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Thanks oil lp man. Your response got me to wondering what sort of incoming water temp might constitute a shock to the boiler? One of my zones is a new addition for my mother, who is currently at my...

Have a Vaillant gas fired boiler (140K Btu/117K Btu DOE/102K Btu Net) with perimeter baseboard radiators upstairs (3 zones - 2300 sq ft)& a heated slab (PEX tubing in concrete) in 60% exposed...