Winterizing a boat yourself

[Blue Thunder]

So I've been winterizing my own boat, 4 or 5 different ones over the last 30 years or so. I pulled mine yesterday. It a 2000 Four Winns 5.7 Gsi DP. I have always used the "pull the four hoses off the thermostat block" method of adding the antifreeze after draining the block. In my case, I manually drain the raw water pump because it is attached to the engine inside, not the typical impeller in the outdrive style. I use 2 gallons of AF using this method.

My question is...who uses a different method such as the portable tank that you fill with 5 gallons of AF and connect to the outdrive with the flushing "ear muffs" and run the engine? Does this work and will it work on systems that have the heat exchanger for the hot water tank in boats with a potable water system?

BT