The boilers can supply multiple heating loads with compatible supply temperature requirements.
Always ensure that loads sensitive to high temperatures are protected using means such as mixing
valves.
Check valve (typical of each boiler - may be integral to pump).
Tridicator (shipped with boiler) typical of each boiler.
Pressure relief valve (shipped with boiler) typical of each boiler.
Boiler pump into rear connection (typical of each boiler).
Low-loss header / hydraulic separator (shown) or closely-spaced tees 'bridge' to load piping.
Figure 33 Multiple boiler piping