Start with the observed change
Explain whether hot water is unavailable, the supply has become less reliable, water is appearing near the equipment or your needs have changed. Note whether the issue affects every outlet or only one and whether it occurs at a particular time. Do not choose a replacement solely because a symptom sounds familiar.
Provide the model and any installation or previous repair record you have. State the energy source and whether the unit stores hot water or heats it without a storage tank. These descriptions help keep the enquiry tied to the actual equipment.
Ask what each option would achieve
A repair proposal should identify the issue it is intended to address. A replacement proposal should explain the equipment and installation scope. Ask which findings support each option and whether further assessment is needed before comparing them.
If hot-water demand has changed, explain the new uses separately from any equipment fault. For commercial use, describe the operation and the periods of greatest demand instead of assuming that a household example applies.
Compare scope and documentation
Ask what is included for equipment, connections, removal, access and any work by another trade. Clarify the proposed timing and the manufacturer documents, service record or warranty information to retain.
You do not need to settle on a tank, tankless system, gas or electric option before describing the need. The general water-heater page remains the service overview; this guide helps structure a decision without promising that either repair or replacement is always the better choice.