6 Key Factors to Consider When Choosing a Gas Water Heater

In our daily lives, we use water heaters almost every day, making it crucial to choose a safe and reliable model. Here are six factors to consider when purchasing a gas water heater.

Key highlights of this article: 

• Hot Water Flow Rate
• Thermal Efficiency
• Suitability for Installation 
• "GU" Mark
• Size
• Installation Restriction

1. Hot Water Flow Rate

The hot water flow rate indicates the output speed of hot water and is a key performance metric for gas water heaters. It is usually measured in liters per minute at a temperature rise of 25°C. For example, if the incoming water temperature is 15°C in winter, a gas water heater that can raise the temperature by 25°C will provide hot water at 40°C. If you need the water heater to supply hot water to both the bathroom and kitchen simultaneously or if you prefer to fill a bathtub quickly, choose a model with a higher hot water flow rate.

2. Thermal Efficiency

The energy label displays the energy efficiency rating, with Grade 1 being the highest (green) and Grade 5 the lowest (red). The second line on the label indicates the thermal efficiency at full and half load. The higher the values, the more efficient the heater. According to a 2022 Consumer Council article, there can be up to a 6% difference in thermal efficiency between models. Consider the thermal efficiency when purchasing to save energy and reduce costs.

3. Suitability for Installation

Different gas water heaters have various designs, and you need to consider the installation environment and building design. The sizes of the wall openings for exhaust ducts can vary. Before purchasing, check with the retailer to ensure the chosen model is suitable for your building.

4. "GU" Mark

All residential gas water heaters supplied or sold in Hong Kong must be approved by the Gas Safety Regulator of the Electrical and Mechanical Services Department and carry the "GU" mark. This helps consumers identify and choose qualified products.

5. Size

The size of the gas water heater affects installation. Pay attention to the design of the gas supply pipe, cold and hot water pipes, and the exhaust duct to ensure the heater fits the available space.

6. Installation Restrictions

Regulations require that water heaters be installed according to specific requirements for location, ventilation, gas supply, electricity supply, water supply, drainage, and pressure relief. Some older buildings may not have pre-drilled wall openings, making installation difficult. Therefore, gas water heaters may not be suitable for every apartment.

In summary, when choosing a gas water heater, consider factors such as whether the building has a gas connection, the adequacy of water pressure, shower duration, available installation space, and budget.

After reading this Moorgenzine article, you should have a better understanding of how to choose a gas water heater. If you have any questions, feel free to contact Moorgen. Additionally, if you want to experience the benefits of smart home technology firsthand, visit Moorgen's showroom in North Point, Hong Kong, and discover the true smart home experience.