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Currently I have a Burnham Series 2 cast iron boiler with one zone of baseboard and no sort of bypass. I want to add a radiant zone and protect the boiler from the resulting low return temperatures. I've been reading on here and the internet about boiler protection, primary secondary piping, etc. There is so much and so many different opinions I'm having some trouble grasping everything.
I'm thinking about something like a Danfoss ESBE valve to raise the return temperature would the be simplest and cheapest route and wanted to know the best way to pipe it. I drew a quick sketch and wanted some help building on it. I know it isn't correct, I'm thinking a pump above the H inlet for the boiler mixing valve wired to run whenever a zone was running would work? You can see where I put one in the diagram then got rid of it. Or am I totally off?
Thank you for any assistance.
Edit: Added a 2nd drawing.
Is this a proper primary/secondary system? Would this basically solve the issue without a mixing valve since the radiant zone is small, about 10k btu?