Are you quite sure about that - doesn’t seem warm enough to me at body temperature or 1 degree over. I’d have though 42 for shower and 48 for a bath (which will cool fairly quickly).
38c is the official anti scald max temperature which of course you can usually exceed by further twisting of the valve. Each to their own of course but the max temp at the tap etc in France is 41c from memory, still proves the point about not raising the temperature only to reduce it again later.
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I’ve seen this setting on shower mixers, and always pressed the button (where present) to move past it. Obviously you can’t get scalded with luke-warm water. 
Some like it hot 
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So I have been playing with my new boiler just to see what it does ,other than the obious! if I turn it off and then back on it will go into sanitare mode and flush through the system, it will then purge the system of air and give me a rundown of the system including how much gas I have used for heating and the figure for hot water .The boiler menue is in French only, as are the manuals ,the theromastat is programable into very many languages.
Any weather compensation settings, these can really help as the boiler works less hard with warmer outside air temperature.
That I do not know yet, I do not understand most of what is on the menu on the boiler my French is fine with ordering anything in my local bar ,which all honesty is not a high end cocktail bar, coffee/tea / 3 draught beers /whisky and two brands of Anis + bottled coke and a whole host of fruit flavoring`s, everyone supports Marine Le Penn 
So I am only slowly working through what does what.I was not at the house when the technicions finished installing the boiler, Doctors appointment which is something of a misnomer as I have never yet a seen the Doctor within at least 2 hours of the stated time, but hey if it was easy it would be boring. 
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The giveaway should be a small outdoor sensor, usually on a north wall.
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Nope have not seen one of those, I will take a look tomorrow, will this or be hard wired or wi-fi .
Honestly I dont know, out of all the people I know, a lot with condensing boilers, none of them have weather compensation, such is the gap in knowledge from gas boiler and even heat pump fitters.
This is the outdoor sensor for my vaillant and its hard wired.
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Mine have this on both showers and I learned my lesson when pressing the small button further than the automatic setting - ouch!
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I have had a look and no I do not have a sensor. and having had a quick look online I have drawn a blank at the two largest Brico`s in the area.
I checked our shower this morning with the kitchen probe - 37 to 38 - which surprised me because I’m used to handling materials at 37 (incubators) and when using showers with a limit button, usually want hotter than the upper limit. It feels warmer than that.
Out of interest what boiler do you have? It is certainly something I was made aware of a while back but as rare as hens teeth in peoples homes. I suppose if you just set the condensing boiler outside of its condensing mode 55+c temp then spending another few hundred on a weather compensating controller would be pointless. I hope to run my new boiler on the same low flow temperature ideal as a heat pump setup so I am increasing the radiator output size. Its a 12kw boiler as there are not many below that size and yet setup correctly a 7-8kw heat pump running low and slow can produce a comfortable environment without large bills. If that works then gas in the UK being so much cheaper should really cut my heating bill and make what is a cold building much more comfortable. (Solid wall construction) I am increasing or replacing the insulation as well, especially under floor which I originally used the recycled plastic insulation that has turned to plastic dust over the years just like one of those plastic carrier bags that falls apart after a while.
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My new boiler is French (Atlantic ) it is available in the UK, in fact it is cheaper to install in the UK than in France but here the cost of any work is increased by the high social charges and short working hours that is prevalent, nevertheless I am pleased with it .
I looked into your Atlantic boiler via a google search and the control box Navisystem 3000? Could not see any mention of weather compensation.
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Always had Atlantic goods here, OH wouldn’t install much else as they are dependable and I currently have the big 270L cumulus in my heat pump system.
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My French hovel is used 4-5 months a year in the warmer periods, so using sleeping bag terminology it’s the equivalent to a 2+Season house. My only source of heating is a wood-burning stove sat in the combined kitchen cum living-room (plus manual labour!). I do have an electricity supply, but there’s no mains gas.
I consider it important to keep the wood-stove door closed as much as possible, to keep the number of flooding events to a minimum:
My plan is to fit a flap in the new floor to the bedroom above, so that heat can more easily rise when needed.
Ideally I’d like to install a ground source heat pump when I get a digger in to lay a long drive, and then have underfloor heating, though I suspect I’ll never have the capital to do it.
I have made enquiries with the Maire about fitting solar panels but that currently remains a no-no, at least until the Revolution. I’m located on the edge of the hamlet at the heart of a tiny but charming Commune of approximately 131 souls, but just within sight of the disused Listed Church.
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When the global elites stop flying around in their private jets, I will stop using my log burner, so not in the foreseable future. Whilst PM2.5 and 1 are of concern those of us who have tested the home with air quality monitors can say that they better ban frying your breakfast and vacuuming your home even with a HEPA filtered vacuum cleaner. As both of those raise the PM’s higher than my unit can measure and it remains there for hours and hours. My unit tops out at 500 micrograms/m3 wheras the wood burner runs around 9-13 and only rises temporarily to about 20 when refuelling and drops back after about 10-15 minutes.
Good luck with your plans.
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Yes I went to Leroy Merlin today (In case you are unaware they are a very large Brico in France /Spain/Romania /Italy /South Africa etcetera …excetera and they did not see any mention of add on gadjets