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Mono flow delta P circulator or delta T circulator ?
Cape style house with monoflow diverter valves original to the house. The house was expanded upstair and heated by baseboard and heat output is comfortable. After the conversion oil to gas boiler. The new boiler heat output on the monoflow first floor on cold days (15F) just make it ok but not great . The Heat Load Calculation shows 41K BTU loss (LoopCad software) the boiler DOE is 127kBTU. The feet of head 1.19 @ 2gpm on the monoflow first floor. A variable speed circulator would give me more play to get it right. So my question could I use delta P circulator (TACO VR1816) or delta T circulator (TACO VT2218)? The monoflow diverter tee is mainly controlled by pressure?
Thank you for any advice .