I would call LG and ask about it if you really want that model.

There's also the factor that frontloaders and HE toploaders take in a much smaller volume of water than old-style machines. Much of the heat in the water is absorbed into the material of the basket/drum, outer tub, and the fabric of the clothes and there's not as much water volume to counteract that heat loss. The temp of the water in the tub can easily drop 15°F by the time fill is finished. One of my non-HE toploaders controls incoming warm fill to 115°F ... but the temp in the tub is 102°F to 105°F when fill is finished.

Longer wash times on machines nowadays also results in more lost heat through the wash phase.

Purging the hot supply line by running a sink tap nearby or "downwind" (so the hot water has flowed further past the washer's supply tap) can help minimize the initial cold flow.
It can be difficult to determine exactly when the heater is active on machines that have one. Heaters are, of course, active during steam cycles. Usually on an Allergy or Allergen cycle. Sometimes on a Heavy cycle with higher soil levels selected. Water heaters typically never operate on the Normal cycle.

Presence of a Sanitize cycle was indication of water heating in years past but not so much nowadays, especially if the cycle is labeled "Sanitize with Oxi."

The Auto Temperature Control “feature” dumbs down a Hot wash yo tepid. In order to get anything with oils truly clean, and that includes sweaty clothes with body oils, you need the application of hot water.

You can never be too skinny and you can never have hot enough water for a washer. Get the one with the heater--you will regret missing out on that temp boost, just when u need it, which is likely going to be often.

My lg 3700 has an internal heater. Here is a link.

https://www.costco.com/lg-4.5cuft-front-load-washer-and-7.4cuft-electric-dryer-with-wifi-capability-with-optional-pedestals.product.100430236.html

Be sure the internal water heater engages on all cycles, for all temperatures. This might require some research.

For example: COLD water in the dead of winter can be icy cold in the machine, but COLD water on my FL washer with internal water heater (that engages at all temps and wash cycles) is 86°F, and so forth.

Some washers only use that internal heater for Sanitize or Allergy cycles. Buyer beware.

Cavimum, it'd be helpful to cite the brand/model of your washer. I'd bet it's a Miele. I highly doubt that a Samsung, LG, GE, Whirlpool, Maytag, etc. with a heater on the U.S. market will engage the heater to raise the temp of a cold wash. ATC may add some hot or warm to the cold, with the purging of standing cold water in the hot supply line being a factor in how much can be added.

dadoes - yes, you are correct, my washer is a Miele W4842. The owners manual gives the actual water temp (in Celsius) for each temp choice.

I made sure to get a machine with a heater though I have to confess that I am not sure if I have used that feature more than twice in the past year. Still I guess worth having.

I have a Whirlpool 85 and am reasonably pleased.