Water Heaters

How a Tank Water Heater Works

A storage water heater is a steel tank lined with glass, wrapped in insulation and covered by a metal jacket. Cold water enters through a dip tube that carries it to the bottom of the tank. A gas burner under the tank, or one or two electric elements inside it, heats the water. Hot water rises and leaves from the top outlet when you open a tap.

A thermostat controls the burner or elements. A temperature and pressure relief valve, usually called the T&P valve, opens if the water gets too hot or the pressure climbs too high. Inside the tank sits an anode rod, a sacrificial metal rod that corrodes so the tank steel doesn’t. Gas units also have a flue running up through the center of the tank to carry exhaust out of the house.

Most of what goes wrong with a tank comes back to one of those parts. Knowing which one is failing tells you whether you’re looking at a modest repair or a replacement.

Signs Your Water Heater Needs Attention

Water heaters usually give warnings before they quit. Here’s what homeowners tend to notice first and what it usually points to.

Not enough hot water

If showers go lukewarm sooner than they used to, the usual causes are a failed lower element on an electric unit, a bad thermostat, a broken dip tube letting cold water mix at the top, or a tank that’s half full of sediment. Sometimes it’s simply a tank that was undersized for the household from day one.

No hot water at all

On an electric heater, check the breaker first, then the reset button on the upper thermostat. If it trips again, there’s usually a shorted element or thermostat behind it. On a gas unit, a pilot that won’t stay lit often means a worn thermocouple or a failing gas control valve.

Popping or rumbling

That noise is water trapped under a layer of sediment boiling as the burner or element fires. It wastes energy and overheats the bottom of the tank.

Rusty or smelly water

Brown hot water, with clear cold water, often means the anode is used up and the tank itself is starting to rust. A rotten egg smell that shows up only on the hot side is common in homes on well water. Sulfate-reducing bacteria react with a magnesium anode and produce hydrogen sulfide gas. Swapping the anode for a different material and disinfecting the tank usually takes care of it.

Water around the base

Look for the source before you panic. A drip from the T&P valve, a loose fitting on top or a leaking drain valve can be fixed. Water coming from the tank body itself can’t. If the leak isn’t obvious, our leak detection work can confirm whether the heater is the culprit or a supply line nearby.

Repair or Replace

We start with the age of the unit and the condition of the tank. A heater that’s a few years old with a bad part is worth fixing. A tank that’s 10 or 12 years old and leaking from the bottom is done, and pouring money into parts on it rarely pays off.

Common repairs we handle

• Electric heating elements, upper or lower, which burn out from scale or dry firing
• Thermostats and high-limit switches that stop calling for heat or trip repeatedly
• Thermocouples, flame sensors and gas control valves on gas units
• T&P valves that drip, stick or have been leaking into the pan
• Anode rods that are worn down to bare wire
• Dip tubes that have cracked or broken apart
• Drain valves, supply connectors and shutoff valves

Replacement makes more sense when the tank itself leaks, when rust shows up in the hot water on an older unit, or when you’re facing a second or third repair in a short stretch. It also makes sense if the heater never kept up with your household and you’d rather fix that problem once. We’ll tell you plainly which way we’d go and why. For other fixtures and fittings around the house, see our general plumbing repairs page.

How Long Tank Water Heaters Last in Southwest Florida

Manufacturers generally put the life of a tank water heater at around 8 to 12 years. Tankless units tend to run longer, often 15 to 20 years. Where your heater lands in that range depends on water quality, maintenance and how hard the unit works.

Water varies a lot around here. Some city systems deliver fairly soft treated water, while homes on private wells can see much harder water, plus iron or sulfur. Minerals settle out when water is heated, so hard water builds sediment faster. That layer insulates the bottom of the tank from the burner, coats electric elements with scale, and speeds up wear.

The anode rod matters just as much. Once it’s gone, the water goes to work on the tank steel. Many tanks fail simply because nobody ever checked the rod. Heaters in hot garages and ones that sit full and unused for months in seasonal homes can also age in ways owners don’t notice until there’s a leak.

Sizing a New Water Heater

Tank size in gallons is only half the story. The number that matters more is the first-hour rating, printed on the yellow EnergyGuide label. It tells you how many gallons of hot water the heater can deliver in one busy hour starting with a full tank.

To size a heater, think about your peak hour. A morning with two back-to-back showers, a load of laundry and the dishwasher running adds up fast. A typical shower uses around 20 gallons of hot water and a clothes washer can use 15 to 25. Add up what happens in your busiest hour and pick a unit whose first-hour rating meets or beats it.

We also look at what’s changing in the house. Adding a bathroom, a large soaking tub or a multi-head shower during a remodel can push demand past what the old heater could handle. It’s easier to size up during replacement than to live with cold showers after.

Gas, Electric or Heat Pump

Electric tanks are the simplest setup. Gas makes sense where natural gas or propane is already at the house. Each has trade-offs.

Electric tank

Simple, no venting, and the easiest to install in a closet or garage. The trade-off is slower recovery than gas and higher operating cost than a heat pump model.

Gas tank

Gas heaters recover quickly, which helps larger households. They need proper venting, combustion air and a gas supply sized for the burner. Venting has to be checked and often updated on replacement.

Heat pump (hybrid electric)

A heat pump water heater pulls heat from the surrounding air and moves it into the tank, using backup elements only when demand is high. They use far less electricity than a standard electric tank. They need room around them for airflow, a drain for condensate, and a space that stays within the manufacturer’s operating range. In humid months, they also cool and dehumidify the space they sit in, which many Florida garages could use.

Federal efficiency changes coming

The U.S. Department of Energy finalized new efficiency standards for residential water heaters that apply to units made on or after May 6, 2029. Most common electric tanks over 35 gallons will need to reach heat pump levels of efficiency. Gas tank heaters face a smaller increase. If you’re replacing a heater in the next few years, it’s worth thinking about whether your space can fit a heat pump model. Where a tank doesn’t fit your space or usage, our tankless water heater page covers that option.

What a Water Heater Replacement Involves

Swapping a tank isn’t just disconnecting one and connecting another. Building departments in this area, including Lee County and Bonita Springs, require a permit for water heater replacement, and the new installation has to meet current code rather than whatever was acceptable when the old one went in. Requirements vary by jurisdiction, so we check what applies to your address.

The typical steps

• Pull the permit where one is required
• Shut off water and power or gas, drain the old tank and haul it away
• Set the new heater, in a pan where the location calls for one
• Connect water lines, shutoffs and gas or electrical connections
• Install or correct the T&P discharge line
• Add a thermal expansion tank if the water system is closed
• Check venting and combustion air on gas units
• Fill, test, set the temperature and schedule the inspection

Code items that often need updating

Drain pans. Florida’s plumbing code calls for a pan under a tank heater installed where a leak would cause damage, such as a closet, attic or utility room. On a replacement where there was no pan before, the code may allow the pan without a drain line, but the pan still has to be there.

T&P discharge. The relief line has to be at least the size of the valve outlet, drain by gravity, have no valves or threads at the end, and terminate where it’s visible, no more than 6 inches above the floor or receptor. We see plenty of older installs where the line was undersized, capped or run uphill. Those get fixed.

Expansion tanks. When the water supply passes through a check valve, pressure reducing valve or backflow preventer, heated water has nowhere to expand. Code requires a thermal expansion tank on the cold supply in that case. Without one, pressure spikes can make the T&P valve weep and strain fixtures and fittings.

If your supply lines are old galvanized or the connections at the heater keep corroding, that’s often a sign the rest of the piping is aging too. We can look at whole-house repiping while we’re there.

Garages, Closets, Attics and Elevated Homes

Where the heater sits changes what the installation needs.

Plenty of Southwest Florida homes keep the water heater in the garage. Code requires appliances with an ignition source to be raised at least 18 inches above a garage floor, which affects some gas heaters depending on the unit’s design and local rules. Electric heaters in garages don’t have that requirement, but we still want them protected from vehicles.

Interior closets and utility rooms need a pan and a proper drain path, since a leak there goes straight into finished floors and walls. Attic installs are the riskiest. A pan is a must, and a leak sensor with automatic shutoff is a smart addition.

On elevated homes and in flood zones, the goal is to keep the heater out of floodwater. Federal building guidance recommends elevating water heaters at least a foot above base flood elevation, on a platform, on an upper floor or by switching to a wall-mounted unit. Local floodplain rules may set their own requirement, especially after substantial damage or a remodel.

Water Heaters After Storms and Flooding

If a hurricane or storm surge put water around your heater, don’t just turn it back on. Floodwater carries silt and salt that get into controls and wiring. The U.S. Consumer Product Safety Commission warns that gas control valves that have been under water need to be replaced, even if they seem to work, because internal corrosion can cause them to fail and leak gas.

Electric heaters have their own risk. Submerged elements, thermostats and wiring can short or corrode. In most cases, a heater that sat in floodwater, especially salt water, is a replacement, not a repair.

After a storm, keep the power or gas off to the unit until it’s been checked. We’ll inspect it, tell you what can be saved and, if it needs replacing, consider whether it should go back higher. Photos of the damaged unit are helpful for insurance claims, so take some before anything gets hauled out.

Maintenance That Adds Years

A few simple habits keep a tank running longer and working better.

• Flush the tank, or at least drain a few gallons from the bottom valve, to clear sediment. Homes with harder water benefit from doing it more often.
• Have the anode rod checked every few years and replaced before it’s gone. It’s the cheapest way to protect the tank.
• Lift the T&P valve lever briefly now and then to make sure it isn’t stuck. If it keeps dripping after, it needs replacing.
• Keep the area around the heater clear, especially around a gas burner or a heat pump’s air intake.
• Look at the pan and the connections on top once in a while for rust or moisture.

Temperature matters too. The Department of Energy suggests 120 degrees for comfortable hot water in most homes. Many heaters ship set higher, which wastes energy and raises scald risk. If someone in the house has a specific need for hotter water, we can talk through the options.

Seasonal Homes and Vacation Settings

Plenty of homes in our area sit empty for months. A water heater that’s running full time in an empty house is burning money and sitting under pressure with no one there to see a leak.

Before you leave, turn gas units to vacation or pilot setting and turn off the breaker to electric units. Heat pump models often have a vacation mode. Shutting off the main water supply adds another layer of protection. When you come back, restore power or gas and run hot water at a few fixtures. If water sat in the tank for months, a flush helps clear stale water and loose sediment. If the smell is off or the water is discolored, give us a call before assuming the heater is failing.

Commercial Water Heaters

Restaurants, offices, salons, retail spaces and multifamily buildings put very different demands on hot water. We repair and replace commercial tank heaters and work through sizing, venting, recirculation and code requirements for the building’s use. For the rest of the systems in your building, see our commercial plumbing services, and for heaters in a new build, our new construction plumbing page.

When to Call Us

Call if the tank is leaking, the T&P valve is discharging, you smell gas near a gas heater, or you’ve lost hot water and the breaker or pilot isn’t the fix. Those shouldn’t wait. For slow-building problems like short hot water, noise or discolored water, it’s still better to have it looked at before it turns into a flooded garage.

If you smell gas, leave the house and call your gas provider first. Once it’s safe, we can handle the heater.

We serve Fort Myers, Cape Coral, Naples, Bonita Springs, Lehigh Acres, Punta Gorda and Fort Myers Beach. Check our service areas, call (239) 518-4198, or send a request through our contact page. You can also see the full list of our residential plumbing services.