3v0
Platinum Member
Whats the difference?
There are several ways to heat the block. Kubota uses a freeze plug heater where you have to pry out a freeze plug and insert the heater. I have seen these rust through.
A lower radiator heater is installed by cutting the lower radiator hose and clamping the pipe like heater in to splice the hose back together.
Before and after

Both are good solutions in that they heat the water. There are other types of heater like the magnetic one Astanton mentioned, head bolt heaters, and even dip stick heaters.