Tankless water heaters are quickly becoming the go-to choice for Chandler, AZ and surrounding areas homeowners looking to save space, reduce energy bills, and enjoy endless hot water on demand. But how does a tankless water heater work, and is it the right fit for your home?
At Knockout Plumbing, LLC, we specialize in tankless water heater installation, tankless water heater repair, and full-service plumbing upgrades across Arizona. In this article, we’ll break down the basics of how these systems operate, answer common questions like how much is a tankless water heater, and share expert tips on tankless water heater maintenance—so you can make the best decision for your home and budget.
Whether you’re planning a bathroom remodel, upgrading your gas line installation, or simply tired of running out of hot water, this guide will help you understand if a tankless water heater is the knockout solution your home needs.
What Is a Tankless Water Heater?
A tankless water heater, also known as an on-demand water heater, provides hot water only when you need it—without the need for a bulky storage tank. Unlike traditional water heaters that keep a large tank of water heated around the clock, tankless units heat water instantly as it flows through the system.
There are two main types of tankless units:
Gas-powered tankless water heaters
These use a gas burner to quickly heat water as it passes through a heat exchanger. They are ideal for homes with an existing gas line installation.
Electric tankless water heaters
These use electric coils to heat the water and are great for smaller homes or areas where gas service is unavailable. These may require electrical panel upgrades, depending on your system.
Tankless water heaters are compact, energy-efficient, and perfect for Arizona homeowners looking to reduce utility costs and free up space in utility rooms, garages, or during a full bathroom remodel.
How Does a Tankless Water Heater Work?
So, how does a tankless water heater work? Unlike traditional systems that store and continuously heat a tank of water, a tankless water heater activates only when you turn on a hot water tap.
Here’s how it works step by step:
1. Water flow triggers the system
When you turn on a hot water faucet or appliance, cold water enters the tankless unit.
2. Sensor detects demand
A built-in flow sensor detects water movement and signals the unit to begin heating.
3. Heating begins instantly
Either an electric element or gas burner (depending on your unit type) heats the water as it flows through a high-efficiency heat exchanger.
4. Hot water delivered on-demand
The heated water travels directly to your faucet, shower, or appliance—no waiting for a tank to refill.
Because tankless systems don’t suffer from standby heat loss, they’re more efficient, especially when paired with services like water softeners, water filtration, or electrical panel upgrades to support demand.
Knockout Plumbing ensures proper sizing, gas or electrical services, and any necessary repiping or leak detection to support safe, long-lasting performance.
How Much is a Tankless Water Heater
If you’re considering making the switch, you’re likely wondering: how much is a tankless water heater? While prices can vary depending on your home’s needs and the type of unit you choose, tankless systems are generally a bigger upfront investment compared to traditional water heaters—but they also offer longer-term savings and efficiency benefits.
What Affects the Total Cost?
Type of Unit
Gas-powered tankless systems tend to cost more upfront but may offer greater heating capacity for larger households. Electric units are more compact and affordable to install but may require electrical services or panel upgrades.
Installation Requirements
Homes converting from a standard water heater may need updates like repiping, gas line installation, or trenchless sewer repair if aging infrastructure is uncovered.
Home Size and Water Usage
Larger homes or those with multiple bathrooms will need higher-capacity units, which can affect both cost and installation time.
Upgrades and Safety
If your current plumbing system has hidden issues like slab leaks or poor pressure, those will need to be addressed first to ensure a safe and efficient installation.
WWe assess your home’s specific setup and provide customized recommendations. We also offer service agreements and flexible options so your investment in energy-efficient comfort is backed by expert support.
Tankless Water Heater Maintenance
Like any major appliance, tankless water heaters require regular care to keep them running efficiently and to extend their lifespan. While they generally need less attention than traditional tank systems, proper tankless water heater maintenance ensures consistent performance and reduces the risk of unexpected breakdowns.
Here are some routine maintenance tips:
Descale the every year
Mineral buildup (especially in Arizona’s hard water) can reduce efficiency. Annual descaling helps prevent internal corrosion and maintains flow rate, especially important if you don’t yet have a water softener or water filtration system in place.
Flush the system
Flushing out the unit removes sediment and helps protect the heat exchanger. This is typically done during your annual service.
Clean the inlet filter
A clogged inlet filter can restrict water flow. Regular cleaning prevents pressure issues and keeps the system operating smoothly.
Check for error codes
Most tankless models have digital displays or warning indicators. If an error appears, it could signal a need for leak detection, pressure relief, or gas line repair.
Schedule a professional inspection
Knockout Plumbing offers tankless water heater repair and annual maintenance services to ensure everything is functioning as it should. In addition, we can bundle this with other services like drain cleaning, sewer inspection, or electrical panel checks.
Pros and Cons of Tankless Water Heaters
Before committing to a new water heating system, it’s important to understand the advantages and potential trade-offs of going tankless. We help homeowners weigh these factors to decide what fits their home, usage, and long-term goals.
Tankless water heaters offer several key advantages that make them an attractive choice for modern homes. First, they provide endless hot water by heating water on demand, which is ideal for larger households or homes with high water usage, like back-to-back showers.
Their energy-efficient design eliminates standby heat loss, helping reduce overall energy consumption and lower monthly utility bills. With a space-saving, wall-mounted design, tankless units are perfect for compact areas or can be easily integrated into a bathroom remodel.
They also boast a longer lifespan than traditional tank models, especially when maintained properly. Finally, their eco-friendly operation, thanks to greater efficiency and reduced fuel usage, makes them a smart investment for homeowners looking to reduce their environmental footprint.
However, while tankless water heaters offer many benefits, there are a few considerations to keep in mind. They come with a higher upfront cost, as installation may involve repiping, electrical upgrades, or gas line installation, especially if you’re switching from a traditional tank system.
Some units may also have a limited flow rate, making it challenging to supply hot water to multiple fixtures at once unless properly sized for your household. Additionally, annual maintenance (such as descaling and flushing) is essential, particularly in Arizona’s hard water conditions.
That said, the pros far outweigh the cons for most Arizona homeowners. With expert guidance from Knockout Plumbing, we’ll help you navigate every step—from sizing and installation to long-term service agreements—ensuring a smooth, efficient transition to tankless.
Is a Tankless Water Heater Right for You?
A tankless water heater can be a smart upgrade but it’s not a one-size-fits-all solution. Tankless system may be right for you if:
- You want endless hot water for back-to-back showers or large households
- You’re remodeling or upgrading plumbing and want to save space
- You’re looking to lower your monthly energy bills
- Your current water heater is aging, inefficient, or frequently needs repair
- You want a solution that pairs well with water softeners, filtration systems, or electrical panel upgrades
- You’re already making home improvements like gas line repair, repiping, or sewer replacement and want to future-proof your system
Before you switch, consider these first:
- Your home may need infrastructure upgrades (like electrical work or gas line installation)
- Large homes with multiple simultaneous users will need a higher-capacity unit
- Hard water areas require consistent tankless water heater maintenance
Why Choose Knockout Plumbing for Your Tankless Water Heater Needs
When it comes to tankless water heater installation, choosing the right plumbing partner makes all the difference. At Knockout Plumbing, we bring years of experience, licensed technicians, and a commitment to customer satisfaction to every job. If you’re upgrading your current system, starting a bathroom remodel, or simply want a more energy-efficient solution, we make the process smooth, transparent, and hassle-free.
Our team can handle everything your home might need, from gas line installation and electrical panel upgrades to repiping, leak detection, and water filtration solutions. In addition, with 24/7 emergency service and tailored service agreements, you can count on us to support you well after installation is complete.
Homeowners across Arizona trust Knockout Plumbing for quality craftsmanship, honest pricing, and reliable service. When you’re ready to upgrade to tankless, we’re ready to help you do it right.
Ready to enjoy hot water on demand with no compromises?
Contact Knockout Plumbing today to schedule a consultation or get a quote.