In the heat of summer already begun widespread hot water shutdowns we offer our readers an overview of the Russian market of single-phase instantaneous pressure-type water heaters. As you know, the word 'instantaneous water heater' means a device that heats the water during its flow through the heating element at the period of demand. The main difference of the instantaneous water heaters from storage water heaters is in the absence of a water tank which allows to heat gradually and therefore slower. That's why an instantaneous water heater has to have quite an impressive capacity to succeed in the timely and sufficient warming of the entire water volume passing through it.