Primary-Secondary vs. Primary-Variable hydronic boiler pumping systems each have advantages for the engineer to consider. Most people in the industry are in one camp or... READ MORE
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An engineer asked a question about using a variable speed pump for air temperature control in lieu of a two-way control valve. What are the... READ MORE
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An engineer asked a question about using variable speed pumps for air temperature control in lieu of a two-way control valve. The question clearly makes you... READ MORE
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Every year we get questions about the importance of primary-secondary piping rules around boilers and coils. Recently, I also received a call about using a... READ MORE
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Correction to my 8-26-19 blog. In the rush to get on vacation I messed up on my math. This is corrected. Thank you to Tom... READ MORE
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Primary-Secondary hydronic piping is a common piping scheme in today’s hydronic heating and cooling systems. This article will show you how to use this common... READ MORE
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Primary-Secondary (P-S) hydronic piping is a common piping scheme in today’s hydronic heating and cooling systems. This short series of blogs will provide examples of piping schemes which will support the reduction of hot water return temperatures to enhance the value of condensing boilers. The first article will just review the rules of the road in P-S piping. ... READ MORE
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