Why not just oversize the rads and run everything at 40 degrees? General advice is not to zone.
They are replacing 3 rads. I assume this is cost saving from Octopus. Easier to run at 50 degrees than pay out for 7 more radiators.
I guess if they pass that cost on, it would take a long time to recoup 7 radiators at .50 COP
@Soul started
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Why not just oversize the rads and run everything at 40 degrees? General advice is not to zone.