... CE, CCC, ISO9001 heat pump water heaterfor household sanitary water, space heating, heat recovery system water heater ... stable throttling function.3. High efficiency coaxial coil heat exchanger, low fouling, low maintenance cost.4. ... 7. Warranty: 18 months guarantee for the whole units.8. Intelligent Controller, with LCD touch screen ... Temp.(IN/OUT):15/45oC. heat pump water heater for household