Water Heater Size Calculator
Determine the right water heater tank size and recovery rate based on occupants, bathrooms, and usage pattern.
How to Use the Water Heater Size Calculator
- Enter the number of occupants.
- Enter the number of bathrooms.
- Select the usage pattern.
- Click Calculate for tank size and recovery rate.
使用场景
- •New home water heater selection.
- •Replacing an undersized water heater.
- •Rental property plumbing specification.
- •Plumbing contractor estimating.
公式
Tank size = occupants × factor + bathrooms × 20 L. Factor: low=30, medium=40, high=55 L/person.
常见问题
What is recovery rate?
Recovery rate is how many litres of hot water the heater can produce per hour after the tank is depleted.
What usage pattern should I choose?
Low: occasional use, 1–2 people. Medium: typical family. High: large family with high demand.
Should I choose a tankless heater?
Tankless heaters are efficient for low-demand use but this calculator sizes tank-type heaters only.