Tankless vs. Tank Water Heater: Which Is Better for Your New Jersey Home?

Quick answer: A tank water heater keeps 40 to 80 gallons of water hot and ready, costs less up front and is simple to replace. A tankless water heater heats water only when you open a tap, saves space, avoids standby heat loss and doesn't run out from an empty tank, but its flow rate limits how many fixtures can run at once and it usually costs more to install. The best choice depends on your household's hot water use, your gas supply and venting, and your budget.

When a water heater fails, it usually fails at a bad time, so it's worth knowing your options before it happens. Here's how tank and tankless compare for homes across New Jersey, from family homes in Jackson, Marlboro and East Brunswick to townhomes in Mount Laurel.

How each type works

Tank (storage) water heater: A gas burner or electric elements heat water in an insulated tank and keep it hot. When you use hot water, cold water refills the tank and is heated again. Once the stored hot water is used up, you wait for the tank to recover.

Tankless (on-demand) water heater: When you open a hot tap, water flows through a powerful heat exchanger and is heated instantly. There's no tank sitting hot between uses.

Hot water supply

Tank: Delivers strong flow to several fixtures at once until the tank runs low. A 50-gallon tank suits many families, but back-to-back showers can drain it.

Tankless: Supplies hot water continuously, but only up to its maximum flow rate. In winter, when incoming water is colder, that flow rate drops. A properly sized unit (or two units for large homes) avoids lukewarm showers.

Efficiency

Tank heaters lose some heat continuously through the tank walls (standby loss). Tankless units avoid that, so they're generally more efficient, especially in homes that use hot water at scattered times. High-efficiency condensing models of both types are available.

Space

Tankless units mount on a wall and take up a fraction of the space of a tank, which is a real advantage in small utility closets, condos and basements that flood. Tanks need floor space and clearance.

Installation and cost

Tank replacements are usually straightforward when replacing like for like. Tankless installations often need:

• A larger gas line (tankless burners use a lot of gas at full fire)
• New venting, often PVC for condensing models
• Electrical power for controls
• Sometimes a condensate drain

That makes tankless installation more involved, which affects the upfront price. We give you a written, upfront quote for both options so you can compare.

Lifespan

Tank water heaters commonly last around 8 to 12 years; sediment and corrosion eventually wear out the tank. Tankless units often last longer, commonly 15 years or more, if they're descaled regularly. Read more in water heater lifespan: when to replace.

Hard water and well water

Many inland New Jersey homes, especially those on wells, have hard water. Minerals settle in tanks as sediment and build up as scale in tankless heat exchangers.

• Tank: flush annually to remove sediment, and check the anode rod
• Tankless: descale about once a year, more often with hard water, and clean the inlet screen
• Either: a water softener can reduce maintenance

See our guide to flushing a water heater.

Which should you choose?

Choose a tank if:

• You want the lowest upfront cost
• Your household often runs several showers and appliances at once
• Your gas line and venting suit a tank, and you're replacing like for like

Choose tankless if:

• Space is tight or you want the tank off the floor
• You want continuous hot water for long showers or a big tub
• You plan to stay in the home long enough to benefit from the longer lifespan and efficiency

Consider a combi boiler if you have hot-water heat and your boiler is also aging. A combi boiler handles heat and hot water in one unit.

Gas, electric and heat pump water heaters

Both tank and tankless heaters come in gas and electric versions. Gas heaters recover quickly and are common where natural gas is available. Electric tank heaters are simple to install but recover more slowly. Electric tankless units need very large electrical service to heat water for a whole house, so they're usually best for point-of-use applications or small homes. Heat pump water heaters are a third option: an electric tank with a small heat pump on top that pulls heat from the surrounding air. They're very efficient, but they need space and room air to work with, and they cool and dehumidify the area around them, which can be a plus in a damp basement.

Safety and code items to know

Whatever type you choose, a proper installation includes a temperature and pressure relief valve piped to a safe location, correct venting for gas units, a gas shutoff and sediment trap, an expansion tank where required, and secure mounting with proper clearances. Setting the water temperature around 120°F is a common recommendation to balance comfort, efficiency and scald safety. We handle the details, including permits where required.

Signs your water heater needs attention

• Not enough hot water, or water that runs lukewarm (see water heater not heating)
• Rumbling or popping noises from sediment
• Rusty water or water around the base (see water heater leaking)
• A tank more than 10 years old

Get a water heater quote

We repair and install tank and tankless water heaters, gas and electric, across Ocean, Monmouth, Burlington and Middlesex counties. Book online for a free replacement estimate or learn more about our water heater services.