06-05-2022, 10:38 AM
On the subject of warming up - I have wondered whether the thermosiphon acts a bit like a thermostat. The water in the block is not going to move out of the block and into the radiator in significant quantities until the block has warmed up. It wouldn't be as positive as a thermostat, but may be facilitating a faster warm up than a pumped system with no thermostat or a failed thermostat.