How to Choose the Right Size of a Tankless Water Heater?
As a homeowner in Canada, one of the most important decisions you will make is choosing the right size tankless water heater for your home. Tankless water heaters are becoming increasingly popular due to their energy efficiency and convenience, but choosing the wrong size can lead to a number of issues, including inadequate hot water supply and higher energy bills. In this guide, I will provide you with all the information you need to choose the right size tankless water heater for your Canadian home.
Introduction to Tankless Water Heaters
Tankless water heaters, also known as on-demand water heaters, are an energy-efficient alternative to traditional tank water heaters. Unlike tank water heaters that store and heat large amounts of water, tankless water heaters heat water only when it is needed. This means they use less energy, take up less space, and provide an endless supply of hot water.
One of the key benefits of tankless water heaters is their longevity. While traditional tank water heaters typically last 10-15 years, tankless water heaters can last up to 20 years with proper maintenance. Additionally, tankless water heaters have lower operating costs since they only heat water as needed, reducing energy waste and lowering utility bills.
Understanding the Importance of Choosing the Right Size Tankless Water Heater
Choosing the right size tankless water heater is crucial to ensuring that your home has a reliable supply of hot water. A tankless water heater that is too small for your home will not be able to keep up with your hot water demands, leading to cold showers and frustrating experiences. On the other hand, a tankless water heater that is too large for your home will result in unnecessary energy waste and higher utility bills.
Another factor to consider is the climate in which you live. In colder climates, the incoming water temperature is lower, which means that a larger tankless water heater may be necessary to meet your hot water needs. Additionally, the number of people living in your home and the frequency of hot water usage should also be considered when selecting the right size tankless water heater.
Factors to Consider When Choosing the Right Size Tankless Water Heater
There are several factors to consider when choosing the right size tankless water heater for your Canadian home. These include:
Flow Rate
The flow rate is the rate at which water flows through the tankless water heater. It is measured in gallons per minute (GPM). To determine the flow rate needed for your home, you will need to consider the number of fixtures and appliances that require hot water simultaneously.
For example, a shower typically uses 2.5 GPM, while a washing machine uses 2 GPM. If you have two people taking showers simultaneously while the washing machine is running, you will need a tankless water heater with a flow rate of at least 7 GPM.
Temperature Rise
Temperature rise refers to the difference between the temperature of the incoming water and the desired output temperature. In Canada, the incoming water temperature can be as low as 5°C in the winter months. To determine the temperature rise needed for your home, subtract the incoming water temperature from the desired output temperature.
For example, if your desired output temperature is 120°F and the incoming water temperature is 40°F, the temperature rise is 80°F. This means that you will need a tankless water heater that can provide a temperature rise of at least 80°F at the desired flow rate.
Energy Efficiency
Energy efficiency is an important factor to consider when choosing a tankless water heater. Look for models with a high energy factor (EF) rating, which indicates the unit’s energy efficiency. The higher the EF rating, the more energy-efficient the unit is.
Installation Requirements
Tankless water heaters require a dedicated gas line and proper ventilation to ensure safe and efficient operation. Make sure to consult with a licensed professional to ensure that your home meets the installation requirements for the tankless water heater you choose.
How to Calculate the Right Size Tankless Water Heater for Your Home
To calculate the right size tankless water heater for your home, you will need to determine the required flow rate and temperature rise. The formula for calculating the required flow rate is:
Required Flow Rate = Total Fixture Flow Rate x Demand
Total Fixture Flow Rate is the sum of the flow rates of all the fixtures and appliances that require hot water simultaneously. Demand is the number of hot water devices that will be used simultaneously.
For example, if you have two showers and a washing machine that require hot water simultaneously, the total fixture flow rate would be 7.5 GPM (2.5 GPM + 2.5 GPM + 2 GPM). If the demand is two, the required flow rate would be 15 GPM (7.5 GPM x 2).
To calculate the required temperature rise, subtract the incoming water temperature from the desired output temperature.
For example, if your desired output temperature is 120°F and the incoming water temperature is 40°F, the temperature rise is 80°F.
Once you have determined the required flow rate and temperature rise, you can use a tankless water heater sizing calculator to determine the right size tankless water heater for your home.
Using a Tankless Water Heater Sizing Calculator
A tankless water heater sizing calculator is a tool that can help you determine the right size tankless water heater for your home. These calculators take into account the flow rate, temperature rise, and other factors to recommend the appropriate tankless water heater size for your home.
To use a tankless water heater sizing calculator, input the required flow rate and temperature rise for your home. The calculator will then recommend a tankless water heater size based on your input.
Common Mistakes to Avoid When Choosing the Size of Your Tankless Water Heater
There are several common mistakes to avoid when choosing the size of your tankless water heater. These include:
Choosing a Tankless Water Heater Based Only on Price
While price is certainly an important factor to consider, it should not be the only factor. Choosing a tankless water heater based solely on price can lead to purchasing a unit that is too small for your home, resulting in an inadequate hot water supply and frustration.
Not Considering the Climate in Your Area
As mentioned earlier, colder climates require larger tankless water heaters to meet hot water demands. Failing to consider the climate in your area can result in choosing a tankless water heater that is too small for your home.
Not Consulting with a Licensed Professional
Installing a tankless water heater requires expertise and knowledge. Failing to consult with a licensed professional can lead to improper installation, which can be dangerous and result in higher energy costs.
Benefits of Choosing the Right Size Tankless Water Heater
Choosing the right size tankless water heater for your Canadian home has several benefits, including:
Adequate Hot Water Supply
Choosing the right size tankless water heater ensures that your home has a reliable supply of hot water, even during peak usage times.
Energy Efficiency
A properly sized tankless water heater reduces energy waste, resulting in lower utility bills.
Extended Lifespan
A tankless water heater that is properly sized for your home will last longer, reducing the need for frequent replacements.
Tankless Water Heater Size Options
Tankless water heaters come in a variety of sizes, ranging from small units that can be installed under a sink to larger units that can provide hot water for an entire household. The size of the tankless water heater you choose will depend on your hot water demands and the size of your home.
Brands to Consider for Tankless Water Heaters
There are several brands to consider when choosing a tankless water heater for your Canadian home. These include:
Rinnai
Rinnai is a leading brand in the tankless water heater industry, offering a range of energy-efficient and reliable models.
Navien
Navien is another popular brand that offers high-quality and energy-efficient tankless water heaters.
Rheem
Rheem offers a range of tankless water heaters that are both energy-efficient and cost-effective.
Conclusion and Final Thoughts
Choosing the right size tankless water heater is essential for ensuring that your Canadian home has a reliable supply of hot water. By considering factors such as flow rate, temperature rise, and energy efficiency, you can select a tankless water heater that meets your hot water demands and fits your budget. Remember to consult with a licensed professional and avoid common mistakes to ensure safe and efficient installation. With the right size tankless water heater, you can enjoy an endless supply of hot water while reducing energy waste and lowering utility bills.
