Water Heaters

The Ultimate Guide to Electric Tankless Boilers


The Ultimate Guide to Electric Tankless Boilers

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Many modern homes and commercial properties are always on the lookout for energy-efficient alternatives for their usual heating systems. The demand for these powerful yet environmentally-friendly solutions often centres on one popular option: the electric tankless boiler. An electric tankless boiler is an advanced heating tool delivering efficient operation, cost-effectiveness and a myriad of other benefits that conventional heaters may not offer.

Understanding the Concept of Electric Tankless Boilers

An electric tankless boiler, also known as an instantaneous boiler, is a compact, efficient and intelligent solution designed to deliver hot water on demand. As opposed to traditional boilers that constantly heat and store a specific amount of water in a huge tank, these devices only heat water as it passes through the unit, providing hot water only when required and reducing energy wastage.

The Inner Workings of an Electric Tankless Boiler

Electric tankless boilers employ a direct heating mechanism that uses electric elements to heat the water. As soon as you turn on a hot water tap in your home or commercial area, cold water moves into the tankless boiler via a pipe. The electric elements in the boiler then heat the water as it moves across these elements, delivering hot water at your tap instantly.

Key Features of Electric Tankless Boilers

There are several impressive features of tankless boilers:

  • Constant Hot Water Supply: Unlike traditional tank heaters, which can run out of hot water, an electric tankless boiler provides a continuous flow of hot water.

  • Energy Efficient: Electric tankless boilers are high in energy efficiency because they heat water only when it's needed, reducing the wasted energy associated with heating and storing water in traditional tank boilers.

  • Space-Saving: As there's no need for bulky tanks, electric tankless boilers are compact, easy to install and perfect for homes with limited space.

  • Longevity: With fewer components to wear out or break, electric tankless boilers tend to last longer than conventional boilers, cutting down on replacement costs.

Selecting the Right Electric Tankless Boiler

There are several factors to consider when choosing an electric tankless boiler. Issues like the size of your property, your hot water demands, energy efficiency goals, and budget constraints. It would be best to consult an expert in HVAC installation to help you make the best-informed decision.

The Impact of Electric Tankless Boilers on Energy Bills

Electric tankless boilers can lower your energy bills due to their on-demand, energy-efficient operation. According to Energy.gov, homes using tankless boilers for less than 41 gallons of hot water daily can enjoy 24% to 34% energy efficiency compared to conventional tank heaters. That means great potential for savings on your utility bills.

Installation and Maintenance of Electric Tankless Boilers

Installation and maintenance of electric tankless boilers should always be performed by professionals. Although they are compact and easier to install, improper installation can lead to inefficiency, high energy costs, and shortened lifespans for these devices. Regular professional maintenance is essential to ensure optimal performance and longevity.

Electric tankless boilers represent a significant advancement in heating technology, offering a host of advantages over traditional heaters. With their energy efficiency, constant hot water supply, compact size, and longevity, these modern heating solutions are becoming increasingly popular in homes and commercial properties. Whether you're building a new home, remodeling your existing one or simply looking to upgrade your heating system, an electric tankless boiler could be an excellent choice.

Frequently Asked Questions about Electric Tankless Boilers

How does an electric tankless boiler work?

Electric tankless boilers, also known as on-demand boilers, operate by heating water only when needed. When a hot water tap is turned on, cold water travels through a pipe into the unit. Here, an electric element heats the water that gets delivered straight to your fixtures. Unlike traditional storage tank boilers, it doesn't waste energy storing hot water.

What makes electric tankless boilers different from conventional boilers?

Unlike conventional boilers that store and continuously heat large amounts of water in a tank, electric tankless boilers heat water directly without the need for a tank. Hence, they eliminate the standby energy losses associated with maintaining a tank full of hot water, thereby providing an efficient alternative.

How energy efficient are electric tankless boilers?

Electric tankless boilers are generally more energy efficient than conventional boilers. They only heat water as needed, reducing the energy wasted on maintaining a tank full of hot water. The actual energy savings can vary based on factors like the boiler's size and usage patterns.

Are electric tankless boilers reliable for continuous hot water supply?

Yes, electric tankless boilers are designed to provide a continuous supply of hot water, as long as the flow rate doesn't exceed the heating capacity of the unit.

What factors should I consider while choosing an electric tankless boiler?

When selecting an electric tankless boiler, consider factors such as the size of your home, the number of appliances needing hot water, your climate, and the groundwater temperature in your area. These will influence the boiler's size and power requirement.

Will an electric tankless boiler work if I live in a cold climate?

Yes. However, the lower the incoming water temperature, the lower the flow rate you are likely to get. An electric tankless boiler in a cold climate would need to be rated to handle the demand of your household during the coldest time of the year.

How long is the life expectancy of an electric tankless boiler?

With proper care and maintenance, an electric tankless boiler can last up to 20 years, which is longer than conventional boilers. The absence of a tank makes them less susceptible to leaks and rust.

How can I maintain an electric tankless boiler?

Maintenance for electric tankless boilers includes periodic descaling, especially in areas with hard water. However, consult your manufacturer’s manual for specific maintenance requirements.

What are typical costs associated with installing an electric tankless boiler?

The installation costs of an electric tankless boiler can vary greatly depending on the complexity of the installation and any necessary modifications. However, costs generally fall into the range of $1,000 -$2,500, excluding the price of the unit.

Can I install an electric tankless boiler myself?

While it may look like a simple task, it's recommended to hire a licensed professional for installing an electric tankless boiler. It involves dealing with plumbing and electric connections, meaning a single mistake could pose a safety hazard or damage your new boiler.

Are there any government rebates or incentives for installing electric tankless boilers?

Depending on your area, there are often government and utility company rebates, incentives, and tax credits available for installing energy-efficient appliances like electric tankless boilers. Always remember to research any available offers before purchasing a new unit.

Pros of Electric Tankless Boilers

Energy Efficiency

The electric tankless boiler delights users with its superb energy efficiency. Unlike traditional water heaters, these boilers only heat water as needed, reducing energy consumption. This can result in significant energy savings over time.

  • On-Demand Hot Water: This model only heats water as it is needed, ensuring instant hot water with no wait time.
  • Lower Energy Bills: By using less energy to heat the water, consumers can see a noticeable decrease in their energy bills.

Longer Lifespan

Another notable advantage of electric tankless boilers is their extended lifespan. A well-maintained tankless boiler can last up to 20 years, which is significantly longer than traditional boilers.

  • Long-Term Savings: Although the upfront cost might be higher than traditional boilers, the long lifespan means less frequent replacements, translating to long-term savings.
  • Warranty Coverage: Since these units last longer, manufacturers often provide extended warranty periods.


For homes with limited space, an electric tankless boiler can be the perfect solution. These systems are compact and can be mounted on walls, making them ideal for apartments, small homes, and other space-constrained areas.

Cons of Electric Tankless Boilers

High Upfront Cost

The initial cost of purchasing and installing an electric tankless boiler can be significantly higher than traditional water heaters.

  • Expensive Installation: Specialized plumbing and electrical systems might be needed, driving up the installation cost.
  • Higher Purchase Price: The price of the unit itself is typically higher than other types of water heaters.

Difficult Installation

The installation of electric tankless boilers can be quite complex and requires the skills of a qualified plumber and electrician.

  • Need for Skilled Labor: This not only increases the cost but may also lengthen the installation time.
  • Specific Requirements: For instance, some models require a dedicated electric circuit.

Hot Water Output

While electric tankless boilers can supply hot water on demand, they may struggle to meet needs if multiple outlets require hot water simultaneously.

  • Capacity Limitations: These boilers work best in households with low hot water demand or where hot water use can be scheduled.
  • Additional Units: For larger households, installing multiple units may be necessary, which could be costly.

Dependence on Electricity

Lastly, the dependence on electricity can be a downside for some users. In the event of a power outage, the electric tankless boiler will not function, leaving the home without hot water until power is restored.

  • Power Outages: This can be a significant inconvenience, particularly in areas prone to frequent or long-lasting power outages.
  • Energy Costs: Depending on the local cost of electricity, operating an electric tankless boiler may be more expensive than other heating options.

In deciding whether the electric tankless boiler is the right match for your needs, these pros and cons can help guide your decision-making process. Weighing the benefits of energy efficiency, a longer lifespan, and space-saving design against the negatives like higher upfront costs, potential capacity limitations, and dependence on an electric power supply will point you to a well-informed choice.


Tankless boilers are your best bet when it comes to energy efficiency and saving space. An electric tankless boiler is compact and fits in your closet without a hitch. Plus, it doesn’t waste energy by heating and storing water which is not needed immediately. This means considerable savings on your monthly utility bills.

The future of water heating systems lies in the electric tankless boiler. It easily caters to your on-demand water heating needs, providing you with hot water whenever you require. With increased longevity and lesser maintenance hassles, it's no surprise that more people are making the switch.

Overall, an electric tankless boiler makes perfect sense for any homeowner looking to go green. It reduces carbon footprint, is energy efficient and offers a seamless supply of hot water. Switching to an electric tankless water heater is a small change, but it goes a long way in fostering a sustainable lifestyle.

About West Coast Hydronics & Plumbing

West Coast Hydronics & Plumbing is a trusted plumbing company based in Sacramento, CA. With a steadfast dedication to unparalleled customer service and top-of-the-line plumbing expertise, we've secured our reputation as a trusted plumber that you can count on. We specialize in a wide range of services including hydronic heating solutions, drain cleaning, pipe repair, and more. We are always ready to roll up our sleeves and tackle any plumbing issue you can throw at us. Check out more about our services and incredible team here.