u/Efficient-Truth-9796

Hi everyone. I forgot to purge the water from a gaz boiler this winter and here is the result. The pipe is in copper and it is only meant to have hot water in it. It doesn't look like it's suppose to handle a lot of pressure. Do you think I can just get the edges as close as possible and make a soft solder using tin and a propane torch ? Or is it more reasonable to make a hard solder ?

Tanks for your answers