Figure 1 shows the piping layout for an actual installation. It uses two boilers, fired in stages, to supply three areas of a building. 

An installer recently read about the benefits of piping a buffer tank in a “2-pipe” configuration.  

A heating designer is asked to create a three zone radiant floor heating system using a 5-ton (60,000 Btu/h) geothermal heat pump as the primary heat source, and a mod/con boiler as the auxiliary heat source. 

An installer is asked to pipe up two larger commercial air handlers supplied by a dual boiler setup. 

An installer plans to use a single-speed monobloc air-to-water heat pump to supply several panel radiators. 

A multiple boiler system is set up as shown in Figure 1. The objective is to add heat to the system in three on/off stages. 

A client asks a heating contractor to set up a floor heating system for a new 7,500 square foot machine shop.

An installer pipes up the system shown in Figure 1. Its purpose is to provide two zones of space heating.  

I recently had an inquiry from a designer who needed to combine some high temperature loads with low temperature loads. 

An installer is trying to wire up a two-stage heat pump for heating and cooling operation.