Onsen hot water heaters are innovative systems that not only offer a continuous supply of hot water, but also boast energy efficiency and anti-frost protection. Are you ready to dive into the world of Onsen and experience the luxury of endless hot water?

In this comprehensive Onsen hot water review blog post, we will explore the key features of Onsen hot water systems, compare them to other types of hot water systems, discuss installation and maintenance, and share customer reviews and testimonials. Let’s embark on this journey towards endless hot water bliss!

Key Takeaways

  • Onsen hot water systems provide efficient and durable hot water solutions with a 6-star energy rating, anti-frost protection feature, and the ability to cater to households of up to four adults.

  • Installation requires professional expertise for optimal performance and reliability. Regular inspections are recommended for maintenance.

  • Onsen systems offer reliable performance, durability, energy efficiency & customer satisfaction due to their dependable hot water solution.

Onsen Hot Water Systems Overview

A natural gas hot water system that delivers an endless supply of hot water

Onsen hot water systems are a game-changer in the world of home heating solutions. Powered by natural gas, these continuous flow systems provide an endless supply of hot water up to 50°C. With a 6-star energy rating, they operate efficiently, ensuring energy is only consumed when the hot water is turned on. Moreover, the anti-frost protection feature offers peace of mind, keeping the system operational even in colder temperatures.

Designed for extended service life, these durable hot water unit systems can cater to households with up to four adults. The unit sits neatly outdoors, giving you more space inside your home while providing clean, hot water on demand. It’s no wonder Onsen hot water systems are a popular choice for Onsen hot pools and cedar hot tubs, bringing the luxury of endless hot water to your home.

Endless Supply

One of the most significant advantages of Onsen systems is the endless supply of hot water they provide. Gone are the days of waiting for the water to heat up or running out of hot water during a shower. The continuous flow gas hot water system ensures energy consumption only occurs when hot water is in use, making it one of the most energy-efficient ways to heat water.

With an Onsen system, you can enjoy the luxury of endless hot water while saving money on your energy bills.

Energy Efficiency

Energy efficiency is a crucial factor to consider when selecting a hot water system. Onsen hot water systems excels in this department, boasting a 6-star energy rating and an efficient heat exchanger. By choosing an energy-efficient system like Onsen, you not only contribute to a greener planet, but also save on energy costs in the long run. In fact, onsen is one of the more energy efficient ways to heat water for your home.

In fact, Onsen systems are a popular choice for Onsen hot pools, where high efficiency is essential in maintaining the perfect hot pool temperature.

Onsen energy rating

Anti-Frost Protection

The anti-frost protection feature in Onsen hot water systems is a vital component that ensures the system remains operational in cold weather. By detecting low temperatures and activating a heating element, it prevents freezing in the system, safeguarding it from potential damage caused by low temperatures.

This feature not only prolongs the lifespan of the system, but also minimizes the need for expensive repairs, making it suitable for both colder and warmer climates.

Comparing Onsen to Other Hot Water Systems

Now that we have explored the benefits of Onsen hot water systems, let’s see how they compare to other types of hot water systems, such as storage tank systems and heat pump systems. Understanding the differences between these systems will help you make an informed decision on which system is best suited to your needs.

Each type of hot water system has its own advantages and disadvantages. In the following sections, we will delve deeper into the characteristics of storage tank systems and heat pump systems, comparing them to the Onsen hot water systems.

Storage Tank Systems

Storage tank systems store a specific amount of heated water for use throughout the day. While these systems are generally more economical, they require a large enough tank to prevent running out of hot water during a shower. Additionally, storage tank systems can take advantage of off-peak electricity, further reducing energy costs.

However, storage tank systems also come with their downsides. The tanks require space, which could be an issue for smaller homes. Furthermore, they tend to be less energy efficient compared to Onsen systems, as they require constant heating of the stored water. In contrast, Onsen systems only consume energy when hot water is in use, making them a more environmentally friendly and cost-effective choice.

Heat Pump Systems

Heat pumps systems don’t generate heat directly. Instead, they use electricity to transfer heat from one area to another. While they are typically more expensive to purchase than Onsen hot water systems, they offer greater energy efficiency and can save up to 80% on hot water costs.

However, heat pump systems come with their own set of drawbacks. They can be quite noisy and may require a higher initial investment than Onsen systems. Additionally, they are powered by electricity, which may not be as environmentally friendly as natural gas-powered Onsen systems.

Ultimately, the choice between these systems will depend on your specific needs, preferences, and budget.

Installation and Maintenance

A technician installing an Onsen hot water system outdoors

Once you have decided on the Onsen Hot Water System that best suits your needs, the next step is to ensure proper installation and maintenance. In this section, we will discuss the installation process, maintenance requirements, and warranty information for Onsen systems.

By understanding the installation and maintenance procedures, you can ensure the longevity and optimal performance of your Onsen Hot Water System, providing you with endless hot water for years to come.

Installation Process

The installation process for Onsen hot water systems is straightforward but requires the expertise of a professional. The system must be installed in an above-ground, open-air position with natural ventilation. Depending on your home’s gas system, it is essential to ensure access to gas reticulation is available.

While the installation cost may vary, investing in a proper installation will ensure the long-term performance and reliability of your Onsen system.

Maintenance Requirements

One of the great benefits of Onsen hot water systems is their minimal maintenance requirements. It is recommended to perform an annual check to confirm that all system components are operating correctly. Regular inspections and cleaning will ensure the system’s efficiency and safety.

By following these simple maintenance steps, you can enjoy the endless hot water supply provided by your Onsen system without any worries.

Warranty Information

Onsen hot water systems come with a minimum 7-year warranty, reflecting the manufacturer’s confidence in the quality and durability of the product. This warranty coverage includes both parts and labor, providing peace of mind and assurance in your investment.

When purchasing an Onsen system, it is essential to familiarize yourself with the warranty information to fully understand the coverage and support provided.

Sizing Your Onsen Hot Water System

Choosing the right Onsen Hot water system for your home involves taking into account factors such as household size and hot water usage. By considering these factors, you can select the system that will best meet your hot water needs, ensuring a comfortable and enjoyable experience for everyone in your home.

In this section, we will discuss the importance of household size and hot water usage when sizing your system. By understanding how these factors impact your system’s performance, you can make an informed decision and enjoy the luxury of endless hot water.

Household Size

The size of your household plays a crucial role in determining the appropriate Onsen hot water system for your home. As the number of occupants in your household increases, so does the demand for hot water. It is essential to select a system that can cater to the hot water needs of your entire household, ensuring everyone has access to hot water when they need it.

By considering the size of your household when selecting an Onsen system, you can ensure a comfortable and enjoyable experience for all.

Hot Water Usage

Hot water usage is another critical factor to consider when sizing your Onsen Hot Water System. Factors such as the number of hot water outlets in your home and the peak demand for hot water should be taken into account. The average Australian uses between 40 to 50L of hot water per day.

By estimating your household’s hot water usage, you can select an Onsen system that will efficiently meet your needs while providing the endless hot water luxury you desire.

Customer Reviews and Testimonials

Now that we have explored the features, benefits, and size of Onsen hot water systems, let’s take a look at what customers have to say about their experiences with these systems. In this section, we will share customer feedback on the performance, reliability, and overall satisfaction of Onsen hot water systems.

Hearing directly from customers who have used Onsen systems can provide valuable insights into the real-world performance and satisfaction levels, helping you make a more informed decision when choosing your hot water system.


Customers have praised the performance of Onsen hot water systems, stating that they deliver endless supply of hot water and are highly efficient. The energy efficiency and continuous supply have made a significant impact on the daily lives of those who have installed these systems.

By choosing an Onsen Hot Water System, you too can experience the exceptional performance and enjoy the luxury of endless hot water in your home.


In terms of reliability, Onsen hot water systems have received positive feedback from customers, who have found them to be dependable and efficient. The anti-frost protection feature, coupled with the system’s durability, ensures that your Onsen system will continue to provide hot water even in the most challenging conditions.

By investing in a reliable Onsen Hot Water System, you can have peace of mind knowing that your home will always supply hot water when needed.

Overall Satisfaction

Customers have expressed high levels of overall satisfaction with their Onsen hot water systems. The combination of endless hot water, energy efficiency, and reliability has made a significant difference in their daily lives, providing a comfortable and enjoyable experience for all members of the household.

By choosing an Onsen Hot Water System, you too can experience the satisfaction of knowing that your home is equipped with a top-notch hot water system that meets all your needs.


We have explored the world of Onsen hot water systems, delving into their key features, benefits, and how they compare to other types of hot water systems. With their endless hot water supply, energy efficiency, and anti-frost protection, Onsen systems provide a luxurious and comfortable experience for everyone in your household.

By considering factors such as household size and hot water usage, you can select the right Onsen Hot Water System for your home, ensuring an enjoyable experience for all. With positive customer feedback on performance, reliability, and overall satisfaction, an Onsen Hot Water System is an investment that will keep your family warm and comfortable for years to come.

Frequently Asked Questions

What is the energy efficiency rating of Onsen Hot Water Systems?

Onsen hot water systems offer excellent energy efficiency, with an impressive 6-star rating. This makes them a great choice for those looking to save on their energy bills.

How do Onsen Hot Water Systems compare to storage tank systems and heat pump systems?

Onsen hot water systems are more energy efficient than storage tank and heat pump systems, and offer an endless supply of hot water. However, each system has its own advantages and disadvantages depending on individual needs and preferences.

What are the installation and maintenance requirements for Onsen systems?

For a proper installation of Onsen systems, it’s recommended to consult a professional.

Additionally, minimal maintenance is needed, with an annual checkup advised for optimal system functioning.

How do I choose the right Onsen system for my household?

Take into account your household size and hot water requirements to determine the Onsen system that is most suitable for your home.

Researching customer reviews can also be beneficial in finding the right Onsen system for your needs.

What is the warranty coverage for Onsen Hot Water Systems?

At Onsen, we understand that your hot water system is a long-term investment and provide you with a generous 7-year warranty to ensure your satisfaction.

This warranty is designed to give you peace of mind and confidence in your purchase. It covers all parts and labor for the duration of the warranty period.