
100 Wiring fixed appliances
that it saves the cost of extra piping and feed tanks required for other types. It
is essential that this type is fixed above the highest draw-off point. It will feed
any number of taps but, in order to secure efficient results, the lengths of
piping feeding the taps should be kept as short as possible.
Two-in-one heaters In the dual or under-drain-board heater, advantage is
taken of the fact that the full capacity of the heater is frequently not required
continuously. In one particular type two heating elements, each
3
kW loading
and with its own thermostat, are fitted — one near the top to keep about 30
litres