Water-Heater Sizing Guide for Greater Vancouver
Proper sizing is essential for adequate hot water supply. An undersized unit runs out of hot water, while an oversized unit wastes energy.
Tank Water Heater Sizing
Tank sizing is based on the first-hour rating (FHR), which measures how much hot water the tank can supply during the busiest hour. A typical 3-bedroom home needs a 40-50 gallon tank. Larger homes with multiple bathrooms may need 50-75 gallons.
Tankless Water Heater Sizing
Tankless sizing is based on the flow rate (gallons per minute) and the temperature rise needed. Ground water temperature in Greater Vancouver averages 7-10°C, so the heater must raise the temperature by 40-45°C to reach a comfortable shower temperature.
Professional Sizing Assistance
BC Wide can help you determine the appropriate size for your replacement water heater based on your household size, usage patterns, and equipment specifications.
Safety Reminder
If you smell gas, suspect carbon monoxide or believe there is an immediate danger, leave the property and contact emergency services or the appropriate gas emergency authority. Do not remain inside — exit the building immediately and call for help from outside.