Articles by John Siegenthaler, P.E.

Another European concept that will eventually show up in North America.

Can you identify at least four errors in this design?

Will low head loss boilers make a come back?

Given all the recent interest in solar domestic water heating, Joe Wrenchturner decides to have a go at it.

Exploring microbubble air separation in hydronic systems.

Hardware consolidation will hasten adoption of active solar energy systems.

Get ready for circulators with different personalities.

Trimming away extraneous design details and hardware for the most efficient hydronic heating systems.

A heating contractor, who’s tired of coaxing 500-pound cast-iron boilers into homes, decides to try out a wall-mounted mod/con boiler because of its light weight and side wall venting.

It’s not the professional way to select a circulator.