Water Heater Repair in Cambridge, MA
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Long winters and storm outages both take a toll here
Middlesex County homes need heat from October through May, eight months a year. That is most of the year for the water heater too, since it works alongside the furnace the whole time to keep up with the household's hot water use. The heating element or burner runs more often over those months, and that steady cycling is what wears out a thermostat or heating element before its time.
Winter storms bring a second risk. The county has logged 89 winter storms and 467 damaging wind events over the past ten years, and across Massachusetts about 1 in 10 households lost power for at least 24 hours in 2024. An electric water heater has no hot water until the power comes back, though it will come back on by itself once it does. A gas water heater with a standing pilot keeps running through the outage since it never drew power in the first place.
- 19°F
- the average winter night, and colder incoming water means longer heating
- 8 months
- October through May, the months homes here need heat
- 10%
- of Massachusetts households lost power for a day or more in 2024, and a heater with an electric element or electric ignition stops without it
NOAA nClimDiv, 1991–2020 normals
A new water heater would cut about $130 a year off hot water for a typical Massachusetts home.
Estimates for a typical Massachusetts home, compared with an older unit built to the federal minimum, from EIA household energy data and Massachusetts fuel prices. Your home will differ.
Repair makes sense when an element, thermostat or gas valve has failed.
Replacement makes sense when the tank itself is leaking.
- Why is my water heater leaking from the bottom?
- The most common cause is a failing tank that has rusted through from the inside, and once that happens the leak will not stop or seal on its own. It can also come from a loose drain valve, a failed temperature and pressure relief valve, or condensation on a gas unit that only looks like a leak. If the water is coming from underneath the tank itself, the tank needs to be replaced, not repaired. A contractor can check the valves and fittings first to rule those out before condemning the tank.
- Why won't the pilot light on my water heater stay lit?
- Most of the time this means the thermocouple has worn out and can no longer sense that the pilot is lit, so it shuts the gas off as a safety measure. It can also be a weak or dirty pilot orifice, a draft blowing the flame out, or a gas valve that is failing. A standing pilot does not run on electricity, so a power outage will not affect it. If the pilot won't hold even after relighting it a few times, the thermocouple or gas valve needs to be looked at by a contractor.
- Can a tankless water heater be repaired?
- Yes, most problems on a tankless water heater can be repaired rather than replaced. Common issues are a clogged inlet filter, a buildup of scale on the heat exchanger, a failed igniter, or an error code pointing to a specific sensor. Because these units depend on precise water flow and exhaust venting to fire correctly, a contractor needs to diagnose the actual fault rather than guess from the symptoms alone.