FAQs About Tankless Water Heaters: Answers to Common Questions

Tankless water heaters, also known as on-demand water heaters, are becoming increasingly popular for their efficiency and convenience.

If you’re considering installing one, you may have questions about how they work, their advantages, and the installation process. Here, we answer some of the most frequently asked questions about tankless water heaters.

How Does a Tankless Water Heater Work?

A tankless water heater works on demand, meaning it doesn’t use gas or electricity until hot water is needed. When you turn on a faucet or shower, the unit activates and heats water as it flows through the system. Unlike traditional water heaters, it doesn’t store hot water in a tank.

Premium tankless water heaters, also called hybrid water heaters, include a buffer tank with a pump. This eliminates the "cold water sandwich" effect—a brief burst of cold water before hot water reaches the faucet—and allows hot water to flow more quickly to the point of use.

What Are the Advantages of Using a Tankless Water Heater?

Tankless water heaters offer several benefits:

Endless hot water: You can enjoy consistent hot water for as long as you need, whether it’s a quick shower or hours of use.
Energy efficiency: They are more efficient than traditional water heaters, reducing your gas or electricity bills.
Longevity: All parts are replaceable, which means a much longer lifespan compared to tank-type water heaters.
Space-saving design: Without a bulky tank, tankless water heaters save floor space and won’t flood your home if they fail.
Better warranties: They often come with longer warranties compared to traditional models.

Can a Tankless Water Heater Be Installed in the Same Place as the Old Water Heater?

Yes, tankless water heaters are highly versatile and can be installed almost anywhere, including the same location as your old water heater. The installation process allows flexibility, and adjustments can be made to fit the space available in your home.

How Much Does It Cost to Have a Tankless Water Heater Installed?

The cost of installing a tankless water heater varies depending on several factors, including the model, home layout, and installation requirements. At ABC Plumbing, we send a licensed technician to your home to evaluate your needs and discuss your options. You’ll receive a guaranteed price in writing before any work begins, ensuring there are no surprises.

Why Choose ABC Plumbing for Your Tankless Water Heater Needs?

At ABC Plumbing, Sewer, Heating, Cooling, and Electric, we specialize in tankless water heater installations and maintenance. Our licensed technicians ensure proper installation and provide expert advice on the best unit for your home. We’re here to help you enjoy the benefits of endless hot water, energy efficiency, and peace of mind.

Scroll further down this page, locate the location closest to you, and click the phone number to call us. Let us answer your questions and help you make the best choice for your home’s hot water needs.

ABC Plumbing Locations

Arlington Heights, IL

220 W Campus Dr
Arlington Heights, IL 60004
Phone: (888) 991-3942

Largo, FL

11701 S Belcher Rd Suite 127
Largo, FL 33773
Phone: (888) 465-9799

Downers Grove, IL

1001 Ogden Ave LL4
Downers Grove, IL 60515
Phone: (888) 412-3566

Tampa, FL

4326 W El Prado Blvd Suite 7
Tampa, FL 33629
Phone: (888) 594-9030

Evanston, IL

828 Davis St UNIT 205
Evanston, IL 60201
Phone: (888) 868-9369

Related Services

Our Blog

VIEW ALL BLOGS

Leaks Under Your Sink? DIY Plumbing Checks Before Calling the Professionals

Regular plumbing checks are a simple yet effective way for homeowners to prevent costly repairs and protect their home. By routinely inspecting areas like under sinks and outdoor hose connections, you can catch small leaks early and address minor issues before they escalate. Simple actions like tightening fittings, replacing worn washers, and monitoring for moisture can go a long way in maintaining your plumbing system. While DIY checks are helpful, it’s important to know when to call a professional for persistent or more serious problems. Staying proactive with plumbing maintenance helps ensure efficiency, lower water bills, and long-term peace of mind.

Chicagoland HVAC Repair, Installation & Maintenance: Your Year-Round Comfort Guide

Chicagoland’s extreme weather—from freezing Illinois winters to hot, humid summers—puts constant strain on your HVAC system. This guide covers the most common heating and cooling issues homeowners face, including furnace problems in winter and AC performance challenges in summer. You’ll learn essential maintenance tips, warning signs to watch for, and when it’s time to repair or replace your system. Stay comfortable year-round with expert insights on HVAC repair, installation, and maintenance tailored for Midwest homes.
READ MORE
DIY Water Heater Flush: What You Can Do Before Calling a Plumber

Your water heater plays a vital role in your daily comfort—but without proper maintenance, it can lose efficiency or develop costly issues. In this guide, we explain why draining your water heater is important, the warning signs to watch for, and how homeowners can safely perform a basic flush. You’ll also learn common mistakes to avoid and when it’s time to call a professional plumber to ensure your system is running safely and efficiently.
READ MORE
What You Can (and Shouldn’t) Do With Your Electrical Panel

Your home’s electrical panel powers everything from your lights to your essential appliances—but handling it improperly can be dangerous. In this guide, we walk homeowners through how to safely locate and perform basic checks on their electrical panel using simple sight, sound, and smell inspections. You’ll also learn the key warning signs of electrical issues, what tasks you should never attempt on your own, and when it’s time to call a licensed electrician. Stay informed, stay safe, and protect your home with these essential electrical panel tips.
READ MORE