This may be of some interest of a LLH effect on rad outputs. I calculated that the rad output based on your T50 rad rating of 19.5kw and 13LPM flowrate should be 8.13kW (same as having no LLH) with the primary&secondary flowrates equal, if the secondary flowrate is only 1/2 of the primary then the output will be reduced to 6.87kW and in the highly unlikely case of the secondary flowrate being double the primary flowrate then the output is less affected at 7.45kW
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