Hold my beer…
15 gal? Use a beer keg.
Heat using a water bath (baine marie) made out of a 55gal drum
See Eg “Maria”.
Homogenize? Remove keg from water bath, and roll it around the shop floor?
Don’t have space for that?
Take one of these harbor freight furniture dollies, place it wheels up on the floor. Now you spin the keg in place.
See How do you Homogenize? for further details.
Bonus points: use OEM keg, get a tap for it. You can now use N2 to dispense liters.