FIELD: instrument engineering.
SUBSTANCE: invention concerns liquid heater (1) that comprises pipe coil (5), electrical heating coils (4) and switch (6) selectively positioned to switch on and switch off the heating coils. Besides, the invention involves safety fuse (7) which while in service is to be heated with the electrical heating coils and designed to be fused at least partially when temperature at least within zone (8) of the electrical heating coils passes a critical threshold and to change switch (6) between on/off position.
EFFECT: invention allows to power off the heater in a certain operation threshold.
9 cl, 4 dwg
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