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2.1.2.1
Vented systems
If the water heater is to be connected to a cold feed tank
or cistern the hot water supply pipe must include an open
vent which discharges over the cold feed cistern. The
cold feed cistern must have an actual capacity of greater
volume than the hourly recovery rate of the water
heater(s) which it supplies.The minimum actual capacity
is 50 gallons or 227 litres (see figure 3).
Figure 3 - Typcial UK vented system
3)
T&P valve
4)
Stop valve
5)
Non return valve
6)
Circulation pump
7)
Shunt pump
9)
Drain valve
11) Service valve
12) Temperature meter
12
14)
Hot water supply
17)
Three way vent valve
A)
Cold water
B)
Hot water
C)
Return circulation
E)
Overflow
IMD-0047
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