The second of five eBooks for the hydronics market is here! Brought to you by Plumbing & Mechanical, PM Engineer and Supply House Times, this eBook is a collection of columns and articles from John Siegenthaler, P.E., a well-respected hydronics expert and longtime columnist for PM, pme and Supply House Times.

The measure of a heat pump’s heating performance is called coefficient of performance or COP. It’s the ratio of useful heat output, divided by required energy input, where both the output and input are expressed in the same physical units.

The second of five eBooks for the hydronics market is here! Brought to you by Plumbing & Mechanical, PM Engineer and Supply House Times, this eBook is a collection of columns and articles from John Siegenthaler, P.E., a well-respected hydronics expert and longtime columnist for PM, pme and Supply House Times.

Avoid lightweight concrete for heated slabs.

An efficient hydronic system is more than just a high-performance boiler.

We are proud to present the first of five eBooks specifically for the hydronics market. Brought to you by Plumbing & Mechanical, PM Engineer and Supply House Times, this eBook is a collection of columns and articles from John Siegenthaler, P.E., a well-respected hydronics expert and longtime columnist for PM, pme and Supply House Times.

Einstein’s definition of insanity was doing the same thing over and over and expecting different results.

Wet-rotor circulator technology got to where it is today through continuous design and manufacturing improvement.

All boilers that aren’t designed to operate with sustained flue-gas condensation should be protected against sustained flue-gas condensation.