Unvented System - State Water Heaters SOF 85 220 G Installation Instructions And User Manual

2.1.2.2 Unvented systems
To install an STATE WATER HEATERS water heater on
an unvented cold water supply system a kit of valves and
fittings listed by the water research centre and complying
with part G3 of the current building regulations and BS
7206 should be used. Installation should be carried out
generally as shown on figure 4.
Figure 4 - Typical UK unvented system.
1) Pressure limiting valve
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
14) Hot water supply
15) Expansion valve
16) Expansion vessel
A) Cold water
B) Hot water
C) Return circulation
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