Variable-speed hydronic circulation has been around for years. With the advent of packaged controls on pumps, it is easier than ever to implement. To take a closer look at the concept of variable-speed pumping, I asked professional engineer and manager of application engineering for Taco Inc. Greg Cunniff and Warwick, R.I.-based plumbing and heating specialist William J. Riley to explain the best applications and key benefits of the technology. Convection-Heat-Transfer Equation The speed ...

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