I got this pot:
https://www.amazon.com/gp/product/B0085ZPZ20/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
and this propane burner:
https://www.amazon.com/gp/product/B071ZM8YVC/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
I've used this pot for 40lb (dressed weight) BBW turkeys. Too bad I didn't have a block & tackle to pull them out, but fitting them in wasn't a problem. The turkeys are too big for my plucker, but they're easy enough to pluck once scalded, so long as you have a secure place to hang them. Needlenose pliers for the long wing feathers on the heritage breeds.
You could use a water heater element installed permanently into a steel barrel, but that was more fiddling around than I wanted to do. You need your heat at 145-160° and you need good recovery. That means you're gonna want a large enough tank so that a) it stays hot enough during the scalding process, b) you can easily submerge your bird, & c) it can recover temperature before you need to scald the next bird. My ideal temp is 150-155°, but one can't be too picky about these things. Nothing's perfect. I squeeze a good squirt of Dawn in the pot to help the water penetrate through all the feathers.
If you do waterfowl, you'll also probably be floating some paraffin wax on the surface of your hot water which, to me, is yet another reason to use propane--but lots of people do use electric and they like it just fine. I don't know whether they use it for geese, though.
The propane heater works reasonably well. I would say very well, but it's windy here and I have to set up all sorts of make-shift windbreaks to keep it from blowing out. I really should build something but I haven't gotten around to it.
If you use a water heater element you'll need to start your water heating the night (or day) before and you'll likely need to insulate your tank (which can get messy unless you make some sort of permanent outdoor kitchen/processing area. And of course it suffers with regard to recovery time. The propane is easier for me. I use the size tank common for outdoor grilling.
I process alone and I generally do 2-3 chickens or 1 turkey all the way through to the drying racks before I start on another round. My problem is more how to keep the water from getting too hot without turning the burner down until I can't protect it well enough from the wind.