1 Expansion vessel
2 Pressure relief valve
3 Non return valve
4 Thermostats
5 Safety cut-outs
6 Element plate assemblies
7 Element 'On' neon
8 Inlet
9 Discharge
10 Outlet
11 Cable entr
y
12 Temperature and pressure relief valves
1
2
3
4
5
6
6
7
8
9
12
12
10
11
