An engineer is planning underground insulated piping for a small district heating system, which receives heat from a central boiler plant and distributes it to three separate buildings. He is planning what he calls a “primary/secondary” piping system.
An installer is asked to use a pellet-fired boiler to supply heat to two zones of low-temperature radiant floor panels. The system includes a three-way motorized mixing valve to reduce the supply water temperature to the distribution circuits.
Check out Plumbing & Mechanical's September 2017 issue, featuring our cover story on PHCC CONNECT 2017. Other features include the benefits of heat pump water heaters, preventing cockroach infestations with drain maintenance, and much more.