Figure 1 shows a piping layout that was used to retrofit a pellet-fired boiler to an existing 4-zone heating system supplied by an oil-fired boiler.

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 zone is any area of a building for which indoor air temperature is controlled by a single thermostat (or other type of temperature controller). 

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

The climate control systems in most commercial buildings have very little similarities to their residential counterparts.