Waterless Tank Water Heater: Everything You Need to Know in 2025

A waterless tank water heater may sound like a contradiction—but it's actually a powerful and highly efficient home upgrade. Designed to heat water on demand without relying on a bulky storage tank, these systems are perfect for homeowners looking to reduce energy costs and save space. In this post, we’ll explore how these systems work, their key advantages, and why they’re becoming increasingly popular in North Little Rock, AR and nearby communities.

What Is a Waterless Tank Water Heater?

A waterless tank water heater is another term for a tankless or on-demand water heater. Rather than heating and storing hot water in a tank, it heats water only when you turn on the tap.

These systems are compact, energy-efficient, and can be installed on walls—freeing up valuable floor space in your utility room or garage.

How Does It Work?

Real-Time Heating

When you open a hot water tap, cold water enters the unit and flows over a heat exchanger, which is powered by either gas or electricity. The system then heats the water instantly and delivers it directly to your faucet, shower, or appliance.

No Tank, No Waste

There’s no need to keep a tank of water hot 24/7. This not only reduces your energy usage but also eliminates the risk of running out of hot water.

Key Features of Waterless Tank Water Heaters

Continuous Hot Water

Never run out of hot water again—even during peak usage times.

High Efficiency

Models are often Energy Star® certified, consuming less energy and lowering monthly utility bills.

Compact Size

These systems are often no larger than a suitcase and can be mounted on interior or exterior walls.

Longevity

Most systems last 15–20 years, much longer than traditional tank systems, which usually last 8–12 years.

Are “Waterless” and “Tankless” the Same?

Yes, in most cases, “waterless tank water heater” is a marketing synonym for tankless water heater. There is no separate category for “waterless”—but the term emphasizes that the unit does not store or hold water inside a tank.

If you’re shopping for a “waterless” system, you can safely evaluate tankless water heaters from trusted brands like Rinnai, Navien, and Noritz.

Pros and Cons of Waterless Tank Water Heaters

Pros:

• Unlimited hot water supply

• Lower energy bills

• Space-saving design

• Reduced risk of leaks or tank corrosion

• Long system lifespan

Cons:

• Higher upfront and installation cost

• May require upgraded gas lines or electrical panels

• Slower to deliver hot water to distant fixtures (remedied with recirculation pumps)

Cost of a Waterless Tank Water Heater

Equipment Cost

• Electric models: $500–$1,200

• Gas models: $900–$2,000+

Installation Cost in North Little Rock

Professional installation can range from $1,000–$2,500, depending on:

• Location of installation

• Type of model (gas or electric)

• Plumbing and venting modifications

Arrow Plumbing offers free estimates for all installations in the Central Arkansas area.

Maintenance Tips to Extend System Life

• Flush the unit annually to remove scale buildup

• Clean inlet filters every 6–12 months

• Inspect for leaks or flow irregularities

• Use a water softener if you have hard water

Regular maintenance helps your system run smoothly and maximizes energy efficiency.

Is a Waterless Tank Water Heater Right for You?

You may benefit from upgrading if:

• Your current water heater is older than 10 years

• You want to reduce monthly energy bills

• You have a small home or limited utility space

• You’re building or remodeling and want a modern solution

Get Expert Help from Arrow Plumbing

Thinking of switching to a waterless tank water heater? Trust the local experts at Arrow Plumbing for professional recommendations, installation, and service.

Contact Us:

• Phone: (501) 443-3515

• Address: 4007 MacArthur Dr., North Little Rock, AR 72118

• Schedule Service: arrowplumbing.net/contact-us

We proudly serve homeowners throughout Little Rock, North Little Rock, Sherwood, Maumelle, Conway, and the surrounding areas.

Final Thoughts

A waterless tank water heater is more than just a trend—it’s a smart investment in comfort, savings, and efficiency. Whether you're replacing an outdated tank or building a new home, now is the time to go tankless and experience modern plumbing convenience.

• Plumbing