Hot Water Demand Calculator
Static · formula-only · worked example computed when this page was built · no live data
The Hot Water Demand Calculator finds daily hot-water demand, peak-hour load, and storage tank size for a building. Example: for 50 office workers plus 100 restaurant meals per day, Daily demand = 1650 L/day, Storage tank = 750 L, Heat energy = 61.3 kWh (per ASHRAE HVAC Applications Handbook Ch.50).
How it works
Computed from your inputs per ASHRAE HVAC Applications Handbook Ch.50. Anything the worked example does not state uses this calculator's standard default; the interactive version shows every input and lets you change it.
Worked example (Plumbing & Pumps)
Inputs: 50 office workers plus 100 restaurant meals per day.
| Result | Value |
|---|---|
| Daily demand | 1650 L/day |
| Storage tank | 750 L |
| Heat energy | 61.3 kWh |
Computed by WorkHive's calculation engine when this page was built; standard: ASHRAE HVAC Applications Handbook Ch.50.
How to use this calculator
- Read the worked example. It uses 50 office workers plus 100 restaurant meals per day and shows every number in the method.
- Follow the formula with your own figures: it returns Daily demand, Storage tank, Heat energy, computed per ASHRAE HVAC Applications Handbook Ch.50.
- To compute interactively, open the Hot Water Demand Calculator inside WorkHive's free Engineering Design suite (link below). It runs the same method with your inputs.
FAQ
What is a hot water demand and storage calculator?
The Hot Water Demand Calculator is a free online tool that finds daily hot-water demand, peak-hour load, and storage tank size for a building. It shows the formula and a fully worked example so you can check the method, not just the number.
How is it calculated?
The result is computed from your inputs following ASHRAE HVAC Applications Handbook Ch.50. The worked example on this page shows a real computation with real numbers.
Is the calculator free?
Yes. WorkHive is free: this worked example is open to everyone, and the interactive calculator runs inside the free Engineering Design suite after a free sign-up (your work is saved to your account). WorkHive is a free, offline-first maintenance platform built for Philippine industrial plants.
Run it on your own numbers
Open the interactive Hot Water Demand Calculator in WorkHive. Free, and a free sign-up saves your calculations, BOMs and scope-of-works to your account.