Water Heater Replacement in Londonderry
Get fast, fair pricing from licensed local pros. Typical Londonderry cost: $1.1k – $2.6k installed.
- Tank, gas
- $1.1k – $2.6k
- Tank, electric
- $950 – $2.3k
- Tankless, gas
- $2.8k – $5.6k+
- Heat pump hybrid
- $2.3k – $5.1k
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Water heater replacement cost by type.
Installed prices for Londonderry, adjusted for local labor. Larger tanks and code upgrades move the number up.
In Londonderry, New Hampshire, water heater replacement costs range from $750 to $3,700+ depending on type, with tank gas units typically $750–$1,850, tank electric $850–$2,100, tankless $1,400–$3,300+, and heat pump models $1,700–$3,700. The median home was built in 1983, meaning many homes have aging units that may need replacement. New Hampshire requires a state-licensed plumber, a permit, and an inspection for any water heater replacement. The cold northern climate and cold winter inlet water put extra demand on heaters, making efficiency a key consideration. Heat pump water heaters are a strong fit for Londonderry homes, as they qualify for the federal 25C tax credit (30%, up to $2,000) and perform well in the area's mostly electric-heated homes.
- Tank, 40–50 gal gasThe default for most US homes$1,100 – $2,600
- Tank, 40–50 gal electricNo venting required$950 – $2,300
- Tankless, gasEndless hot water, higher BTU gas line often needed$2,800 – $5,600+
- Hybrid heat pumpMost efficient, qualifies for federal credits$2,300 – $5,100
- Permit & disposalMost jurisdictions require it$45 – $325
* Cold-region homes may need extra insulation or larger tanks.
Water heaters in Londonderry
U.S. Census ACS- Households
- 4,857
- Homeowners
- 3,734
- 80% own
- Median home value
- $392,000
- Median income
- $113,557
- Median home built
- 1983
- Housing units
- 4,649
With a median home built in 1983, many Londonderry water heaters are at or past their 8–12 year lifespan — a common reason replacements spike here.
What’s different about Londonderry.
Generic cost pages skip the things that actually decide your price and your unit’s lifespan here — local code, water, and the money you can claim back.
Recommended unit for Londonderry
Given New Hampshire’s cold northern climate and electric water heating, heat-pump (hybrid) is the sensible default for most Londonderry homes. Winter inlet water runs cold here, so recovery rate matters — size up a tankless or favor a high-recovery tank. A pro can confirm the right size and fuel for your home.
Sources: NH Department of Energy - Home Electrification and Appliance Rebates · New Hampshire Plumbing Code 2018 (based on IPC 2018) - UpCodes · New Hampshire Plumbing Code Chapter 5 Water Heaters - UpCodes
What Londonderry code requires
Replacing a water heater in Londonderry follows New Hampshire rules under the International Plumbing Code (IPC), state-amended as the NH Plumbing Code. Here’s what applies statewide:
- PermitRequired
Pulled by your licensed plumber; covers gas/venting and the expansion tank.
- Seismic strappingNot required
No state strapping mandate — one less line on the bill.
- Expansion tankRequired on closed systems
Required where a pressure regulator or backflow preventer is present.
- Plumbing codeInternational Plumbing Code (IPC), state-amended as the NH Plumbing Code
- Good to know—
New Hampshire requires plumbing work, including water heater replacement, to be performed by a state-licensed plumber, with a permit and inspection.
Sources: NH Department of Energy - Home Electrification and Appliance Rebates · New Hampshire Plumbing Code 2018 (based on IPC 2018) - UpCodes · New Hampshire Plumbing Code Chapter 5 Water Heaters - UpCodes
Not sure which rules and rebates apply to your home?
A licensed Londonderry pro will walk you through code, the right unit, and what you can claim back — in one quick call.
No obligation — talk through your options.
Money back in Londonderry
New Hampshire water heating is mostly electric, which shapes the money back:
- StateUp to $1,750 (income-qualified; program launching mid-2026)NH Home Electrification and Appliance Rebates (HEAR) Program - heat pump water heater →
State-level program — verify eligibility before you buy.
- Federal30% of cost, up to $2,000Federal 25C tax credit →
For a qualifying ENERGY STAR heat pump water heater. Claimed on your federal return.
The federal 25C tax credit (30%, up to $2,000 for a heat pump water heater) applies in every state, including New Hampshire.
Ready to get your water heater fixed in Londonderry?
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- Same-day availability
- Upfront, no-pressure pricing
- Local pros near you
No obligation — talk through your options.
Hot water back in three steps.
- 1
Tell us what’s wrong
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- 2
Get matched with a local pro
We connect you with a licensed, insured water heater specialist near you — often the same day.
- 3
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Your pro confirms the price on-site and gets your hot water back. Most jobs done in a few hours.
Water Heater Replacement in Londonderry, explained.
What affects water heater replacement cost in Londonderry?
Prices vary by unit type: tank gas is generally more affordable than tankless or heat pump models. Labor costs reflect the need for a licensed plumber and permit fees. Older homes (median built 1983) may require upgrades to meet current NH Plumbing Code, such as an expansion tank on closed systems. The cold climate means heat pump units may need a backup or careful siting, which can add cost. Finally, the federal tax credit can offset heat pump prices, making them more competitive over time.
Common water heater issues in Londonderry
Sediment buildup
Hard water and older pipes can cause sediment to accumulate in the tank, reducing efficiency and shortening lifespan.
Cold inlet water
Londonderry's cold winters mean very cold incoming water, which can cause tankless units to struggle to reach desired temperatures if undersized.
Permit and inspection delays
New Hampshire requires a permit and inspection for water heater replacement; failing to obtain them can lead to fines or issues when selling the home.
Water Heater Replacement FAQs — Londonderry
Yes, New Hampshire requires a permit and inspection for any water heater replacement. A licensed plumber must pull the permit and schedule the inspection.
Water Heater Replacement near Londonderry
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