Prediction: Jensen sees a small boost in Jensen 65 orders over the next week.
Of the 3 engines I have done in the past week, #85 , #60 ,#65 , I consider the #65 most suitable for this heater application & the best bargain , with its much longer boiler than the #85/#60 & its slide valve & reversing capability , I wish it had the 1/2" bore cylinder , but the smaller 7/16" ID does fine.