... efficiency and economical Super quality air source heat pump water heater:Yieldhouse(China)-As a professional new energy-saving products ... , lower voice, lower maintenance cost etc.1. Monobloc water heater heat pump, heating capacity 11000~18000BTU, COP is above 4 ... consumption is under 1/4 compared with electric water heater .2. Split water heater heat pump, heating capacity from 13000BTU--180000BTU, ...