The choice between ∆T and ∆P operation of a circulator has, at times, been the subject of rather “heated” debates. It’s almost as if a few Yankee fans are disputing superior pitching or batting performance with a few Red Sox fans. There appears to be some strong opinions involved.

Viega’s Radiant Auto-Balancing System (RABS) gives users the ability to independently control each zone in the system, the company says.

We’re only human, and most humans like to put off things until they absolutely have to be done. 

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. 

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