Old ways are tried and trusted a good copper job beats anything , soon apprentice's are not getting the proper training in good copper work the nickname some are getting is plastic plumbers had a lad just out of his time tell me there is no need for a safety valve on a solid fuel boiler his instructor in their course told the class this only needed an expansion .. Told him why didn't he ask why they made safety valves in the first place self explanatory I told him the clue is in the name SAFETY lol