... center CE,TUV,EMC,ISO, green ,energy-saving,economical Air to water heat pump --for hot water or heatingModel:DE-92W/DDetails:1 ... noise,low power consumption4.Deron high efficiency Tube in tube heat exchangers,low fouling and easy for maitance5. Anti-corrosion: Coated steel ... or SUS304# stainless steel case6.Long service life up to 15 years.7. General testing and operational test carried our ...