Articles by John Siegenthaler, P.E.

An installer decides to use a four-way motorized mixing valve to interface between a gas-fired, cast-iron boiler and a low-temperature radiant panel system.

Most of you reading this column consider yourselves heating professionals.

This installation greeted my friend Harvey Youker, who got the SOS (Save Our System) call from a frustrated homeowner.

I recently read an Internet posting asserting that heat pumps, both air-source and geothermal, should not be considered renewable energy heat sources.

An installer assembles a small hydronic heating system for a well-insulated home.

A new piping concept and control wiring challenge.  

 A hydronic system is to be designed to supply four panel radiators, each with its own thermostatic radiator valve, and an indirect water heater from a gas-fired sectional cast-iron boiler.

A new way to protect a heating system.

An installer is asked to build a system to supply both radiant floor heating and a “hydro-air” zone. All heat will be supplied from a gas-fired cast-iron boiler.

You’re probably oversizing expansion tanks in low-temperature systems.