Articles by John Siegenthaler, P.E.

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.

A schematic appeared in a manufacturer’s installation manual. It was their recommended way to install a two-zone system using zone valves.

It doesn’t have to be perfect to be effective.

Some recent discoveries about ducting.

Air-to-water heat pumps offer new opportunities for hydronic pros.

Eager to keep up with this new technology, an installer decides to install a hydraulic separator between a boiler and distribution system.

Updating an old approach using modern hardware.

The system shown was installed to provide domestic hot water to a high-end home with six bathrooms. The installer selected the largest 119-gallon indirect water heater available from his local supplier.