Articles by John Siegenthaler, P.E.

The concept for a simple, stable and efficient residential heat source.

As the price of fuel oil skyrockets, there is increasing interest in geothermal heat pumps as a heat source for hydronic radiant floor heating.

John Siegenthaler says, if there's ever been a time to get serious about slab insulation, it's now!

Some choose to jump into designing or installing solar thermal systems with no additional training.

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.