That connector is much better.
54deg is way to cold, by the time it gets to brush will a good run of hose its almost 30deg. I like 50 deg a brush
like i say the 54 is what they say it is, i still have to test it to find out what the temps really are.
they say that, for example if the temp on the glass is -1c then the hotest you can use on it without it cracking is 20c highter in temp.
plus hotter water damages the rubber seals on windows, and the hotter the water, the quicker it freezes too!