. Photos of the old boiler and its data label, the chimney or vent, and the piping around it help contractors quote more accurately.
Quick Answers About Boiler Replacement Costs
How much does boiler replacement cost?
Boiler replacement commonly costs about $6,000 at the Standard level for a standard-efficiency gas hot-water boiler in a 2,000 to 2,500 square foot home, and about $3,800 to $9,800 across the Budget to Premium range.
What is a condensing boiler?
A condensing boiler captures heat from the exhaust gas that older boilers send up the chimney. It reaches about 90 to 95 percent efficiency, vents through plastic pipe and needs a drain for the condensate.
How long does a boiler last?
A boiler often lasts about 15 to 25 years, depending on the type, the water quality and how well it is maintained. Cast iron boilers tend to last longer than steel boilers.
How much more does a high-efficiency boiler cost?
In this calculator, a high-efficiency condensing gas boiler raises the Standard estimate from about $6,045 to about $9,230, which is an increase of roughly $3,200.
What is the biggest cost driver in boiler replacement?
The boiler type and efficiency level are the biggest drivers, followed by the home size, the venting and the piping work.
Boiler Replacement Cost FAQs
How much does boiler replacement cost?
In this calculator, a Standard estimate for replacing a gas hot-water boiler in a 2,000 to 2,500 square foot home is about $6,045, with a Budget to Premium range of roughly $3,835 to $9,795. The estimate includes the old boiler removal, a standard-efficiency boiler, fittings, a permit allowance and an average labor market.
How much does a high-efficiency boiler cost to install?
A high-efficiency condensing gas boiler raises the Standard estimate from about $6,045 to about $9,230, and a premium modulating condensing boiler raises it to about $10,735. A condensing boiler also needs a PVC vent and a condensate drain, and a long vent run raises the Standard estimate to about $9,830.
How much does it cost to replace an oil, electric or steam boiler?
At the Standard level, an oil-fired boiler costs about $7,125, an electric boiler about $4,300 and a gas steam boiler about $7,920. A gas combi boiler, which also heats water, costs about $7,160.
How much does boiler size change the cost?
A bigger home needs a bigger boiler and more labor. For a standard-efficiency gas boiler at the Standard level, the cost runs from about $5,220 for a home up to 1,000 square feet to about $6,460 for 2,500 to 3,500 square feet and about $6,940 for a home over 3,500 square feet. Your installer sizes the boiler with a heat-loss calculation.
Do I need a new chimney liner or vent?
Often. A new boiler can be a different size from the old one, and an old chimney can be too wide or damaged. A new stainless chimney liner raises the Standard estimate from about $6,045 to about $7,445. A condensing boiler uses a PVC vent instead.
How much do new piping, a pump and controls add?
New circulator pump and zone controls raise the Standard gas estimate to about $6,630. A full near-boiler piping package, with a primary and secondary loop, an air separator and an expansion tank, raises it to about $7,260. A power flush of the loop adds about $420.
Does the estimate include removing the old boiler?
Yes, by default. Removal includes draining the system, disconnecting the boiler, hauling it away and recycling it. Unchecking it lowers the Standard gas estimate from about $6,045 to about $5,555. Old boilers are heavy, so a team is usually needed.
Do I need a permit to replace a boiler?
Many cities require a permit and an inspection for boiler replacement. The calculator includes an allowance of about $300 at the Standard level, and removing it lowers the estimate to about $5,745. Real fees are set by your city or county.
Related Calculators
Ready to Plan Your Boiler Replacement Project?
Use this estimate to plan, then get quotes from licensed local HVAC contractors to confirm scope and price.
Find HVAC contractors near you
CTA MyListing URL unverified — the button currently links to the on-page lead-form section. This calculator provides a planning estimate only. It is not a quote, bid or guaranteed price.