| Smoke Tube Boiler |
Water Tube Boiler |
| Rate of evaporation is low. |
Rate of evaporation is high. |
| Boiler pressure is low. |
Boiler pressure is high. |
| Less compact. |
Compact in size. |
| Gases flow through the tubes and surrounded by water. |
Water flow through the tubes and surrounded by the smoke. |
| Smoke tube boilers are used where steam demand is low. |
Water tubeboilers are used where steam demand is high. |
| Quality of water is not considered much. |
In this type of boiler the quality of water much maintained and required water treatment. |
| Steam storage capacity is more and this boiler is known as timed boiler. |
Capacity of steam holding is lesser, so its require continous operation. |
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