Learning Center
Tank vs Tankless Reverse Osmosis
A tank RO system makes purified water slowly and stores it in a small pressure tank under the sink. A tankless RO system makes water on demand as you pour, so there is no storage tank. Both deliver RO-quality drinking water; the differences are space, flow, upkeep and price.
The systems we install
| Tank RO | HW800 AlkaPro tankless RO | |
|---|---|---|
| Stages | 5 | 7, including alkaline remineralization |
| Production | Stored in tank, poured on demand | 800 gallons per day, made on demand |
| Cabinet space | Storage tank under the sink | No storage tank |
| Filter changes | Changed by our team ($199 annual service) | Owner-replaceable quick-connect cartridges |
| Monitoring | Not included | Faucet-mounted monitor |
| RO-only installed price | $650 | $850 |
Spec sheets: tank RO and tankless RO.
How to choose
- Choose tank RO if you want the lower price and prefer that we handle filter changes.
- Choose tankless RO if cabinet space matters, you want fast fill for pitchers and pots, you like the alkaline stage, or you would rather swap cartridges yourself without a service call.
Compare it for yourself.
Most El Paso city-water homes can be quoted without an in-home appointment.