New gas heating, natural gas connection directly to the house, gas boiler

Hello,

First of all, a big compliment from me for this forum, really great

Now to my concern

My better half and I have now bought a house that we can start renovating diligently from next week The house was built in 1959 and has a natural gas connection directly to the house, at the moment there is a gas boiler installed from the 70s, which I now want to replace by installing a gas combi boiler. In other words, equip every room with radiators and of course also have hot water from the boiler. I have already obtained an offer from a company that sells me the boiler for 3000 euros and would also install it. So far no problem, but our financial resources are not exactly huge, so I could do a lot myself. However, I don’t know what type of gas pipes I should use. How deep do I have to chisel the grooves? What else do I have to consider? I will sit down with a professional next week to discuss how he envisions it. Unfortunately, I am not a professional and would like to inform myself in advance on how the whole thing works so that I can familiarize myself with the whole matter.
I would be very grateful for some advice

Best regards, Daniel

As a layperson, laying a gas line.... you have to give yourself credit: you have courage. But as already mentioned, you are not allowed to do that.

We have a gas cooktop which was not allowed to be connected by the kitchen installer. I myself would not have been allowed to do it either. I had to call a professional who inserted the hose at the bottom using a quick connector and tightened a nut at the top. A matter of 10 minutes, but he also checked for leaks. And he bears the responsibility if something happens.