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Hot feed to Heat exchanger is on gravity flow (as is sensor) Cooled water from exchanger returns to gravity return. Difference in temp will increase gravity flow (which would just about stall at 95 degrees) more cooling performed by exchanger the faster gravity flow through exchanger - the faster cooling takes place. When temp goes below 95 in top of gravity flow circuit (hotest part of circuit) the sensor shuts off the valve.
.......so at 95 degrees on one side of the heat exchanger.....you intend to flush the other side with mains water to reduce the temp?
correct?