Modeled totals by household size
Operating costs scale with indoor water use (gpcd × people). Pick a household size to see entry and mid‑tier ion‑exchange totals across hardness bands.
Entry-system 5-year totals by household size and hardness
| Household | Soft | Moderately hard | Hard | Very hard |
|---|---|---|---|---|
| 2-person | $1,386 | $1,457 | $1,528 | $1,671 |
| 3-person | $1,457 | $1,564 | $1,671 | $1,885 |
| 4-person | $1,528 | $1,671 | $1,813 | $2,098 |
| 5-person | $1,600 | $1,778 | $1,956 | $2,312 |
See also: by hardness band · by system type · calculator