Tankless Hot Water Shower: A Comprehensive Overview

A tankless hot water shower is a game-changer for households with limited space or high hot water demands. These systems provide continuous hot water on demand, without the need for a traditional tank.

They can be more energy-efficient than traditional tank-based systems, with some models using up to 22% less energy. This is because they only heat water as needed, rather than constantly heating and re-heating water in a tank.

The cost of a tankless hot water shower can vary widely, depending on factors such as the type of system, its size, and the installation costs.

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When choosing a tankless hot water shower, it's essential to consider the type of point-of-use (POU) water heater that best fits your needs. You'll want to think about how you plan to use it, so let's consider the options.

There are two main types of POU water heaters to consider: electric and gas. Electric POU water heaters are a popular choice for their ease of installation and lower upfront cost, but gas models can provide more consistent heat and are often more energy-efficient.

To determine which type is best for you, ask yourself how you'll use the POU water heater. Will it be for a single sink or shower, or will you need to heat water for multiple fixtures?

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A gas engine is essentially a small gas burner that can run off propane or natural gas, which is a key component of gas-powered tankless water heaters.

It allows for higher flow rates, in some cases up to 5 gallons per minute (GPM), making it suitable for homes with multiple faucets or appliances in use at the same time.

One of the main drawbacks of using a gas engine is that it relies on fossil fuel sources of energy, which may not align with an all-electric home powered by renewable sources of energy.

Gas-powered tankless water heaters require ventilation outside the house, increasing installation costs.

A gas-powered water heater could save your family around $100 each year, allowing for a payback period between 2 and 6 years.

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An electric tankless water heater is a type of on-demand heater that uses a powerful electric heating element to heat water as it passes through the unit. This type of heater is known for its efficiency, delivering an average savings of $100 per year.

The powerful heating element in electric tankless water heaters can be a concern for some homeowners, as it may require an upgrade to their home's electrical panel.

Tankless showers are a great option for those who want a constant supply of hot water without the need for a storage tank. They work by heating water instantaneously as it flows through a heat exchanger, delivering hot water at a rate of 2-5 gallons per minute.

There are different types of tankless showers, each with its own benefits and drawbacks. For example, gas-fired tankless water heaters produce higher flow rates than electric ones, making them a good choice for larger households.

If you're considering a tankless shower, it's essential to think about how you'll use it and where it will fit into your existing plumbing. You'll also want to consider the limitations of tankless water heaters, which can't supply enough hot water for simultaneous, multiple uses in large households.

Here are some common types of tankless showers:

Booster tankless water heaters can be a good solution for households with multiple hot water needs, but they can be expensive and may not be worth the additional cost.

Tank or tankless POU water heaters are a great option for small spaces or light uses. They're perfect for a guest bathroom sink where you don't need a high volume of hot water.

Tank POU water heaters are a good choice for light uses because they draw less electricity. They're also a great option for areas with limited space.

Tankless POU water heaters, on the other hand, can handle frequent demand and fit almost anywhere. However, be aware that some tankless POU units can require up to 150 amps of electricity.

Remember to always consult an electrician to ensure you have enough electricity to power the unit, especially if you're planning to install a tankless POU water heater.

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To determine the right size of a tankless water heater, you need to consider both the temperature rise and the flow rate. The temperature rise is how hot the device can heat water, while the flow rate refers to the number of gallons of water effectively heated and distributed to the home.

A typical point-of-use (POU) heater has a temperature rise between 65 and 75 degrees Fahrenheit and a flow rate of between 1 and 5 GPM. Smaller, under-the-sink types of POU heaters that only heat water for faucets might have lower flow rates of 0.5 GPM.

To properly size the water heater for POU uses, consider your faucet or showerhead's flow rate. A low-flow showerhead generally has a flow rate of about 2.5 GPM, so you'll need an option that has a flow rate at least equal to that.

To correctly determine the optimum size of your tankless water heater, follow these steps:

For example, let's say you need a tankless water heater to power two showers and two sinks. You have low-flow showerheads that use 1.8 GPM and faucet aerators with flow rates of 1.2 GPM, so you need a maximum flow rate of 6 GPM.

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Installing a tankless hot water shower is a bit more complicated than it seems. Unless you have serious DIY construction abilities, it's best to hire a professional for installation.

You'll need to decide whether to use a point-of-use (POU) water heater alone or with a centralized water heater. POU units are better for larger homes with longer distances to faucets.

POU units can be a great backup for central storage tank water heaters, especially in homes with large families. If one family member takes an extra-long shower, there will be some water left for you if you use both a POU and central storage tank water heater.

Professional installers know about mandatory gas shut-off valves and how to install them correctly. Electrical connections and vents also require expertise to install safely.

Hiring a professional is recommended, especially if a hard-wired electrical connection is needed.

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Tankless hot water showers can be a great option for homes that use 41 gallons or less of hot water daily, as they can be 24%–34% more energy efficient than conventional storage tank water heaters.

They can also be more energy efficient for homes that use a lot of hot water, around 86 gallons per day, saving 8%–14% in energy costs.

However, the initial cost of a tankless water heater is greater than that of a conventional storage water heater.

But, tankless water heaters typically last longer, with a life expectancy of more than 20 years, and have lower operating and energy costs, which could offset their higher purchase price.

Advantages of tankless water heaters include being 24%–34% more energy efficient than conventional storage tank water heaters for homes using 41 gallons or less of hot water daily.

They can also last longer, typically over 20 years, with easily replaceable parts that may extend their life by many more years. In contrast, storage water heaters last 10–15 years.

Tankless water heaters avoid standby heat losses associated with storage water heaters. However, gas-fired tankless water heaters can waste energy if they have a pilot light, which can sometimes offset the elimination of standby energy losses.

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The cost of operating a pilot light in a tankless water heater varies from model to model, so it's essential to review the manufacturer's literature.

Here are some key differences between tankless and storage water heaters:

By considering these advantages and disadvantages, you can make an informed decision about whether a tankless water heater is right for you.

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Point of use tankless water heaters are generally much smaller than centralized versions, making them ideal for tiny spaces like under the sink or in the bathroom closet.

They're a good option for households with relatively low hot water requirements, around 20-25 gallons per day.

POU water heaters can be installed at the source, virtually anywhere you need hot water, including showers, kitchen and bathroom sinks, and even dishwashers and washing machines.

Having a POU water heater in the shower can provide instant hot water, which is a game-changer for long waits.

In the kitchen, a POU water heater at the sink can help reduce energy waste by heating up faster than traditional models.

POU electric tank water heaters use a heating element to convert electrical energy into heat energy, while tankless units heat incoming cold water as it passes through the unit.

Electric POU tankless water heaters require higher amps of electricity than tank units to quickly raise the temperature of the passing cold water.

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A 3,500 square foot home with five bathrooms might not be an ideal candidate for POU heaters due to the need for multiple units.

However, POU water heaters can provide greater control over where hot water is directed, and can be a good option for households with relatively low hot water requirements.

Here are some common applications for POU water heaters:

The Environmental Protection Agency estimates that the average residential faucet uses about 2 gallons of water per minute, making the kitchen sink a likely candidate for a POU water heater.

A tankless hot water shower can be a significant investment, but it's worth considering the long-term benefits. The upfront cost of a tankless water heater can range from $1,000 to $3,000.

You can find more affordable options, like the 2.5-gallon Bosch electric on-demand heater, which costs under $150 on Amazon. However, this smaller unit is designed for point-of-use applications, not a whole-house setup.

The energy savings from a tankless water heater can eventually offset the higher upfront cost, but it may take many years to recoup your investment.