The STIEBEL ELTRON Mini™ tankless water heaters are designed for installation at the point-of-use. The Mini™ heats water instantaneously as it flows through the unit. Stand-by heat-losses are completely eliminated. The efficient heating elements are controlled by a flow switch. Additionally, all Mini™ water heaters are equipped with a safety high-limit with manual reset. The combination of meticulous German engineering and the best available materials ensure that every Mini™ is of the highest quality and designed for many years of trouble-free service. Nobody can compare with our exceptional reliability record and customer support services ! The Mini™ model ship with a 0.5 GPM pressure compensating flow reducer/ aerator that fits most faucets. Flow controls and faucet aerators are highly recommended in conjunction with tankless water heaters. No pressure relief valve*, drains, or circulating pumps needed. *Except in Massachusetts POWER 4 KW FREE SHIPPING IN CANADA