The shower runs cold one morning, or a thin line of water shows up at the base of the tank, and a decision you last made a decade ago is suddenly due. Before comparing new heaters, find out whether you need one. The failure point answers that first, and the heater's age second.
If you smell gas, don't troubleshoot. Leave the house and call 911 from outside. Plumbing service follows once the fire department or gas utility says it's safe.
Repair or replace? Start with the symptom
| What you notice | What it can point to | Where it tends to land |
|---|---|---|
| No hot water at all | Gas: the pilot, igniter, thermocouple or gas control. Electric: an element or thermostat | Often repairable |
| Hot water runs out fast or never gets hot enough | A failed element, a broken dip tube, a thermostat, or a tank too small for how the household uses water now | Depends on the cause |
| Rumbling or popping | Sediment or scale, sometimes a control problem | Service first; on an older tank, an early warning |
| Rusty or discolored hot water | A depleted anode rod, corrosion inside the tank, or the water supply itself | Diagnose before deciding |
| Water around the base | A drain valve, fitting, relief valve, nearby pipe or the tank body | Parts are often repairable; a tank-body leak is not |
| An error code on a tankless unit | Ignition, venting, flow, scale or condensate faults, which can overlap | A starting point, not a diagnosis |
Thermostats, elements, igniters, thermocouples and valves are usually worth repairing when the rest of the heater is sound. Steel tanks can't be patched, though, so a leak through the tank body usually calls for replacing the heater. With tankless equipment, the code, the model and the service history all shape the repair; our Navien error code 515 case study shows how.
Timing a hot water heater replacement
Three things push the decision toward replacement: a leak from the tank itself, an expensive repair on an old heater, and repairs that keep coming back. Past roughly ten years, we put the repair price and the replacement price side by side and let you weigh them, because a significant repair on an old tank can be money spent twice. Tankless changes that late-life math, since its heat exchanger is serviceable and, on many models, replaceable.
Replacing on your own schedule has one more advantage: you choose the type. An emergency swap tends to become whatever fits the existing gas line, vent and space that week.
How long does a hot water heater last?
There isn't one number. Storage tanks, gas or electric, commonly last somewhere around 8 to 12 years, but water chemistry, pressure, expansion control, the anode rod's condition, installation quality and how hard the tank works can move that in either direction. A newer tank can leak, and an older dry one isn't condemned by the calendar.
A condensing tankless unit that's descaled on schedule can reach 20 years or more. Hard water raises how often it needs descaling, and skipped maintenance shortens its life. Rather than guess from appearance, we read the date from the serial number, look at condition and service history, and can check water chemistry while we're on site when it bears on the decision.
Which type fits your home
Gas storage tank
Gas storage is often the practical choice in a home that already has gas service. A burner heats the tank and recovery is quick. A chimney-vented tank with a standing pilot can keep making hot water through a power outage; power-vented models need electricity.
The catch is usually the venting. If your chimney needs a stainless liner, that relining is chimney-contractor work outside our plumbing scope, and it can cost more than the heater. That one condition can make a power-vented heater the cheaper project. Our guide to gas water heater venting and replacement costs walks through that decision.
Electric resistance tank
Simple and quiet, with no combustion and no venting, so it fits where safe gas venting would be difficult. Its weakness is operating cost. A resistance element turns electricity into heat about one-to-one, which makes it the costliest of the four to run.
Hybrid heat pump
A hybrid moves heat from the surrounding air into the water instead of making heat directly, so it can use far less electricity than a resistance tank, as ENERGY STAR explains. It needs air around it, a condensate drain and a room where its cooler discharge air and sound are acceptable, and the selected model's installation instructions set the specifics. When it replaces an electric resistance tank, payback is roughly three to seven years after the rebate. Our heat pump water heater guide shows the arithmetic.
Tankless
A tankless unit heats water as it flows, so the supply is continuous and the floor space a tank used comes back. It isn't an energy-savings play, though. At our installed pricing, payback from fuel savings alone is at least eight years in the best case and commonly thirty to fifty. People choose tankless for continuous hot water, space and service life, and those are good reasons. Our tankless vs. tank comparison covers the long-term math.
How much is a water heater, installed?
These are Jeneral Plumbing's installed water-heater prices, plus a separate range for relining by a chimney contractor:
| Water heater type | Installed price |
|---|---|
| Standard electric resistance tank | From $2,300 |
| Gas storage, all vent types | $2,900 – $6,500 |
| Hybrid heat pump | Up to $7,800 before the $750 Mass Save discount (as of August 2026) |
| Condensing tankless | $8,500 – $11,000+ |
| Stainless chimney relining, where a flue needs it (by a chimney contractor) | $2,400 – $6,500 |
Where a project lands depends on the conditions, not the box: a chimney that needs lining, a gas line that needs upsizing, a new circuit, or a change in vent type. We quote a flat rate after seeing the installation, with the total and any fees shown for approval before work begins. Stepping up a gas vent tier for efficiency alone won't pay back within the equipment's life. Confirm current Mass Save eligibility before counting the discount; the program administrator makes the final call.
What a proper installation includes
In a hot water heater installation, the permits, the venting and an expansion tank where the system needs one matter as much as the heater. Massachusetts issues plumbing permits to licensed plumbers under 248 CMR 3.00, and the written scope names the permits and inspections your job needs. The vent has to suit the model and the house. When a check valve or pressure-reducing valve closes off the supply, heated water has nowhere to expand, and an expansion tank gives it room. The relief valve and its discharge piping get the same attention.
For storage tanks we install selected Bradford White and Rheem models, and for tankless we work with Navien, Rinnai and Noritz. Heat exchanger warranties differ by brand and model, and depend on use, registration and the manufacturer's current written terms, so we review the exact model's warranty document with you instead of quoting a brand-wide number. Jeneral Plumbing is owner-operated by a Licensed Master Plumber (MA #9628831-PL-M), Navien Service Specialist certified and factory trained by Navien, Rinnai and Noritz. In most cases, the licensed master plumber who evaluates your home is the one who performs the work.
Can you replace a water heater the same day?
Sometimes, but it's never promised in advance. It can happen when the right equipment is available, the existing fuel or electrical setup suits it, and the job doesn't uncover venting, chimney, gas-piping or circuit work. When it can't happen that day, we'll explain what's holding it up.
Scheduling a water heater visit
We install and repair water heaters from our Westford, MA base for homes across Middlesex & Worcester County. For regular-hours visits, there's an $80 dispatch fee — the cost of the visit, waived when you hire us for the work. Service Plan members also receive a waived dispatch fee on qualifying regular-hours visits. Off-hours, Sunday and holiday dispatch carries a separate $599 emergency callout fee. It's non-refundable and non-negotiable, collected prior to dispatch, covers the dispatch only, and is never applied to repair work.
If your heater is showing any of the signs above, call (978) 392-7789 to talk through what you're seeing. Our water heater installation and repair service explains how we compare demand, fuel, electrical service, venting and operating cost before recommending gas, electric, heat pump or tankless.
Written by Jeneral Plumbing.
This article was drafted with AI writing tools and edited before publication. AI tools did not inspect any job or validate technical conclusions.
Last updated .