I have been informed most of the pipework on my system is made of the above material. I have an open vented system fuelled by a Baxi Solo 2 boiler just doing the rads. The water is heated by a very old main water heater. I have a small leak on a soldered fitting and am unsure if I need special soldered fittings or should I go for compression. I am also going to change to a combi system but am apprehensive of changing to a sealed system in case I get leaks. Any comments/ advice greatly appreciated. The original leak was due to the kids bashing the pipe with their toys.. Thank you