... efficiency and economical Super quality air source heat pump water heater:Yieldhouse(China)-As a professional new energy-saving ... performance, lower voice, lower maintenance cost etc.1. Monobloc water heater heat pump, heating capacity 11000~18000BTU, COP is above ... from 13000BTU--180000BTU, COP is above 4.8, water flow volume 2--16cubic meter per hour, has cooling capacity from 7800--123000BUT, ...