Updated 2026-09-30
Boiler replacement in New Hampshire replaces the appliance that heats water or steam for radiators, baseboard, or radiant floors. It is not a furnace job and it is not automatically a heat pump job. Call (603) 420-0791 with your ZIP code, the fuel, and whether the system is steam or hot water. An independent contractor quotes the replacement after seeing the near-boiler piping, the vent, and the radiation. Confirm license and insurance. This site does not install boilers.
Replacement is the conversation when sections leak, when the heat exchanger is done, when parts for a very old boiler are no longer a serious plan, or when you are converting fuel. It is the wrong conversation for a single failed circulator. Ask the contractor to separate those cases. When to repair or replace lists the questions. Furnace versus boiler explains the house types.
Piping, venting, and the indirect tank
A new boiler almost always means new near-boiler piping, air separation, and controls. Old zone valves and circulators may be reused only if the contractor says they are sound. An indirect water heater tied to the boiler is a common New Hampshire setup. If the tank is the same age as the boiler, ask whether the quote includes it. Leaving a rusty tank on a new boiler is a second project a year later.
Venting has to match the new boiler. Condensing boilers need a drain and a vent rated for flue gas condensate. Chimney liners come up on oil and on some gas jobs. An oil tank that is abandoned needs a plan. This site will not invent a tank-removal price. Ask for that line if it applies.
Heat pumps as the replacement
Some owners replace a boiler with a ductless or ducted heat pump and keep a small boiler, or remove the boiler entirely. That only works if the radiation is not your only heat and the heat pump can carry the design load, or if you accept backup. Read heat pump versus oil or propane and winter performance. Rebates do not make an undersized system a good idea. See rebates.
Typical cost factors
Fuel, steam versus hot water, vent and chimney work, indirect tank, electrical, and asbestos on old pipes change the quote. No typical installed range is published here. We do not have a cited New Hampshire source for boiler replacement cost across those cases. The contractor quotes after they assess the job. You confirm who pulls the local permit. People in photos are actors or models, not listed contractors.
Radiation you already own
The boiler is not the whole heating system. Cast-iron radiators, fin-tube baseboard, and radiant tubing each want different water temperatures. A new condensing boiler that is piped like an old cast-iron boiler may never condense, which means you paid for efficiency you will not get. Ask the contractor whether the existing radiation can run at the lower temperatures a condensing boiler needs, or whether the design keeps higher temperatures and accepts the efficiency that follows. That is a technical answer you should hear in plain words.
Also ask about freeze protection if the house is a seasonal camp that sits empty. Glycol, drained loops, and a heat pump instead of a boiler are different projects. A Laconia cottage and a Concord colonial should not get the same proposal with the town name swapped. Your quote should mention the building it was written for.
Ask what stays on the wall. Old zone valves, old circulators, and old black-iron piping near the boiler are often replaced because they will fail next, not because they failed today. That is legitimate if it is listed. It is not legitimate if it appears only after the old boiler is gone. Ask about combustion air too. A new sealed boiler in a tight mechanical room may need a vent the old atmospheric boiler never had. If the room also contains a clothes dryer, say so. Dryers and boilers fighting over air is a classic New Hampshire basement problem, and it should be designed out, not discovered on the inspection.
Ask who pulls the permit and whether the town inspects hydronic work. Put the answer on the quote. If the house will be empty during the swap, ask how long the pipes can sit cold and what you should drain. A replacement that ignores a vacant house over a cold weekend is how a boiler job becomes a burst pipe. Mention the vacancy when you call so the contractor can plan the day, not discover it after the old boiler is already disconnected.
Guides
Cities
Same service, with the housing and fuel notes for that city. Boiler replacement in Manchester · Boiler replacement in Nashua · Boiler replacement in Concord · Boiler replacement in Portsmouth · Boiler replacement in Dover · Boiler replacement in Derry · Boiler replacement in Salem · Boiler replacement in Laconia
Questions people ask
Who does the boiler replacement work?
An independent contractor, not New Hampshire HVAC Connect. This site connects the call. Confirm license and insurance before work starts.
How much does boiler replacement cost?
The contractor quotes boiler replacement after they assess the job. This site does not print a price. Call (603) 420-0791 with your ZIP code.
What should I have ready?
Your ZIP code, what the system is doing, and the fuel type if you know it. Ask what the quote includes before you agree to the work.