| 摘要 |
FIELD: heating industrial enterprises and farms, municipal and private houses, hothouses, etc. SUBSTANCE: electric heater has insulating housing, control pulse unit and coil placed inside and wound on rod; coil has two parts with their diameter ratio of 1:2. In particular cases, ratio of inner diameter of housing to height of coil wound on rod amounts to at least 1:3 and rod is of rectangular section. EFFECT: improved reliability, reduced sluggishness and power requirement, facilitated manufacture. 3 cl, 1 dwg
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