October 2013
Intermediate to advanced
192 pages
8h 30m
English
Content preview from Electric Wiring, 3rd Edition
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Water heaters 103
Table 6.3. Immersion-heater loadings recommended for average requirements
Automatic temperature control
Hand control
(litres)
70
90-110
110-135
135-220
(kW)
1
2
3
4
[litres)
70
90-110
135-180
180-270
(kW)
2
3
4
6
resistance to corrosion and scaling. In cases of this nature the manufacturers
should be consulted.
Immersion heaters should normally include, or be controlled by,
thermostats; otherwise boiling may occur if the user forgets to switch off.
These heaters may be connected on the normal or off-peak supply (if
available) depending on the requirements. It is often useful to control an
immersion heater by a timeswitch s ...
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