This Webasto 5KW water heater kit with plate heat exchanger can produce continuous tap temperature water, yes. Flow rate at tap (once mixed with cool water via the domestic storage tank) is approx 5 ltrs per minute. Warm up time from cold is dependent on coolant circuit size overall although Webasto literature states approx 5 mins. Exact flow rates and hot water tap temperatures are also dependent on mixer valve (included in kit) settings. The plate heat exchanger heater coolant side will be approx 80-85 celsius, this will be reduced on the domestic hot water circuit via the mixer valve to a chosen safe temperature. For further related info please review our web links below on typical water circuits and operation modes
https://www.butlertechnik.com/technical-library/thermo-top-c300
