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drill
I changed from oil to gas but I'm not aware of any drilling that had to be done. Can you clarify what you mean. Also, as I've never heard of Infrax, I guess you need to say where in Belgium you are located.
I had the same response from my gas supplier about the trench though they would drill the hole through the wall of the house and they gave the measurements so that I could dig the trench myself.
I spoke to the people who were going to install the actual boiler and asked for their recommendation for the trench and it was the gas supplier who dug it. No-one could explain why I had been told that they would not do it.
Just for your information, the whole thing is done in 3 stages and they don't have to be done immediately one after the other.
The trench has to be dug first; then the supply has to be connected to a meter in the house; finally the boiler has to be installed. You do not pay anything for the meter and connection until you actually start using gas - in my case it was several weeks later.
Good luck.