... cost etc.1. Monobloc water heater heat pump, heating capacity 11000~18000BTU, COP is above 4.2, water tank volume is 150-500L ... , hot water generated is 95-250L per hour, power ... consumption is under 1/4 compared with electric water heater .2. Split water heater heat pump, heating capacity from 13000BTU--180000BTU, COP ...