Characteristics: 1. Three-pass and wet back structure, a decent shape of rounded upper part and quare lower part. 2. Big hearth technology: increase radiated area, decrease emission of NOx.3. Big flue gas tube: reduce the resistance of smoke flowing and consumption of electricity. 4. Intelligent control system: automatic running, multi-boiler controlling and remote monitoring is available. 5. Fiberglass heat preservation: less heat loss and low surface temperature. 6. Complete pothook type faceplate design: fine appearance, easy to install, assemble and maintain. 7. Surface treatment with anti-bask and transfer-color resistant powder, keep the original color for a long time. 8. Return water enter into from the top of the boiler, make an excellent water circulation and a small current resistance. 9. A condenser is optional for gas-fired boiler. It is possible to save 12% fuel and decrease noise 20~30dB. 10. Applicable fuels: gas,oil,dual fuel.Applications: 1. Mainly providing heating through radiators, especially fit for use in residential areas, hospitals, schools, banks and so on. The outlet water temperature is 90 degrees. 2. Providing heating for central air conditioning system with water-water heat exchangers. producing area:China supplying capacity:30 sets/month