Although the market for gas-fired boilers continues to track toward those that can modulate and operate with sustained flue gas condensation, conventional boilers (e.g., those not designed to operate with sustained flue gas condensation) still represent a significant portion of the market. 

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. 

Heat pumps are incredibly useful devices. 

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. 

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). 

Most buffer tanks used in hydronic systems are piped in a “4-pipe” configuration.

The versatility of modern hydronics technology allows designers to create systems that are “customized” to the needs — and constraints — of almost any building. 

Some hydronic system designers cling to certain system piping configurations — even when existing projects using those configurations have produced problems.

Anyone who says they wouldn’t change a thing on the hydronic systems they’ve designed or installed over the last decade is either so oblivious to changes in technology that they don’t know any better, so egotistical they can’t accept that improvement of their work is possible, or so foolish they don’t care what they’re missing out on.