Heating & Cooling

Boiler Replacement in Manchester, NH

Manchester is the heaviest boiler town we work in. What replacement costs here, and what a mill-era steam or hot water system changes about the job.

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What boiler install costs in Manchester, NH

$11,900 to $18,000

The middle half of the 37 boiler replacements we completed in Manchester, as of October 2026. A quarter came in under $11,900 and a quarter ran above $18,000.

That is our own job history in Manchester, NH, not a national average and not a teaser price. It excludes sales tax. We publish it because you cannot plan around "call for pricing," and because a number we have to stand behind keeps us honest. Your quote is fixed before any work starts, and what moves it is covered below.

We replace more boilers in Manchester than anywhere else we work

Thirty-seven single-boiler replacements in this city is the largest population behind any price band we publish. That is not an accident of marketing. Manchester housing was built when hydronic heat was the default, and a lot of it still has the original distribution: cast iron radiators, one-pipe steam in the older multifamily, and copper baseboard in everything added after the war.

It also means the band is wide for an honest reason. A straightforward hot water boiler swap in a single-family house and a steam replacement in a three-decker are different jobs, and both are inside the number.

Steam and hot water are not the same job

If your radiators hiss and have a vent on the side, you are on steam. Steam boilers have to be sized to the connected radiation, meaning the actual square footage of all your radiators, not to a heat loss calculation. Get that wrong in either direction and the system either never satisfies or short-cycles and hammers. It is the one place in heating where the old method is still the right method, and it is also where most of the bad steam jobs in this city come from.

Hot water systems are sized to heat loss like anything else, and there the old nameplate is usually far too big. A house heated by a 180,000 BTU boiler in 1970 has often had insulation, windows or a roof done since and needs a good deal less.

Near-boiler piping is where money is either well spent or wasted

The boiler is a box. The piping around it is the system. On steam, the header has to be piped the way the manufacturer draws it or the boiler carries water over into the mains and you get wet steam, banging, and a unit that fails early. On hot water, primary-secondary piping and correctly sized circulators are what let a modern condensing boiler actually condense instead of running hot and returning hot, which throws away the efficiency you paid for.

This is the hardest part of a quote to compare, because it is invisible once the jacket is on. When one quote comes in several thousand dollars below the rest, this is usually what has been left out of it.

What moves the price

Steam versus hot water. Steam work is slower, the piping is heavier, and the sizing method is different.
Cast iron versus condensing. A condensing boiler costs more and needs sidewall venting and a condensate drain, but it can modulate. With the right distribution it earns the difference back. With high-temperature cast iron radiation it often will not, and we will say so.
Domestic hot water. If the old boiler also made your hot water through a tankless coil, replacing it means choosing between an indirect tank and a standalone water heater. That decision moves the price by thousands.
Chimney. Taking a boiler off a masonry chimney often orphans the water heater still venting into it, which then needs a liner.
Access. Getting a cast iron sectional boiler out of a mill-house basement through a narrow bulkhead is real labour.

Rebates, and what changed for 2026

The federal 25C energy-efficiency tax credit expired at the end of 2025, so there is no federal credit on a 2026 boiler. That is worth knowing before a salesperson tells you otherwise. New Hampshire incentives run through NHSaves, the joint programme of the state utilities, and the amounts move between programme years. We confirm what is actually live on the day we quote rather than printing a figure here that is stale by the time you read it.

How replacement day runs

Most boiler replacements here are one to two days. We drain the system, cut out the old unit, set the new one, rebuild the near-boiler piping to the manufacturer drawing, run venting and condensate, wire the controls, then refill, purge and balance. Commissioning is not optional: we check combustion with an analyser, set the curve or the pressuretrol, and leave you the readings. If we touched the chimney, that gets inspected too.

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