How much water does a flow thru humidifier waste?

Flow-thru humidifiers are the best cost effective humidification solution in hard water areas; they do however waste a lot of water. Studies have shown that a flow-thru humidifier running 24/7 will consume almost 100,000L annually, of which 80,000L will end up going down the drain. Recovery solutions are available to reduce the amount wasted to less than 365L annually.