Best Tankless Water Heaters

Why Tankless Water Heaters Are the New Standard

If you’re thinking about upgrading your hot water system, the best tankless water heaters are quickly becoming the smart choice for many homeowners. Rather than storing a big tank full of hot water, tankless units heat water only when you need it. That means you won’t run out mid-shower, you won’t pay to keep unused water warm, and you’ll free up some space in your utility room. As technology has improved, tankless systems have become more affordable and reliable, making them a real favorite across homes in Cumming, Roswell, Lawrenceville, and the entire North Atlanta area.

This article provides an overview of all aspects of tankless water heaters. To do a deep dive into one aspect of this modern water heating technology, visit our ultimate tankless guide.

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How a Tankless Water Heater Works

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Tank vs Tankless Water Heaters

Traditional water heaters keep gallons of water hot and ready, even when you’re not using them. That storage means you’re paying to keep water warm all the time. With tankless, you only use energy when you open the hot water tap. Tank heaters still work, especially in simpler setups, but the best tankless water heaters often outperform them in energy use, comfort, and flexibility. If you’re ready to stop paying to keep unused water warm and want more consistent performance, tankless is often the better route.

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Tankless Electric Water Heater vs Tankless Gas Water Heater

Some smaller electric-powered models are handy for hot water right at one sink or small bathroom. But when you want the whole house covered, gas or propane units usually deliver better performance. Homes with multiple showers, appliances, or high hot water demand typically see the greatest benefit from gas tankless systems. If your home is already set up for gas or propane, one of the best tankless water heaters will often be gas-fueled for stronger output. In homes without gas, electric units can still work — but you may need to size them carefully to make sure they keep up.

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Tankless Water Heater Cost

Yes, the upfront cost for one of the best tankless water heaters is usually more than a standard tank heater at first glance. But prices have come down a lot, and the long-term savings often more than make up for the difference. You can save on energy bills because you’re not reheating unused water, and many local utilities or manufacturers offer rebates or incentives to help offset installation. Also, a modern, efficient hot water system can boost your home’s value. Over time, the investment often pays off.

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Tankless Water Heater Installation

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Tankless Water Heater Service

Once your tankless unit is in place, you still need to care for it — but maintenance is often simpler or more forewarned than with older systems. The best tankless water heaters today come with diagnostic features that let you see error codes or even error‐history, so you can fix small issues before they become big. Annual (or sometimes every couple of years, depending on water quality) flushing and descaling help keep efficiency high and avoid mineral buildup. With regular service, your system stays reliable and saves you hassle.

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Brands That Provide the Best Tankless Water Heaters

When it comes to choosing the best tankless water heaters, two brands stand out in the whole-home category: Rinnai and Navien. Both offer models designed to serve multiple fixtures, deliver high flow, and handle real home usage. They come with good support networks, warranties, and replacement part availability. If you choose one of these reputable brands, you’re more likely to find installers familiar with the product, get parts quickly, and avoid surprises down the road.

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Frequently Asked Questions (FAQs) About Tankless Water Heaters

How do I know what size tankless system I need?

To get one of the best tankless water heaters for your home, you’ll want to consider your household’s hot water usage: how many showers could run at once, how many appliances use hot water, and your incoming water temperature (it gets colder in some seasons). A plumber can help you calculate flow rate needs (gallons per minute, GPM) and guide you to the right model.

Are tankless water heaters noisy?

Tankless water heaters aren’t noisy. When installed properly, tankless water heaters don’t make much noise. Some electric units can make a soft hum, and gas models may have minimal sound while they’re working, but overall, the best tankless water heaters are designed to operate quietly. Good installation with appropriate venting and positioning keeps noise minimal.

Do I have to replace other plumbing components when I install a tankless water heater?

Sometimes. Depending on your home’s gas line, venting layout, or water quality, minor upgrades may be needed to support the best tankless water heaters. Your plumber will check everything (gas supply, venting, water pressure, pipe sizing) to make sure the system meets code and performs efficiently.

Is hard water a problem for tankless water heaters?

Hard water can contribute to mineral buildup, which is why regular flushing or descaling is important. That said, many of the best tankless water heaters are built to handle hard water better than older models, and preventative maintenance keeps them running at optimal efficiency. Your plumber may recommend a water softener or schedule more frequent maintenance if your water is hard.

Can I run out of hot water with a tankless?

If the system is sized poorly (too small), it may struggle to keep up with heavy simultaneous use. But when you choose one of the best tankless water heaters correctly sized for your home, the risk of running out is far lower than with traditional tanks.

Is a Tankless Water Heater Right for You?

If it’s time to replace your old water heater, this is your chance to determine whether a tankless system would best meet your hot water needs. For many homeowners, especially busy families or those who use a lot of hot water, the answer is yes. The best tankless water heaters make everyday life easier by giving you steady, reliable hot water whenever you need it — even if someone’s doing laundry while another person hops in the shower.

That said, tankless systems aren’t one-size-fits-all. They work best when installed by a professional who knows how to size and set them up for your home’s plumbing and energy source. Some older homes may need small updates to make the switch, but once installed, tankless systems are low-maintenance and built to last for decades.

They’re also great for homeowners who plan to stay in their home long-term, or who want to make an energy-efficient upgrade that can save money over time. Because they’re wall-mounted and compact, the best tankless water heaters also free up extra space — perfect for smaller homes, condos, or garages that need every square inch.

If you’re still deciding, we’re happy to help. Check out our water heater buying guide for an interactive quiz that can help you weigh your options and decide. The team at Aaron Plumbing, Heating & Cooling can explain the pros and cons, help you compare tank and tankless options, and make sure you choose a system that fits your home and your budget.

We offer tankless water heater installation in Alpharetta, Cumming, Johns Creek, Marietta, Roswell, Suwanee, and other North Atlanta areas. See a full list of our service areas on Aaron Services homepage.