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I have a B&G Monoflo hydronic heating system in my house that was installed in the early 1950s. I have cast iron radiators throughout the house. There are two circuits, but only one thermostat, so the system isn't zoned. I plan to install a Weil-Mclain CGa-6 boiler. The installation manual suggests using system bypass piping in order to provide minimum 130°F return water to the boiler. The diagram that seems like it would best suit my system is this: enter image description here

However, the manual states, “Figure 17 however, is not suitable for radiant heating applications because it does not protect the radiant system from possible high water temperature.”

I have two questions:

  1. How would I create a system bypass for my particular system? A diagram or photo example would be helpful.

  2. I have seen many photos and videos of boilers and piping, for example ads for second hand boilers, and I have yet to see one with system bypass piping. None of those installers seemed to find it necessary. So my question is, do I even need to do the bypass piping?

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  • Pretty sure the intention of the exclusion (due to high temperature water) is for things like radiant floor heat. Cast iron radiators are quite commonly used with steam at 250°F - one isn't walking on them. As for return temperature control, if your boiler wants it, you risk voiding the warranty by not using it. Of course, there are boilers that are designed for "cold start" operation and which do not care about return water temps. But olde-fashioned cast iron ones often do. Commented Mar 12 at 0:05

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