I let the tap water get hot then filled my G-20 (reservoir and bowl both). After a couple of minuters I dumped it out and filled it again. I let the brush soak like I normally do while I apply pre-shave. Then I soaped brush, dumped water from lather bowl, created lather and commenced shaving. Gotta say there was no difference at all in the shave than when I put the scuttle in the MW for 1 min, 40 seconds. So the shave is the same. The determining factor will be time management and I doubt if that will amount to anything. I hate having nothing to do while something warms up or whatever.

Does anyone else try to manage the time when shaving? I hate just waiting for something to happen while I do nothing.

Anyway, the only reason I'd need to use the MW is if I wanted the lather HOT. I don't. Another thing I think deserves mentioning is the fact that the hot water heater in our house is not turned up that high. The temp is just hot enough that it's pretty uncomfortable to put your hand under it but it won't burn you at all. If the hot water in your house is hotter than mine that may make a difference. It may heat your scuttle up faster.

On a warm lather vs cold (room temp) lather note I think I'm a warm lather guy for the most part. Maybe the cold water shavers can put the scuttle in the freezer. Frosted scuttle instead of the frosted beer mug. I like a cold shave once in a while but I tried water chilled in the frig for a couple of hours. TOO COLD!

Jack