Express Water Model 6 ROT600 600 GPD Tankless RO System
Six times the production of the tank systems, at a third of their faucet flow rate.
$395
Usability
The Model 6 is Express Water's answer to the tankless category and it is the right choice for anyone who found the tank systems slow or could not spare the cabinet space. Six hundred GPD and a 2:1 drain ratio are both genuine improvements over the 50-100 GPD and 3:1 worst case of the tank platform, and losing the pressure vessel frees most of a cupboard. The catch is faucet flow: 0.42 GPM against 0.8 GPM from a pressurised tank, so filling a pot is slower even though the system produces far more water per day. It also needs mains power, which many under-sink cabinets lack, and Express Water publishes a total purified volume of 1,056 gallons without a corresponding time interval, so there is no service schedule to plan around. No NSF listing applies to this model.
- 600 GPD production, six times the tank systems
- 2:1 pure-to-drain ratio, better than the 1:1 to 3:1 range on the tank platform
- No pressure vessel, so it frees most of the under-sink cabinet
- Filter-change alert built into the unit
- Wide 30-100 PSI operating range, more tolerant than the tank systems
- Faucet flow is 0.42 GPM, roughly half what a pressurised tank delivers
- Requires a mains outlet under the sink
- No NSF listing
- Filter life published as 1,056 gallons total with no time interval, so no service schedule
- One-year warranty
- Pump means it is not silent, unlike the tank systems
The Model 6 is Express Water's tankless reverse osmosis system, using a pump to drive a 600 GPD membrane on demand rather than storing water in a pressurised tank. Five filtration stages, a 2:1 pure-to-drain ratio, a 0.42 GPM faucet and a filter-change alert on the unit. It measures 15.8 in high by 18 in long by 6.1 in deep and weighs 26 lbs, and it needs a mains outlet.
Additional information
Specification: Express Water Model 6 ROT600 600 GPD Tankless RO System
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