Tankless Water Heater: What You Need to Know Before You Buy

Are you sick of running out of hot water? That’s not an issue with one of these small, ultra-efficient units that heat water as needed. Here’s everything you need to know about selecting, installing, and using a tankless water heater.

Consider this: the way most American households heat water is absurdly wasteful. We fill large 40- to 50-gallon storage tanks, then pour energy into them 24/7, year after year, to ensure we have hot water whenever we need it.

However, this is not always the case. If a teenager takes a long shower or a spouse relaxes in the tub, it can take a long time for the emptied tank to reheat. Then there are the persistent concerns: Is it clogged with energy-sucking sediment? Is it going to burst? Both are valid concerns, given that tanks typically fail in 8 to 12 years.

Tankless Water Heater Installation: Is It Worth It?

A tankless water heater is a type of water heater that heats water on demand, rather than storing it in a tank like a traditional water heater. One of the main advantages of a tankless water heater is that it can provide an endless supply of hot water, as it only heats water as it is needed. This can be more energy efficient than a traditional water heater, as it doesn’t have to keep a large tank of water constantly heated.

The installation of a tankless water heater can be more complex than a traditional water heater, as it requires additional piping and venting. It is generally recommended that a tankless water heater be installed by a professional, as it can be difficult to do the installation correctly if you are not familiar with the process.

Overall, whether or not it is worth it to install a tankless water heater will depend on your individual circumstances. If you have a large household with a high demand for hot water, or if you are looking to save energy and reduce your carbon footprint, a tankless water heater may be a good investment. However, it is important to consider the upfront cost of installation and the ongoing cost of maintaining the system, as well as any potential disruptions to your home during the installation process. It is a good idea to do your research and consult with a professional to determine whether a tankless water heater is the right choice for your home.

How Does a Tankless Water Heater Work?

A tankless water heater, also known as an on-demand water heater, works by heating water as it is needed, rather than storing it in a tank like a traditional water heater. When a hot water tap is turned on, cold water is drawn into the tankless water heater and passes through a heating element, which raises the temperature of the water. The heated water is then delivered to the faucet or appliance, and the process is repeated as needed.

Tankless water heaters are typically more energy efficient than traditional water heaters, as they do not have to keep a large tank of water constantly heated. They are also able to provide an endless supply of hot water, as they heat the water on demand rather than relying on a limited supply in a tank.

There are two main types of tankless water heaters: gas-fired and electric. Gas-fired tankless water heaters use natural gas or propane to heat the water, while electric tankless water heaters use electricity. Both types of tankless water heaters have their own advantages and disadvantages, and the best choice will depend on your individual circumstances and needs.

Overall, a tankless water heater is a convenient and efficient way to heat water in your home, as it can provide an endless supply of hot water and can be more energy efficient than a traditional water heater.

1. A tankless water heater heats water on demand, rather than storing it in a tank like a traditional water heater.
2. When a hot water tap is turned on, cold water is drawn into the tankless water heater.
3. The cold water passes through a heating element, which raises the temperature of the water.
4. The heated water is then delivered to the faucet or appliance.
5. The process is repeated as needed, providing an endless supply of hot water.
6. Tankless water heaters are typically more energy efficient than traditional water heaters, as they do not have to keep a large tank of water constantly heated.
7. There are two main types of tankless water heaters: gas-fired and electric.
8. Gas-fired tankless water heaters use natural gas or propane to heat the water, while electric tankless water heaters use electricity.
9. Both types of tankless water heaters have their own advantages and disadvantages.
10. A tankless water heater is a convenient and efficient way to heat water in your home, as it can provide an endless supply of hot water and can be more energy efficient than a traditional water heater.

How Much Does a Tankless Water Heater Cost?

The cost of a tankless water heater can vary significantly depending on the size of the unit and the type of fuel it uses. On average, a tankless water heater can cost anywhere from $1,000 to $3,000, including the cost of installation. However, some high-end models can cost as much as $5,000 or more.

One of the main factors that can affect the cost of a tankless water heater is the size of the unit. Tankless water heaters are rated by the maximum flow rate they can handle, measured in gallons per minute (GPM). A larger unit with a higher flow rate will be more expensive than a smaller unit with a lower flow rate. It is important to choose a tankless water heater that is appropriately sized for your household’s hot water needs, as a unit that is too small may not be able to meet your demand, while a unit that is too large may be unnecessarily expensive.

The type of fuel used by the tankless water heater can also affect its cost. Gas-fired tankless water heaters tend to be more expensive to purchase and install than electric tankless water heaters, but they can be more cost-effective to operate in the long run, as natural gas and propane are generally cheaper than electricity. Electric tankless water heaters are typically less expensive to purchase and install, but they can be more expensive to operate, as electricity is generally more expensive than natural gas or propane.

It is important to consider the ongoing operating costs of a tankless water heater, as well as the initial purchase and installation costs. A tankless water heater can be more energy efficient than a traditional water heater, which can lead to significant savings on your energy bills over time. However, it is a good idea to do your research and consult with a professional to determine the best option for your home. Factors to consider when deciding whether a tankless water heater is the right choice for you include the size of your household, your hot water usage patterns, the availability and cost of different types of fuel in your area, and any applicable tax credits or rebates.

How to Install a Tankless Water Heater

Installing a tankless water heater can be a complex process, and it is generally recommended that it be done by a professional. However, if you are experienced with plumbing and are comfortable working with gas or electricity, you may be able to install a tankless water heater yourself. It is important to carefully follow all instructions provided by the manufacturer and to adhere to local building codes and regulations.

Here is a general overview of the steps involved in installing a tankless water heater:

1. Choose a location for the tankless water heater: Tankless water heaters should be installed in a location with good air circulation and easy access to fuel and water lines.
2. Install the venting: Tankless water heaters require proper venting to ensure safe and efficient operation. The type of venting system required will depend on the type of fuel used by the tankless water heater (natural gas, propane, or electricity).
3. Install the gas or electrical connections: Tankless water heaters run on either natural gas or electricity. If you are installing a gas-fired tankless water heater, you will need to connect it to a gas line. If you are installing an electric tankless water heater, you will need to connect it to an electrical circuit.
4. Install the water connections: Tankless water heaters require both hot and cold water lines. You will need to connect the water lines to the appropriate inlets on the tankless water heater using the appropriate fittings.
5. Test the tankless water heater: Once all of the connections are made, you should test the tankless water heater to ensure that it is working properly. This may involve turning on the hot water tap and allowing the tankless water heater to heat the water, or it may involve running a diagnostic test using the tankless water heater’s control panel.

Installing a tankless water heater can be a complex process, and it is important to carefully follow all instructions provided by the manufacturer and to adhere to local building codes and regulations. If you are not confident in your ability to install a tankless water heater, it is recommended that you hire a professional.

Tankless Water Heater Maintenance

Maintaining a tankless water heater can help to ensure that it operates efficiently and effectively for a long time. Here are some tips for maintaining your tankless water heater:

1. Flush the system: Tankless water heaters should be flushed periodically to remove any sediment or debris that may have accumulated in the system. This can be done using a hose and a special flushing kit, or by a professional.
2. Clean the burners: If you have a gas-fired tankless water heater, it is important to keep the burners clean to ensure that they are operating efficiently. This can be done by using a special cleaning solution and following the instructions provided by the manufacturer.
3. Replace the air filter: Some tankless water heaters have an air filter that should be replaced regularly. Consult the manufacturer’s instructions for the recommended replacement schedule.
4. Inspect the venting system: The venting system for a tankless water heater should be inspected periodically to ensure that it is in good condition and free of obstructions.
5. Check the water quality: The quality of the water that is used in your tankless water heater can affect its performance. If you have hard water, it may be necessary to install a water softener or to use a special treatment to protect the tankless water heater from scale buildup.

By performing regular maintenance on your tankless water heater, you can help to ensure that it operates efficiently and effectively for a long time. If you are not comfortable performing maintenance on your tankless water heater, it is recommended that you hire a professional.

How Long Do Tankless Water Heaters Last?

Tankless water heaters are generally more durable and have a longer lifespan than traditional tank water heaters. On average, a tankless water heater can last for 20 years or more, depending on various factors such as the quality of the unit, the quality of the installation, and the frequency and quality of maintenance.

Well-maintained tankless water heaters can last for 20 years or more, while poorly maintained or improperly installed units may only last for a few years. It is important to follow the manufacturer’s instructions for maintenance and to have the tankless water heater inspected and serviced regularly to ensure that it is operating efficiently and effectively.

One of the main advantages of a tankless water heater is that it does not have a tank, which is the component that is most prone to failure in a traditional water heater. Tankless water heaters also have fewer moving parts, which can help to reduce the risk of breakdowns.

Overall, a tankless water heater can be a durable and long-lasting addition to your home, provided that it is properly installed and well-maintained.

Where Can I Buy One?

There are several places where you can buy a tankless water heater, including:

1. Home improvement stores: Many home improvement stores, such as Home Depot and Lowe’s, carry a wide selection of tankless water heaters. You can shop online or visit a store in person to browse the available options.
2. Plumbing supply stores: Plumbing supply stores typically carry a wide range of tankless water heaters and other plumbing products.
3. Online retailers: There are many online retailers that sell tankless water heaters, including Amazon, eBay, and Tankless Water Heater Guys.
4. Manufacturer’s website: You can also purchase a tankless water heater directly from the manufacturer’s website. This can be a good option if you want to buy a specific brand or model.

When shopping for a tankless water heater, it is important to consider the size of the unit, the type of fuel it uses, and the cost, as well as any warranties or guarantees offered by the manufacturer. It is also a good idea to read reviews and do your research to ensure that you are buying a high-quality product.

Pros and Cons of Tankless Water Heaters

Tankless water heaters, also known as on-demand water heaters, have several benefits and drawbacks compared to traditional tank water heaters. Here are some of the pros and cons of tankless water heaters:

Pros:

1. Endless hot water: Tankless water heaters heat water on demand, so they can provide an endless supply of hot water.
2. Energy efficiency: Tankless water heaters are generally more energy efficient than traditional tank water heaters, as they do not have to keep a large tank of water constantly heated.
3. Compact size: Tankless water heaters are much smaller and more compact than traditional tank water heaters, which can be a benefit if you have limited space in your home.
4. Long lifespan: Tankless water heaters are generally more durable and have a longer lifespan than traditional tank water heaters.

Cons:

1. Initial cost: Tankless water heaters can be more expensive to purchase and install than traditional tank water heaters.
2. Limited flow rate: Tankless water heaters have a limited flow rate, which means that they may not be able to provide hot water to multiple fixtures at the same time.
3. Cold water sandwich: When a tankless water heater is activated after a period of disuse, it can take a few seconds for the hot water to reach the faucet. This can result in a “cold water sandwich,” where cold water is drawn into the tankless water heater and mixed with the hot water, resulting in lukewarm water at the tap.
4. Special venting required: Tankless water heaters require special venting to ensure safe and efficient operation, which can add to the cost of installation.

Overall, the pros and cons of tankless water heaters will depend on your individual circumstances and needs. It is a good idea to do your research and consult with a professional to determine whether a tankless water heater is a right choice for your home.

New Tankless Water Heater Technology

There have been a number of recent developments in tankless water heater technology that have improved the efficiency and performance of these systems. Here are some examples of new tankless water heater technology:

1. Condensing tankless water heaters: Condensing tankless water heaters are designed to capture the heat that is normally lost during the combustion process, which can increase their efficiency. These units typically have two heat exchangers, one for the primary heating process and one for the condensing process.
2. Hybrid tankless water heaters: Hybrid tankless water heaters combine the technology of a tankless water heater with that of a traditional tank water heater. These units have a small tank that stores hot water, which can help to reduce the “cold water sandwich” effect that can occur when a tankless water heater is activated after a period of disuse.
3. Advanced control systems: Some tankless water heaters have advanced control systems that can optimize the performance of the unit based on the temperature and flow rate of the water, as well as the outside temperature. These systems can help to increase the efficiency and accuracy of the tankless water heater.
4. Connected technology: Some tankless water heaters have the ability to connect to the internet and can be controlled and monitored using a smartphone app or other connected device. This can allow you to remotely monitor and control your tankless water heater, as well as receive notifications if there are any issues with the unit.

Overall, new tankless water heater technology is helping to improve the efficiency and performance of these systems, making them an increasingly popular choice for homeowners.

What Size Tankless Water Heater Do I Need?

When choosing a tankless water heater, it is important to select a unit that is appropriately sized for your household’s hot water needs. Tankless water heaters are rated by the maximum flow rate they can handle, measured in gallons per minute (GPM). A larger unit with a higher flow rate will be able to provide hot water to multiple fixtures at the same time, while a smaller unit with a lower flow rate may only be able to support one fixture at a time.

To determine the size of tankless water heater you need, you will need to consider the number of fixtures in your home that will be using hot water simultaneously, as well as the desired flow rate for each fixture. For example, if you have a home with two bathrooms, each with a shower and a sink, you may need a tankless water heater with a flow rate of around 6-8 GPM.

It is generally recommended that you choose a tankless water heater that is slightly larger than your calculated hot water needs, as this will provide a buffer for future demand and help to ensure that you have an adequate supply of hot water.

It is also a good idea to consult with a professional when selecting a tankless water heater, as they can help to ensure that you choose a unit that is appropriately sized for your home.

Btus Output Estimate

Don’t want to do the math? Use these figures to estimate how much heater output you’ll need.

• 1 bathroom, 1–2 people: 140,000 Btus
• 2 bathrooms, 2–3 people: 190,000 Btus
• 3 bathrooms, 3–5 people: 380,000 Btus

Fixture flow rates

• Showerhead: 1.25–2.5 gpm
• Kitchen or bath faucet: 1.5–2.2 gpm
• Tub filler faucet: 4 gpm
• Dishwasher: 1–2.5 gpm
• Washing machine: 1.5–3 gpm

How to Determine gpm?

To determine a fixture’s actual gpm, time how long it takes to fill a bucket to the 1-quart mark. gpm is calculated by dividing 15 by the number of seconds.

Electric Tankless Water Heater Facts

Homes without a gas line or a propane tank can benefit from on-demand hot water by installing tankless electric units. These units, which use thick copper rods to heat water, are quieter and about one-third the size of gas or propane tankless heaters. They can also be installed almost anywhere because they don’t require vents, including under sinks and in small closets.

One disadvantage of electric units is their limited output, which is limited to 36 kilowatts, or approximately 123,000 Btus. In areas with warm groundwater, that may be enough to supply an entire house, but in colder climates, they’re better suited to point-of-use service, where demand for hot water isn’t too high. Whichever type you choose, it will require enough amperage at the main panel as well as heavy-gauge wires.

Furthermore, electric heaters last roughly half as long as gas heaters: typical warranties range from three to five years. When the heating elements fail, it is usually more expensive to replace the entire heater than it is to replace the elements.

Tankless Water Heater Installation

What you & your plumber need to assess before installation day:

Gas Line

To function properly, the burner in a tankless heater must be connected to a gas supply line that delivers enough volume at sufficient pressure. In many cases, this means increasing the diameter of the supply pipe to 34 inch. If the pressure drops, the gas company will have to adjust the meter’s regulator.

Some tankless units, such as those made by Rheem, can work with a standard 12-inch gas line as long as it is not longer than 24 feet.

Venting

Noncondensing tankless gas heaters have vents made of stainless steel that can withstand high exhaust temperatures. Condensing units use less expensive PVC pipes and have a cooler exhaust. Because only one hole in the wall is required for a concentric vent, which has an exhaust pipe inside a larger air-intake pipe, installation is simplified.

In the past, vent runs were typically limited to 10 feet. However, more powerful fans, such as those found in Rinnai’s Sensei series, now allow vents to extend up to 150 feet.

Water Hardness

The formation of scale deposits in a heat exchanger (or on electric heating elements) slows heat transfer and restricts water flow. If you already have whole-house water softening, the scale will not be an issue. However, if your water is not softened and its hardness exceeds 120 milligrams per liter, it is worthwhile to invest in a treatment system.

A dedicated, point-of-use cartridge, such as the TAC-ler water conditioner (Stiebel Eltron), modifies hardness without the use of salt or other chemicals.

Outdoor Tankless Water Heater

If your climate and local codes allow, consider the benefits of hanging a heater outside.

Saves space: You’ll have one less appliance to make room for inside.
Simple to set up: The built-in exhaust vent eliminates the need to cut a large hole (or two) through the house’s side.
Simple to service: Whether you’re at home or not, a plumber can come out at any time. However, keep in mind…
Construction regulations: To put it outside, you may need to get permission from your local building department.

Cold weather: Internal heaters keep components warm down to 22 degrees F, but exposed water pipes must be insulated and wrapped in heat tape that activates automatically in freezing temperatures. South of the Mason-Dixon Line, frozen pipes are less of an issue.

Do you need assistance with home repairs? A home warranty may be beneficial. Check out the Trendz 4 Friend Reviews Team’s in-depth guides.