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Boiler Replacement Cost in New Hampshire: Oil, Propane, and Gas Prices for 2026

Boiler replacement in New Hampshire costs $8,000 to $20,000 in 2026 depending on oil, propane, gas, or combi. See labor, chimney liners, conversions, and rebates.

Boiler Replacement Cost in New Hampshire: Oil, Propane, and Gas Prices for 2026

New Hampshire homeowners pay about $8,000 to $15,000 to replace a standard boiler in 2026, and $11,000 to $20,000 for a high-efficiency condensing unit or a combi boiler that also supplies hot water. Oil boilers sit at the upper end of the standard range because the burner, the oil filter, and the chimney work add labor. Those numbers are approximate and vary with the house, the fuel, and the contractor.

Oil is the story in New Hampshire. The state is among the most oil-dependent in the country, and outside the Manchester, Nashua, Concord, and Seacoast gas territories served by Liberty Utilities and Unitil, most homes burn heating oil or propane. That shapes the replacement decision in a way it does not in most states, since the choice is often between a new oil boiler, a switch to propane, or a jump to a heat pump with the boiler as backup.

Winters here are long. Concord averages more than 60 inches of snow, the North Country sees January lows below zero, and heating season runs from October into April. A boiler in New Hampshire works harder and longer than one in southern New England, which is why sizing, efficiency, and installation quality matter more than the sticker price.

Equipment Costs by Boiler Type

A standard cast iron oil boiler from a major manufacturer costs $3,500 to $6,000 for the unit itself. A gas or propane cast iron boiler is $2,500 to $4,500. Condensing gas or propane boilers, which capture more heat from the exhaust and run at 90% to 96% efficiency, cost $4,000 to $7,500 for the equipment.

Combi boilers that provide both heat and domestic hot water without a separate tank cost $3,500 to $6,500 for the unit. They save space and eliminate the water heater, which is why they have become common in Nashua and Manchester condos and in smaller homes across Hillsborough and Rockingham counties. In larger homes with high hot water demand, a boiler with an indirect tank is usually the better setup.

Steam boilers are rarer in New Hampshire than in Massachusetts but still show up in older homes in Manchester's mill district, Portsmouth's historic neighborhoods, and downtown Concord. A replacement steam boiler runs $4,000 to $7,000 for the unit and the installation is more specialized, with total costs of $9,000 to $16,000.

Labor and Installation in New Hampshire

Installation labor runs $3,000 to $6,000 for a straightforward boiler swap. The work covers draining the system, removing the old boiler, setting the new one, connecting supply and return piping, wiring the controls, connecting the fuel line, venting, and filling and purging the system. A two-person crew usually needs one full day, sometimes two for oil or steam.

Contractor rates vary by region. The Seacoast, from Portsmouth to Hampton, and the Nashua and Salem area near the Massachusetts line run the highest, with licensed technicians at $110 to $160 per hour.

Manchester and Concord are close behind. The Lakes Region, the Upper Valley, and the North Country run lower at $85 to $125 per hour, though there are fewer contractors and scheduling can take longer.

New Hampshire licenses gas fitters and oil heating technicians through the Office of Professional Licensure and Certification, and plumbers through the same office. A boiler installer working with gas or propane needs a gas fitter license, and oil burner work requires an oil heat technician license. Ask for the license number and check it, since unlicensed installations can void the manufacturer's warranty.

Chimney, Venting, and Piping Add-Ons

Oil boilers and standard gas boilers vent through a masonry chimney, and in many New Hampshire homes that chimney has never been lined. A stainless steel liner costs $1,200 to $3,000 and is often required when a new boiler is installed because the flue gases from modern equipment are cooler and more corrosive. Chimney inspection alone runs $150 to $400.

Condensing boilers vent through PVC or polypropylene pipe to a side wall, which avoids the chimney entirely but requires a condensate drain or pump. If the boiler room has no floor drain, expect $200 to $500 for a condensate pump and neutralizer. Old copper or black iron piping near the boiler is often replaced during the swap, adding $500 to $1,500.

Oil tank condition matters. New Hampshire has a large number of aging steel oil tanks, and an installer who finds a corroded or leaking tank will need to replace it before the new boiler goes in. A new 275 gallon tank installed costs $2,000 to $3,500, and a leak cleanup can cost far more, which is why some homeowners use the boiler replacement as the moment to leave oil behind.

Fuel Choice and the Conversion Question

Oil to propane conversions are the most common switch in areas without natural gas. A propane boiler is cheaper than an oil boiler, propane burns cleaner, and it eliminates the oil tank. The conversion adds $1,500 to $4,000 for the propane tank installation and gas piping, so a full oil-to-propane boiler replacement lands at $10,000 to $17,000.

Oil to natural gas is available only where Liberty or Unitil has mains, which covers Manchester, Nashua, Concord, Keene, Portsmouth, Dover, and parts of the surrounding towns. The utility sometimes installs the service line at reduced cost when a customer converts, and the ongoing fuel savings are large. Total conversion cost, including the boiler, runs $9,000 to $16,000.

Heat pumps are the third path, and NHSaves rebates make them worth a look. A cold-climate ductless or ducted heat pump system costs $12,000 to $25,000 depending on the number of zones, and many New Hampshire homeowners keep the old boiler as backup for the coldest weeks rather than replacing it at all. Eversource, Liberty, Unitil, and the New Hampshire Electric Co-op all offer heat pump incentives, and the federal tax credit covers 30% of the cost up to $2,000.

Rebates and Tax Credits in New Hampshire

NHSaves, the joint utility efficiency program, offers rebates on high-efficiency boilers for gas and propane customers. Condensing boilers at 95% AFUE or higher typically qualify for $500 to $1,000, and combi units and indirect tanks sometimes carry additional incentives. Oil customers do not get NHSaves boiler rebates because oil dealers are not part of the program.

The federal energy efficiency tax credit covers 30% of the cost of a qualifying boiler up to $600 for gas and propane units that meet the current efficiency threshold. Oil boilers can qualify if they are rated for a blend of biodiesel or renewable fuel. This credit stacks with the utility rebates.

Income-qualified households can get free or low-cost boiler replacement through the state's Weatherization Assistance Program and the Fuel Assistance Program administered by the community action agencies in each county. The waiting list is long in winter, so applying in summer is the better move.

When to Replace Rather Than Repair

A boiler past 20 years with a repair estimate over $1,500 is usually a replacement. Common tipping points include a cracked section on a cast iron boiler, a failed heat exchanger, and repeated ignition or burner problems on an oil unit. A leaking boiler section cannot be reliably patched.

Efficiency is the second argument. An oil boiler from the 1990s runs at 75% to 80% efficiency, and a modern unit reaches 87% for oil or 95% for condensing gas and propane. On a New Hampshire home burning 800 gallons of oil per year, that difference saves $300 to $700 annually at recent prices, which covers a large part of the replacement cost over the boiler's life.

Homeowners can compare quotes from the heating contractors listed for their county on New Hampshire Businesses Near Me, and the heating and home service cost guides on the blog cover related projects like heat pump conversions and oil tank replacement. Three written quotes with the same scope is the standard advice, and it holds especially in the North Country where contractor supply is thin.

Frequently Asked Questions

How much does an oil boiler replacement cost in New Hampshire?

An oil boiler replacement runs $8,500 to $15,000 installed in 2026, including the boiler, labor, and basic venting. Add $1,200 to $3,000 if the chimney needs a liner and $2,000 to $3,500 if the oil tank needs replacement.

Is a combi boiler a good choice for a New Hampshire home?

For homes under about 2,000 square feet with one or two bathrooms, a combi boiler works well and saves the cost of a separate water heater. Larger homes or households with high simultaneous hot water use do better with a boiler and an indirect tank, since combi units can struggle with two showers running at once in a cold-water climate.

How long does a boiler last in New Hampshire?

Cast iron boilers typically last 25 to 35 years with regular maintenance, and oil boilers often reach 30 years. Condensing boilers have shorter lifespans of 15 to 20 years because of the more complex heat exchanger. Annual cleaning and tuning, which costs $150 to $300, is the main factor in how long any of them lasts.

Do I need a permit to replace a boiler in New Hampshire?

Most cities and towns require a mechanical or plumbing permit and an inspection, including Manchester, Nashua, Concord, Portsmouth, and Dover. Some smaller towns have no building inspector and rely on the state licensing of the installer. Gas and propane connections always require a licensed gas fitter regardless of the permit.

Should I replace my boiler in summer or winter?

Summer and early fall are better for planned replacements. Contractors have more open schedules from May through September, and pricing is often lower than during a winter emergency when a no-heat call gets the first available crew at premium rates. Ordering the boiler in spring also avoids the equipment shortages that sometimes hit in November.