Hmmmmmm - - - - think I have an electronic copy of the Harris - - - but what is the one my Wise called - - please?Hi Doug,
Personally, I avoid the complexity of the firebox of locomotive-style boilers. I don't need to do all that work for stationary boilers.
But a very efficient/powerful "stationary or marine" boilers is the 3 tube with multi-water-tube Yarrow type of boiler. I have a book with about 50 designs in it... the best I have read - by K.N. Harris. But there is another highly recommended that I have not bought yet... by Alex Wise.
Worth getting one or both to help you make the decision,