... operating life. 2,Economical and high effciency. 3, Advanced control 4, Use safely. solar water heater heat pumpYieldhouse supply ... displayer.3. Lower installing fee, only connect duct pipe and water pipe.4. Intelligent defrosting, ensure work well around ... 150L,200L,260L,300L,400L,500LModelYASL1-28HLYASL1-38HLYASL1-38HL Water Tank Volume L 150200260300200300400500100Heating Capacity W /BTU 2800 / ...