| 摘要 |
A heater for heating a liquid including a housing defining a closed elongate heating chamber therein with a cylindrical chamber surface, a rotor body rotatably journalled in the heating chamber with a cylindrical peripheral surface thereon concentrically of the chamber surface so as to define an annular space between the chamber surface and the peripheral surface on the rotor body, drive means for effecting relative rotation between the rotor body and the housing, and pump means for circulating the liquid through the annular space so that the rotation of the rotor body heats the liquid passing through the annular space.
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