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.  

Back in the old days when most folks burned coal, vacuum was just about everyone’s friend. 

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. 

If you have a steam boiler you’re also going to have a pressuretrol.

Sherlock Holmes has always been one of my favorite fictional characters. I envied how he would notice each detail and use every one of his senses to solve the crime.