The measure of a heat pump’s heating performance is called coefficient of performance (COP). It’s the ratio of useful heat output divided by required energy input, where both the output and input are expressed in the same physical units.

By now, most of you have either installed inverter-driven variable speed heat pumps that can deliver their nominal rating output at temperatures well below 0° F without any backup heat source, or at least have become familiar with the technology. 

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

As global energy planning moves away from fossil fuels and toward electricity, an increasing number of hydronic heating systems are being supplied by heat pumps. 

Each year, Plumbing & Mechanical editors receive thousands of product releases from industry manufacturers. 

Heat pumps are incredibly useful devices. 

The dawning of a new year has PHVAC industry experts cautiously optimistic about new opportunities that lie ahead in 2021. 

Hydronic heating professionals often promote the concept that current generation mod/con boilers can operate with AFUEs in the range of 95% and above. 

Whenever a hydronic system is divided into several zones, it’s worth considering a buffer tank between the heat source and distribution system.