| Inward Flow Reaction Turbine | Outward Flow Reaction turbine |
| 01. Water flows the outer periphery of wheel towards the wheel centre and discharges at the inner periphery. | 01. Water enters the wheel centre (inner periphery) and flows outward and discharges at the outer periphery. |
| 02. The centrifugal head (U₂² – U₁²)/2 imparted to water as it flows through the turbine runner is negative, as U₂ is smaller than U₁ | 02. Water enters the runner with excess pressure and hence both pressure and velocity of water change as water passes through the runner. |
| 03. Due to negative centrifugal head, relative velocity of water at the outlet is reduced. | 03. Due to positive centrifugal head, relative velocity of water at the outlet is increases. |
| 04. Discharge does not increase. | 04. Discharge increases. |
| 05. Less or no tendency of wheel to race if the turbine speed increases, as the turbine itself adjust the speed. | 05. If the turbine speed increases, wheel tends to race as turbine by itself can not adjust the speed. |
| 06. Effective and easy speed control is possible. | 06. Speed control is difficult. |
| 07. Used for large output and suitable for medium and high heads. | 07. Used for low and medium heads. |
| 08. Used often in power plants. | 08. Obsolete. |
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