[The Coastal Craftsman]

Fix all the leaks you cant find and do a wet test after you have done an air test but only take it upto 5bar to start and let it sit for 10 mins then check pressure then take it upto 10 bar for 20 or so min's and if ya really want to stress the system then take to 15bar for the next 20 mins. If you dont have any problems at those pressures then you should be fine. Even shark bite type fitting are good to over 15 bar so you will be fine if there's any of them in the system. The shower valve and bath vavle should be fine as it will expand the copper way before brass will expand and crack. But no promises.