I have a 16 gallon Maxant bottling tank with the no drip valve and love it, Just wish I had gotten the bigger one.
Is yours a "tank inside of a tank" or "jacketed"? it does not look like it from the pics, looks more like the water to warm the tank is only on the bottom. Mine is a tank inside of a tank and the heating element has an adjustable thermostat. I unplug the thermostat instead of turning it off, that way it will stay set to your desired temp. I try to run mine at 100 F and let honey settle for at least over night before bottling. Kelley use to have a good selection of heaters and pics. if you can find the maker of the heater then look them up on the net. It has to have a thermostat on it some where and may be adjustable, just might need a screwdriver.
Instead of a plastic gate I would swap it out for a ball valve or the no drip valve. You will not be disappointed. The plastic gate will be a dripper, I do not trust them for any long term storage.
Mine has a sight tube on the side to tell how much water is in the jacket and a thermometer that goes to the inside of the honey tank.
For a hundred bucks you did not get hurt at all, if you were closer I would give you your money back.