... type CE, CCC, ISO9001 heat pump water heaterfor household sanitary water, space heating, heat recovery system water heater applications etc. 1. Hitachi, ... and stable throttling function.3. High efficiency coaxial coil heat exchanger, low fouling, low maintenance cost.4. Durable coating ... damage to the coating, avoiding rust for long time.5. Accurate casing for the fan shroud, with strictly equal ...