Water Heater Guide for San Diego County and the Temecula Valley

How long should a water heater last here?

A tank water heater generally lasts 8 to 12 years, and closer to 8 to 10 in hard water. Most of our service area has hard to very hard water, so plan on the short end of that range unless the tank is flushed and the anode rod is kept up.

Hard water matters because heating it drops minerals out as sediment on the bottom of the tank. That layer makes the burner or elements work harder and holds heat against the steel. The district-by-district hardness figures are in our water system guide.

Tankless units can outlast a tank, but only with descaling. In water this hard that is a yearly job, and skipping it is the most common reason we see tankless heaters fail early or lose warranty coverage.

What are the signs a water heater is failing?

Rumbling or popping while it heats, hot water that runs out sooner than it used to, rusty hot water, and any moisture or rust at the base. Water coming from the tank itself means it is failing and should be replaced soon.

Some of those signs are cheap fixes. A rumble is usually sediment, which a flush may clear if it has not hardened. Hot water that suddenly runs short can be a broken dip tube or, on an electric tank, a failed lower element. A leak at a fitting or the relief valve line is a repair. A leak from the tank body is not.

If you find water at the base, shut off the cold supply at the top of the heater and turn the gas valve to pilot or switch off the breaker, then call. Our water heater repair and replacement page covers what we check first.

Should I repair my water heater or replace it?

Repair it when the tank is sound and a part has failed: a thermocouple, igniter, element, thermostat, dip tube or valve. Replace it when the tank itself leaks, or when it is near the end of its expected life and the repair would be a significant share of a new one.

Age matters as much as the symptom. A thermostat on a four-year-old tank is an easy repair. The same repair on a tank past ten years in hard water is money spent on something that is close to done anyway. We tell you which situation you are in before you spend anything.

Tank, tankless, gas, electric or heat pump: which one fits?

The right type depends on what the house already has and how you use hot water. A like-for-like tank is usually the simplest and least expensive swap; tankless and heat pump units can make sense, but each has requirements that rule it out in some homes.

Tankless gas units can need a larger gas line than the old tank did, plus new venting, and they need yearly descaling in hard water. Heat pump water heaters need room around them for air, an electrical circuit sized for them, and a spot where their sound and cool exhaust are not a problem. Switching from gas to electric or the reverse adds work of its own.

Sizing is about your busiest hour, not the number of people in the house: how many showers run back to back or at the same time, plus laundry or the dishwasher in that hour. The first-hour rating on the yellow EnergyGuide label tells you whether a tank keeps up.

What does a water heater replacement cost and involve?

Our water heater installation starts at $750 installed, with the unit, permit and haul-away included, and most tank replacements land between $750 and $2,500. Size, fuel type, venting and the code upgrades the install needs are what move the price.

A replacement means draining and removing the old unit, setting the new one to current code, connecting water and gas or power, filling and starting it, and arranging the permit inspection. Code items such as seismic straps and an expansion tank are part of doing it right. See our water heater installation pricing for what is included.

How do I make a water heater last longer?

Flush a tank once a year in hard water, check the anode rod every few years and replace it before it is gone, and descale a tankless unit on the schedule in its manual. Treating the water upstream keeps the sediment from forming in the first place.

Do not flush an old tank that has never been flushed without talking to someone first. Years of hardened sediment can clog the drain valve or start a leak at it, and on a tank near the end of its life that is the push that finishes it.