Start with a peak-use inventory
List the fixtures and equipment that draw hot water and note when they overlap. A restaurant with a large cleanup rush has a different profile from a property with showers running steadily through the morning. Share fixture flow, required temperatures, and hours of operation when asking for a quote.
When stored hot water is useful
A storage heater keeps a reserve ready for short, heavy draws. Compare how long that reserve lasts and how fast the unit reheats it. Include the space needed for the tank and the clearance needed to service it.
When tankless deserves a look
Tankless equipment is sized for flow at a given temperature rise. Larger loads may require multiple units. Confirm gas or electrical capacity, venting, water quality, and how the building would operate during equipment service.
Compare the complete scope
Ask what each proposal includes for removal, connections, routine maintenance, and planned downtime. A commercial system needs to fit the operation, even on its busiest day.
