The structure of directly heated hot water boiler is divided into vertical type and horizontal type. One of 10~25Kcal/h is vertical type, the second of 30Kcal/h is two types both vertical type and horizontal type, another of over 30Kcal/h is horizontal type in the structure.

Characteristics for the vertical boiler:
1. Forged-head hearth technology: Increasing radiation area, heat efficiency and lengthen service life
2. Running under atmospheric pressure: Eliminating the possibility of explosion
3. Automatic running, safe and user-friendly operation
4. Quick installation and a small area occupied
5. Fire-tube structure

Characteristics for the horizontal boiler:
1. Three-pass structure
2. Big hearth technology: Increase radiated area, decrease quantity of NOx, reduce machine volume
3. Big flue technology: Reduce the resistance of smoke flowing and waste of electric
4. Intelligent control system: The system can control the operation of more than one boiler, may also carry out remote monitoring
5. Bi-constituent heat preservation coating technology: Using less thickness heat preservation material to realize better effect and energy- conserving
6. Complete pothook type faceplate design: Fine appearance, easy to install, assemble and maintain
7. Adopting bask resistant and transfer-color resistant through dealing with the surface, make the original color for a long time
8. Back water into from the top of the boiler, make an excellent water circulation and a small current resistance
9. Equipping a condenser for gas-fueled boiler. It is an unalloyed product to save fuel and reduce the noise

Application:
1. Providing hot sources for heating through radiators, especially fit to use in resident area, hospital, school, bank and so on. The outlet water temperature is 90 degrees
2. Providing heat source for central air conditioning with water-water heat exchangers for 24 hours
3. The vertical type boiler can supply life hot water or boiling water directly