What the system does
A heat-pump water heater transfers heat from air into stored water. Its location therefore affects the assessment: the air path, room conditions, sound and condensate route belong in the scope alongside the electrical supply and storage capacity.
Bring the right information
Record the project address, present model and fuel, hot-water use, the location of affected fixtures and accessible photographs. Explain whether the goal is replacement, greater capacity, reduced waiting time, a fuel change or a wider renovation. Those goals can lead to different designs.
What the proposal should resolve
Ask how the intended operating mode meets peak demand, what happens during heavier use, where condensate goes and how service access remains clear. Use the exact model instructions rather than a universal room-size rule.
Compare the complete commitment
Keep the equipment model and performance evidence with the installed price. Include associated trade work, removal, permits where required, commissioning and warranty responsibilities. Treat future operating costs as a separate calculation with explicit consumption, rates and currency.
A product category is a useful starting point. Final suitability and availability require the actual model, property assessment and a written proposal.