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Water Heater Repair in Dover, NH

49% of households in Dover heat with gas. That is the strongest free clue to what kind of water heater is in your basement, and it decides which faults are even possible.

Answer first

In Dover the dominant heating fuel is gas, at 49% of households, which narrows what can be wrong before anybody opens a panel. It measures house heating, so it predicts the water heater rather than reporting it. Gas heaters go wrong at the burner end: pilot, thermocouple, control valve, flue.

Source: US Census Bureau, American Community Survey 5-year estimates, table B25040.

HeaterRelay is a referral service, not a contractor. We connect homeowners with independent contractors. Contractors are required to hold whatever credential their state or municipality demands. Every state page sets out who licenses plumbers there and where to check, so you can confirm before work begins. We carry out no work, we sell no equipment, we do not set prices, and we never charge homeowners anything — the contractors in our network pay us when we route them a call.

What Dover runs on

This is a mixed town with gas ahead. Do not assume the neighbor's diagnosis applies — a gas heater and an electric one share almost no failure modes.

Fuel	Share of households
Gas — mains and bottled	49%
Electricity	18%
Fuel oil and kerosene	27%
Everything else	6%

Figures from the US Census Bureau's American Community Survey, 5-year estimates, table B25040, 2023 release, covering 15,021 occupied housing units across Dover.

New Hampshire statewide runs 15 points higher on gas, so this town is not typical of it.

Read that as a strong indicator rather than a measurement of water heaters. The Census counts what heats the house; what heats the water usually follows it, and occasionally does not.

Which one do you have

The quick test is the top of the tank. A vent pipe means combustion; no vent means elements. The fuel decides the fault list, so start there rather than with the symptom.

From there the symptom decides the rest: none at all, not enough of it, a tank that rumbles, or water on the floor, which is the one that will not wait.

ZIP codes we route in Dover

03820
03821
03822

Nearby towns, and what they burn

Fuel is not uniform across a region. Five of the nearby towns we route lead on something other than gas, which is why a diagnosis that fits one town does not travel.

Gilmanton 55% fuel oil
Northwood 46% fuel oil
North Hampton 66% fuel oil
Somersworth 51% fuel oil
Durham 40% fuel oil

Know the fuel and the symptom? That is most of the call.Gas and electric heaters fail in almost entirely different ways, so saying which you have gets you to the right person faster. We route the call and never charge you for it. Whatever else is wrong in Dover, mention it while we have you.

Call (866) 871-2892