Hot Water Demand Calculator
Estimate daily hot water demand, peak flow, and heater sizing for residential buildings.
How to Use the Hot Water Demand Calculator
- Enter the number of occupants.
- Enter the number of hot water fixtures.
- Enter required temperature rise in °C.
- Review daily demand and heater power.
Use Cases
- •Water heater sizing
- •Plumbing system design
- •Energy efficiency planning
Formula
Q = m × Cp × ΔT
Frequently Asked Questions
How accurate is this calculator?
Results are based on standard engineering formulas and are suitable for preliminary estimates.
What units are used?
SI units (metres, kg, kPa) are used unless otherwise noted.
Is it free?
Yes, all calculators are completely free.