Articles by John Siegenthaler, P.E.

An installer is asked to provide a system that supplies two zones of fin-tube baseboard and two zones of floor heating.

Infrared thermography reveals heat transfer in action.

When floor heating and domestic water heating occurred at the same time, I discovered there was no flow through the heat exchanger in the indirect tank.

Learn about closed loop/antifreeze-based systems.

Tales of  ‘inexplicably great performance’ that defy the laws of physics.

The cardinal rule of multiple boiler systems is to only provide flow through a boiler that’s operating.

Putting shapes and numbers together.

At one point in time, this schematic appeared in a manufacturer's installation manual.

A classic boiler metal stands ready for the future.

An installer was asked by a client to use both a ground source heat pump and a boiler as alternative heat sources in a zoned, low-temperature hydronic distribution system.