bob, the little graduates (which I use for rinses only) don't get up to 38 degrees if the machine is set for that. I imagine that the temp in the drum doesn't get to 38 either. As long as you always use the same temp, you'll get consistent results. I have guts from an old cpa that I mounted into a cooler that I use for heating things up as well since I don't have a thermostat controlled faucet.
I mix my chems, put the 1 liter bottles into the machine, and fire it up for about 2 hours to get everything up to temp.