I saw a post on a forum talking about how good water pumps are now-a-days, and how thermosiphon is a thing of the past. I refelected on how many reports I’ve had of burned down unattended engines due to bad pumps, bad belts, or frozen tension idlers. I thought about my totally trouble free system at Easton. It brought a smile to my face.
Perhaps few of us think in terms of 6000 hours being equal to 100,000 or so of driving, belts, tensioners, and pumps do fail. If you have these parts, make sure you have an over temp shut down, Murphy is always there to bite you in the ass.
The Lister CS was designed to thermal siphon, but you do need a place to carry off the heat, and it need be adequate to work right.