Mark, I understand. Your Duet was made in Germany I believe. My 2010 (introduced in mid to late 2009) was the first generation of Duets produced in Ohio and was the first direct drive Duet. I thinnk mine was designed whereby the heater came on as default for Whites, Bulky/Bedding, Heavy Duty, and Allergene. But I will tell you this, my hot wash associated with Heavy Duty didn't always get hot enough to require a cool down spray at the end of the wash (122 or 125 degrees) like it does for Whites. Me personally, I want hotter water in a front loader because I wanted freedom from LCB and the Duet gave me that. Fabrics/garments I use to use LCB, I noticed started lasting much longer with the higher wash temps versur chlorine bleach usage. 113F just doesn't cut it for me that way in cleaning and stain removal. I've never minded the long cycles if needbe. I have high expectations for my appliances when it comes to performance and delivering the goods as far as what they are designed for. Hence BobLoads for laundry and dishware expectations.
Here's the rundown from what I've gather from my source
For Normal and Heavy Duty on the LG, the heater definitely comes on to heat to those high Ex hot temps. Normal has the very dumbed down temps for warm and hot. If you add steam, hot temp is 104F. Similar for Heavy Duty. For Bedding, Permanent Press, Towels, and Whites warm & hot temps are 90F & 113F respectively for all those cycles.