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Wondering if some folks in the northern climates can comment on which method you prefer for hot water preheat coil freeze protection. Thx.

Since the keyword search function is down, I couldn't find out if this is a repeat question, so I apologize if it is. My question: Are there any references, websites, energy modeling studies that you can point me to where an analysis of whether condensing boilers with low temp heat recovery...

Editorial Comment First: This is an awesome forum that I wish I came across long before today, and I'm looking forward to reading and contributing. Questions: What is/are some of the more reliable and trouble free control sequence(s)and system piping configuration for automatically switching...