A new tank, sized for the morning rush.Storage water heater installation and replacement in Cleveland.

How a storage tank works

Forty or fifty gallons, kept hot all day.

A tank (storage) water heater keeps a volume of water hot so it is ready when a tap opens. Gas models have a burner underneath and a flue up the middle; electric models have upper and lower heating elements. A glass lining and a sacrificial anode rod protect the steel tank. When the anode is gone, the steel starts to rust. When the steel rusts through, the tank leaks and replacement is the only fix.

Federal guidance puts typical tank life at about 10 to 15 years.^[1] In Cleveland, two local facts shorten the "wait and see" window: the water is not soft, and the housing is old.

Cleveland Water reports hardness of 105–130 mg/L as calcium carbonate, averaging 117 mg/L.^[2] Minerals settle on the tank floor, cause popping noises, waste energy, and stress the bottom of the tank. A tank that has never been flushed in a 1950s Parma ranch or a pre-war Cleveland duplex often shows its age as noise and rusty hot water before it shows a puddle.

Why like-for-like is so common

If the home already has a vented gas tank, swapping in another gas tank is usually the least disruptive path: the gas pipe, vent, and water lines are already there. If it is electric with a correctly sized circuit, an electric tank (or a heat pump unit, if the space allows) may slot in without new combustion venting. Switching fuels is a different job — see tank vs tankless and the conversion page.

Sizing by first-hour rating

The U.S. Department of Energy recommends sizing storage water heaters by first-hour rating (FHR), the amount of hot water the heater can supply in an hour starting full.^[4] Two 50-gallon tanks can have different FHRs depending on how fast they recover. A family that showers back-to-back on a weekday morning cares about that recovery, not the number painted on the side.

An installer estimates peak hour demand from bathrooms, laundry, and kitchen use, then picks a unit whose FHR covers it with a bit of room. Guessing from square footage alone is how households end up with lukewarm second showers.

Gas tanks in Cleveland basements

Chimneys, shared vents, and leftover flues.

About 77.9% of occupied Cleveland homes are heated with utility gas.^[5] In a house that old — about 48.6% of housing units here were built in 1939 or earlier^[5] — the water heater often shares a story with the furnace. An atmospheric gas tank may still vent into a masonry chimney that once also served a furnace. If that furnace was later replaced with a high-efficiency unit that vents through a sidewall in plastic pipe, the water heater may be the only appliance left on a chimney that is now too large, too cold, or in need of a liner.

That is not a reason to panic, and it is not a reason to assume every old house needs a power-vent or tankless unit. It is a reason for the installer to look at the vent, not just the tank. Soot, backdrafting, a disconnected draft hood, or a crumbling chimney liner are safety issues, not cosmetic ones.

Electric tanks

Electric storage heaters need a dedicated circuit sized for the elements. They skip combustion air and venting, which can make them a fit when a chimney is a problem and gas work would snowball. Recovery is typically slower than a same-size gas tank; compare first-hour ratings rather than assuming "electric is weaker."^[4]

What the install usually includes

• Shutting down water and fuel or power, draining and removing the old tank
• Setting the new unit, connecting supply lines, and updating tired valves or connectors
• Checking or updating T&P discharge piping so it is not capped and terminates safely
• Adding an expansion tank or drain pan when the house and local rules call for them
• Filling, purging air, firing or energizing, and checking for leaks
• Hauling away the old tank and leaving the permit path clear for inspection

Cleveland-specific wrinkles

• Hardness and sediment. Average reported hardness of 117 mg/L as CaCO3 means flushing and anode checks are not optional trivia.^[2]
• Basement stairs. In pre-war doubles and lake-effect bungalows the tank often sits at the bottom of a narrow stair. Access affects labor more than the unit price does.
• Closed municipal systems. Expansion tanks show up more often on modern closed water systems than they did when some of these houses were built.
• Separate suburb rules. A Lakewood or Parma job uses that city's building department, not Cleveland's plumbing-permit desk. See the area guides.

Related: repair vs replace · warning signs · cost factors

FAQ

Tank installation questions.