Quick take
Tankless RO is worth it when compact design, high on-demand flow and smart features matter. Traditional tank systems remain better for repairability and standardized parts.
Why buyers pay more
Tankless systems use larger membranes and powered pumps to make purified water on demand. This supports faster faucet flow and smaller under-sink footprints.
The ownership tradeoff
Proprietary cartridges, pumps and electronics can raise long-term cost and reduce repairability compared with standard tank systems.
Wastewater claims
Headline pure-to-drain ratios should be interpreted alongside automatic flushing and real household operation.