In Hong Kong, whether it is a damp, chilly winter or a hot and humid summer, a stable and reliable water heater is an essential appliance for every household. When we talk about high-quality water heater brands, Japan’s “Rinnai” is undoubtedly one of the top choices for many people. With nearly a century of history and specialist expertise in gas appliances, Rinnai water heaters have built an excellent reputation in the market. However, for consumers who are considering replacing or newly installing a water heater, the key question remains: is a Rinnai water heater good to use? What do real users say? This article takes an in-depth look, combining discussions from local Hong Kong forums, media reports, and even references to feedback from Taiwan users, to provide you with a comprehensive and objective 2025 buying guide for Rinnai water heaters.
Rinnai was founded in Japan in 1920, initially starting with the production of gas stoves. After years of development, Rinnai has become a leading global manufacturer of gas water heaters, cooking stoves and clothes dryers. The brand’s core philosophy is “Quality is our destiny”, and it is committed to providing safe, comfortable, environmentally friendly and convenient products. In Hong Kong, Rinnai water heaters are known for their excellent constant-temperature technology, high energy efficiency and durability, making them popular among families who value quality of life.
Are Rinnai Water Heaters Good to Use? A Summary of Online Reviews
To judge whether a product is good or not, the most direct method is to refer to reviews from real users. We collected user feedback from major Hong Kong discussion forums (such as Hong Kong Discuss, LIHKG and Baby Kingdom) as well as well-known Taiwan forums (such as Mobile01 and PTT), and summarised the key points below.
Reviews from Hong Kong Users
In Hong Kong online communities, discussions about Rinnai water heaters are quite active, and reviews are generally positive, especially in the following areas:
Extremely stable outlet water temperature: This is the point most praised by Hong Kong users. Many users say that even in winter, when water pressure is unstable or when several people are using water at the same time, Rinnai’s constant-temperature water heaters can still provide very stable hot water without sudden changes between hot and cold. This is especially important for families with elderly people or children.
Saves towngas/LPG: Many users who switched from older water heaters to Rinnai constant-temperature models report a noticeable drop in gas costs after replacement. This is thanks to Rinnai’s advanced combustion technology, which can precisely adjust the flame according to the required water temperature and avoid waste.
Durable body: “Used it for ten years and it still hasn’t broken down” is a comment often seen on forums. As a Japanese brand, Rinnai’s product durability is widely recognised, and many households can use one unit for a very long time, proving its reliable quality.
Mixed reviews on after-sales service: Although the product quality is good, online reviews of the Hong Kong agent’s after-sales service and installation arrangements are more divided. Some users praise the technicians for being professional and polite, while others mention longer waiting times for repair or installation appointments, or misunderstandings during communication. Therefore, choosing a reliable distributor and installation team is very important.
Reviews from Taiwan Users (Sources Indicated)
Rinnai also has an important position in the Taiwan market. We referred to reviews from Taiwan’s Mobile01 and PTT forums and found that there are many similarities with the experiences of Hong Kong users, as well as some points worth noting:
(Source: Taiwan Mobile01 forum) Appreciation for digital constant-temperature technology: Taiwan users generally give very high ratings to Rinnai’s “digital constant-temperature” technology, saying that it allows the required temperature to be set precisely (for example, 41 degrees), with the computer automatically adjusting it. The user experience is far better than that of traditional mechanical water heaters.
(Source: Taiwan PTT forum) The importance of a water flow servo: The “water flow servo” technology found in some high-end models is widely discussed in Taiwan. Users share that this function ensures both water output and temperature remain consistent when water pressure changes, greatly improving shower comfort.
(Source: Taiwan user sharing) Emphasis on choosing indoor and outdoor models: Taiwan has diverse living environments, and users particularly stress the need to choose suitable forced exhaust (RF) or forced supply and exhaust (FF) models according to the installation environment (indoor, balcony) to ensure absolute safety. This point is equally important for Hong Kong’s compact and densely populated living environment.
Advantages of Rinnai Water Heaters
Combining reviews from various sources and official information, we can summarise the key advantages of Rinnai water heaters as follows:
Top-level constant-temperature technology: Uses multiple patented technologies such as CPU intelligent control, stepless burner control and water flow servo to ensure constant water temperature and say goodbye to showers that suddenly turn hot and cold.
High level of safety protection: Equipped with multiple safety devices, such as flame failure safety device, overheating protection, overpressure protection and flue blockage prevention device, comprehensively protecting home safety. Most models comply with the GU Mark safety certification of the Electrical and Mechanical Services Department in Hong Kong.
High efficiency, energy saving and environmentally friendly: With precise flame control and a high-efficiency heat exchanger, Rinnai water heaters offer very high thermal efficiency, effectively reducing gas consumption and meeting modern households’ needs for environmental protection and cost savings.
Excellent quality and durability: As a brand manufactured or supervised by Japan, Rinnai has strict control over parts selection and production processes. Its products are generally very durable, making them a long-term home investment.
Diverse model choices: Offers models with different water output capacities (from 10 litres to 32 litres), different gas types (towngas and LPG) and different installation methods, meeting a wide range of needs from single-person households to large families.
Disadvantages of Rinnai Water Heaters
Despite the many advantages, Rinnai water heaters also have some potential drawbacks that consumers should note:
Relatively higher price: Compared with some other brands, Rinnai water heaters are generally priced higher in the market. This reflects their brand positioning, technology costs and product quality, so consumers need to balance budget with the quality they are looking for.
Strict installation requirements: To ensure optimal performance and absolute safety, Rinnai water heaters have strict requirements for the installation environment (such as ventilation and flue position). They must be installed by qualified technicians from registered gas contractors, and installation costs may be relatively higher.
Some functions may be too specialised: For users who prefer simple operation, the many fine-tuning functions on some high-end models may seem rather complicated and may not be necessary for everyone.
Recommended Rinnai Water Heater Models in 2025
Based on market demand and user reputation, we have selected three Rinnai water heater models worth focusing on in 2025.
This 10-litre model is very suitable for the small to medium-sized flats commonly found in Hong Kong, especially families with only one bathroom. Despite its compact size, it is fully equipped and also features Rinnai’s core constant-temperature technology. It is sufficient for daily showering and kitchen hot water needs, making it an excellent entry point into Rinnai’s high-quality experience.
Product Type
LPG water heater
Hot Water Flow Rate
10 litres/minute (temperature rise 25°C)
Energy Label
Grade 2 Energy Label
Main Features
Digital constant-temperature technology: Automatically adjusts the flame to ensure stable outlet water temperature and say goodbye to showers that suddenly turn hot and cold.
Motorised exhaust sealed design: Uses forced supply and exhaust (FF), so it does not consume indoor oxygen during combustion, and exhaust gas is fully discharged outdoors for safe and reliable operation.
10-litre water output: Provides 10 litres of hot water per minute (at temperature rise 25°C), meeting the daily kitchen and bathroom needs of a typical household.
Multiple safety protections: Built-in multiple safety devices such as flame failure safety, overheating protection and overpressure protection, providing all-round protection for users.
Slim and stylish body: Simple and compact design that blends easily into modern home décor, especially suitable for flats with limited space.
Suitable Users
Single users, couples or small families living in small to medium-sized flats
The 14-litre water output can more comfortably handle households with one kitchen and one bathroom, or one kitchen and two bathrooms (not used simultaneously). This model achieves an excellent balance between performance and capacity, and is equipped with a more advanced control system. Even during peak water usage, it can keep the water temperature precisely stable, making it the preferred choice for mainstream families seeking the ultimate shower enjoyment.
Product Type
Towngas constant-temperature water heater
Hot Water Flow Rate
14 litres/minute (temperature rise 25°C)
Energy Label
Grade 1 Energy Label
Main Features
Ultra-slim and compact appearance: The Rinnai RJW14SDL water heater features a stylish and minimalist design. With a body thickness of only 75 mm, it is exceptionally slim, effectively saving installation space while enhancing the overall look of the home.
Precise constant-temperature control: Equipped with a digital temperature control system, providing 16 levels of hot water temperature selection between 35°C and 60°C, ensuring stable outlet water temperature and an exceptionally comfortable shower experience.
ECO energy-saving function: A dedicated ECO function reduces water flow with one touch, effectively lowering energy consumption, helping you save on electricity costs while supporting environmental protection.
Efficient hot water supply: Provides a hot water supply of up to 14 litres/minute (25°C temperature rise), enough to meet the instant hot water needs of a typical household without long waiting times.
Easy and safe operation: Uses a fully automatic ignition design for intuitive and convenient operation. The motorised exhaust sealed design ensures safe combustion and provides a worry-free usage environment.
Flexible remote control options: Up to 2 wired remote controllers can be added, making it convenient to install them in both the bathroom and kitchen, so you can easily adjust water temperature anytime and anywhere for greater daily convenience.
Suitable Users
Medium-sized families with children and high requirements for water temperature stability
For village house and detached house users who use central LPG or bottled LPG, the RS15TML provides a powerful and stable hot water supply. Its large 15-litre capacity is enough to handle the needs of multiple water points being used at the same time, while its combustion system optimised for LPG characteristics ensures both safety and efficiency.
Product Type
LPG constant-temperature water heater
Hot Water Flow Rate
15 litres/minute (temperature rise 25°C)
Energy Label
Grade 1 Energy Label
Main Features
Precise constant-temperature control: Equipped with a digital temperature control system, hot water temperature can be adjusted from 35°C to 60°C with 16 levels, ensuring stable and comfortable water temperature.
Adjustable down to 35°C: Especially suitable for summer or users who are sensitive to water temperature, providing a wider range of temperature choices.
Fully automatic ignition: Simple to operate, with no need for manual ignition, making it convenient and quick to use.
Multi-point remote control option: 2 digital electronic remote controllers can be added, making it convenient to install them in both the bathroom and kitchen for easy water temperature control.
Motorised exhaust sealed type (top exhaust): Uses a safe and efficient exhaust design to ensure indoor air quality.
Suitable Users
Residents of village houses, villas or larger flats using LPG
Conclusion: Invest in a Reassuring and Comfortable Shower Experience
Overall, the answer to the question “Are Rinnai water heaters good to use?” is yes. Whether in terms of technology, safety specifications or user reputation, Rinnai water heaters demonstrate the strength of a first-tier brand. Their biggest selling point is the ability to provide extremely stable constant-temperature hot water, which plays an irreplaceable role in improving everyday quality of life. Although the upfront cost is relatively high, considering their outstanding energy-saving performance and very long durability, they are a worthwhile home investment in the long run. When purchasing, the most important thing is to choose the most suitable model according to family size, water usage habits, living environment and gas type, and to make sure you find a reputable seller and qualified technician for installation. This is the only way to fully realise its superior performance and bring long-lasting, reassuring warmth to your family.
Where Can You Buy Rinnai Water Heaters?
You can buy them from the Rinnai official website or authorised distributors, such as BBE. BBE has won the “Online Electrical Appliance Sales Reputation Award” for three consecutive years. The award is organised by “Hong Kong Discuss” and selected through nominations from netizens across Hong Kong and a one-person-one-vote process. This honour shows that, in addition to offering the best prices, BBE is also well liked by customers for its professional sales and after-sales service. BBE guarantees that the electrical appliances it sells are all brand-new, genuine Hong Kong authorised products, and provides original manufacturer warranty and a seven-day replacement service for faulty items. Prices are fair and clearly listed, with no tricks. These commitments and services give customers greater peace of mind when choosing electrical appliances, building a long-term relationship of mutual trust with customers.
About Us
BBE Appliance Professional Consultant
BBE Appliance Professional Consultant has 30 years of home appliance retail and buying advisory experience, serving over 200,000 Hong Kong households with practical tips on cooker hoods, ovens, cooktops, and home appliance selection and maintenance.
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