What is the recommended size in gallons for a water tank serving a 2-storey residence with 7 occupants?

The recommended size for a water tank serving a 2-storey residence with 7 occupants typically involves considering the daily water usage of the household, which can vary based on factors like the number of bathrooms, the presence of a washing machine, dishes, and other water-dependent activities.

For a household of this size, it is estimated that each person uses around 50 to 100 gallons of water per day. This calculation leads to a total daily water requirement of approximately 350 to 700 gallons for 7 occupants. However, to balance effective water supply and storage without being excessively large, a tank size that accommodates typical usage patterns while ensuring a buffer for peak times or additional needs is ideal.

Choosing 450 gallons as the water tank size serves to meet the daily requirements comfortably; it provides enough water to manage regular household activities while allowing for extra capacity to account for atypical days when water usage might spike. This makes it a suitable and practical recommendation for a residence of this size and number of occupants.

The other options either under or overestimate the water needs, which could lead to potential inconveniences or inefficiencies in water management.