over the years in working in large honey houses and small I have found that the capping wax is usually the limiting factor in getting more honey in the pail. As far as I know all melters work on the same process which is they melt the wax which then floats in the liquid form to the top.... the honey is then drained off the bottom and the wax is drained off the top. the fancy ones have a slum gum rake that removes the slum gum.
at some point your 'potential' honey producing capacity should answer the question as to what kind of wax melter to use.
this year I purchased a very much used Kelley wax melter, although I would guess it will be next year before I get the opportunity to use it. Kelley (as far as I know) still makes these in two sizes with some estimate in the catalogue as to capacity of each.
The melter is also an uncapper and the bucket separates the wax from the honey. Heating to less than 150 F. for a minute or less isn't going to affect the honey much, if any. It drains out of the melter as fast as it will flow.