Articles by John Siegenthaler, P.E.

An installer uses a 4-way motorized mixing valve to interface between a conventional gas-fired cast-iron boiler and a low temperature radiant panel system.

A project requires both medium and low temperature radiant floor panels. The installer proposes the following system design. 

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.