1. Identify the water source

Tap water, shallow-well water and deeper groundwater can present different sediment, pressure and dissolved-solid conditions. Explain the real source before accepting a recommendation.

2. Ask what the quoted price includes

Confirm delivery area, standard installation, basic testing, warranty documents and whether additional plumbing or electrical work can create extra charges.

3. Check the service path

Ask who performs future maintenance, how replacement parts are obtained and what happens after the included warranty ends.

4. Confirm the exact model

Check the final component configuration, storage specification, electrical requirements and installation dimensions against the product you will actually receive.

5. Compare the total payment

A low deposit can have a higher final total. Compare the full-payment offer with the complete scheduled-payment total before deciding.