Getting hotter water out of my hotwater system

I brought an old house and the hot water system was from the 1990s and the hot water to come out of it was amazing. Absolutely loved it.

Anyway it rusted out and I had to replace it yesterday. The problem is that the hottest it will put out now is only 50°, last night I had a shower with no cold water.

The installer said they have regulations now that they can't have water hotter then that entering houses these days.

Is there anyone out there that knows how to get around these things? I can add photos if you need.

I found the part that is controlling thwle temp cause u can feel on the copper pipe the heat different on either side of this little connector thing. Iv popped off the cap and cant tell how to move it to change the heat.

Any help is very much appreciated