Before I start messing around my radiator and boiler settings, I was hoping to get some expert insight on how radiator settings affect the boiler and flow. I'm obviously not going to turn them off in this brutal weather, but will turning off radiators in unused rooms or shutting them all down make my boiler work harder or cost more? Is there a safe way to turn radiators off, or should I leave at least one on for flow? They're all currently just set to max. Boiler is around 10 years old if that changes things (combi).
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