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How a Tankless Water Heater Works

Tankless water heaters work very differently from tanked water heaters and therefore have different parts. Instead of holding hot water in a large tank, the water heater only kicks on when there is a demand for hot water, like when a shower or tap is turned on. So, instead of heating the water all day and night, the tankless water heater is off until it is needed.
Inside the tankless system, a burner ignites when the system signals a need for hot water. The cold water passes over an aluminum heat exchanger and heats the water directly. When the hot water is shut off, the system goes into standby mode. A tankless water heater also has a vent that exhausts any gases outside the home.
Here are some gifs to illustrate how a tanked water heater and a tankless water heater work.
To help you understand better how a tankless water heater works, here is a list of steps:

STEP 1 - You Call For Hot Water: You want to make sure that hot water is flowing through your pipes, this means turning on the hot water. Of course, today that isn’t always a simple explanation. If you have a single knob, be sure to turn it towards the hot water. If you have dual knobs, it’s much simpler. Locate the hot water knob, and turn it to allow the hot water to flow through.

STEP 2 - Water enters the heater So, now that you have the hot water turned on, what should you expect? With a regular water heater, you expect hot water to travel from the tank through your pipes. However, with a tankless water heater, cold water actually flows through sensors that trigger the internal computer, and begin the heating process.

STEP 3 - Water flow sensor detects the water flow Now that the internal computer has been triggered, it immediately calculates how hot the burners need to be, in order to heat the water to the perfect temperature. This can be done with a gas burner or an electrical element. Either way, it provides a constant flow of hot water, without having to wait for a tank to fill back up.

STEP 4 - Computer automatically ignites the burner So how does the tankless water heater actually provide all that hot water? After the burner begins heating the water, it circulates around a heat exchanger until it reaches its designated temperature. From there, the water exits the tankless water heater and begins traveling through your pipes until reaching its final destination.

STEP 5 - Water circulates through the heat exchanger With a tankless water heater, you enjoy an endless stream of hot water to use. Once the demand for hot water no longer exists, the tankless water heater automatically shuts down and stops using energy. So, you get to enjoy energy savings along with constant and fresh hot water.

When making a decision on whether or not to switch to a tankless water heater, it’s important to know how one works. Along with knowing how it works, you also want to know what the benefits of having a tankless water heater would be as well. Having a steady stream of hot water is just one benefit. However, a lot of people also enjoy the money savings with a tankless water heater because it uses less energy to operate than a tanked one.

   Click here to read about 7 Benefits of a Tankless Water Heater
   Click here to read the differences between a standard and tankless water heater
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Logo for Any Hour Electric, Plumbing, Heating & Air featuring a smiling technician with crossed arms, a stopwatch, and a bold, professional tone.

Any Hour Services

1374 West 130 South, Orem, UT 84058

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© 2024 Any Hour Services LLC

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Our pricing is fair and transparent. We use a fixed-price guide that reflects the time, materials, and real costs of running a dependable home services business. No hourly rates. No inflated prices based on where you live. We focus on what it takes to get the job done—not on how much we can charge.

Before we price your drains or excavation project, our expert technician will perform an in-home assessment to evaluate the tasks required. We only charge for what’s necessary—no fluff, no extra costs. This allows us to pinpoint areas where we can save you money without sacrificing quality.

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A: We price the job—not the clock. Hourly rates can be unpredictable, leaving you unsure of the final cost until the job is done. We believe in upfront, fixed pricing based on the work itself—not guesswork. You won’t pay for delays or mistakes, and we hold ourselves accountable to ensure there are no surprises.

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We prefer to price based on the job and not what other companies charge. Hourly rates can lead to unexpected costs for homeowners, making the final price unpredictable. By pricing the work itself, we make sure you’re only paying for what’s actually needed—keeping things fair and efficient.

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Requesting a quote is simple. Contact Any Hour Services, and we will assess your needs, providing a transparent estimate for the repairs.

We also provide FREE estimates and second opinions for major plumbing and excavation projects like repiping, sewer or water line replacements, remodels, and outdoor drain installs. Our team will evaluate the job in person, explain your options, and give you clear, upfront pricing. No hourly rates. No surprises. Just honest answers and expert service.

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Yes, you can request a quote online—our team at Any Hour Services responds promptly to every inquiry.

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We offer a $29 Drain Clear for single, easy-access drains. A licensed plumber will inspect the issue, clear out buildup like grease or debris, and get things flowing again. It’s a simple, affordable way to fix slow drains and help protect your plumbing from bigger problems down the line.

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Yes, we provide FREE estimates for sewer main line replacements. If you are looking to replace your sewer main line, one of our expert technicians will come to your home and inspect your sewer main line, before showing you your options. Call us if you have questions about replacing your sewer main line—we’re here to help!

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You can pay for your service with cash, check, or any major credit card. We collect, in full, upon completion of the project. If you would like to make monthly payments, we have many financing options available through 3rd party finance companies (On Approved Credit). Your technician can talk to you about your options when they give you pricing options for the work you want done.

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Our phone staff are not expert technicians, so they can’t quote prices that would be accurate to your project’s needs. A trained technician needs to see the job firsthand to give you a clear, upfront price. Quotes over the phone are a guess, and we prefer transparency over uncertainty.

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Ballpark prices can be misleading. Until we see the job, we can’t quote your final estimate accurately. Other companies may give an estimate range, but that often leads to additional costs and surprises later. Instead, we focus on giving you a fair price once a trained technician can assess the job properly.

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A: We have a small dispatch fee to send our technician to your home. They’ll arrive in a truck stocked with thousands of parts, ready to complete most jobs the same day. After a thorough evaluation, your technician will explain the issue, walk you through the recommended fix, and show you your options and final price. No hourly rates. No surprises. Just a clear, upfront price before any work begins.

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Pricing FAQ

A:

Our pricing is fair and transparent. We use a fixed-price guide that reflects the time, materials, and real costs of running a dependable home services business. No hourly rates. No inflated prices based on where you live. We focus on what it takes to get the job done—not on how much we can charge.

Before we price your plumbing job, our licensed plumber will perform an in-home assessment to evaluate the tasks required. We only charge for what’s necessary—no fluff, no extra costs. This allows us to pinpoint areas where we can save you money without sacrificing quality.

Call Now

A:

We price the job—not the clock. Hourly rates can be unpredictable, leaving you unsure of the final cost until the job is done. We believe in upfront, fixed pricing based on the work itself—not guesswork. You won’t pay for delays or mistakes, and we hold ourselves accountable to ensure there are no surprises.

Call Now

A:

We prefer to price based on the job and not what other companies charge. Hourly rates can lead to unexpected costs for homeowners, making the final price unpredictable. By pricing the work itself, we make sure you’re only paying for what’s actually needed—keeping things fair and efficient.

Call Now

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Water heater replacements vary. Often, older units require updates to meet safety standards. Common items missing from many water heaters are flexible gas lines, expansion tanks, earthquake straps, gas sediment trap, upgrade exhaust venting, etc.

For an accurate quote, one of our licensed plumbers will inspect your existing system and provide a FREE estimate.

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Our phone staff are not licensed plumbers, so they can’t quote prices that would be accurate to your project’s needs. A trained plumber needs to see the job firsthand to give you a clear, upfront price. Quotes over the phone are a guess, and we prefer transparency over uncertainty.

Call Now

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Ballpark prices can be misleading. Until we see the job, we can’t quote your final estimate accurately. Other companies may give an estimate range, but that often leads to additional costs and surprises later. Instead, we focus on giving you a fair price once a licensed plumber can assess the job properly.

Call Now

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We have a small dispatch fee to send our plumber to your home. They’ll arrive in a truck stocked with thousands of parts, ready to complete most jobs the same day. After a thorough evaluation, your plumber will explain the issue, walk you through the recommended fix, and show you your options and final price. No hourly rates. No surprises. Just a clear, upfront price before any work begins.

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Yes! We offer FREE in-home estimates for major projects like water heater installations, water softeners, and repiping—without any dispatch fee. Our licensed plumber will assess the job, explain your options, and provide a clear, fixed price. No surprises or hourly rates—just honest, reliable service. Schedule your FREE estimate today!

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No, our plumbers don’t quote a price until they have seen your plumbing project. Once they quote a price, it doesn’t change, no matter how long it takes. At any time, if you want to add more tasks to your plumbing project, your plumber will let you know how much it would cost to perform the extra work.

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You can pay for your plumbing service with cash, check, or any major credit card. We collect, in full, upon completion of the project. If you would like to make monthly payments, we do have many financing options available through 3rd party finance companies, OAC. Your plumber can talk to you about your options when they give you pricing options for the work you want completed.

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