Copper-tube boilers typically have: (a) Better heat transfer characteristics, and longer lifespans than cast-iron boilers (b) Better heat transfer characteristics, but shorter lifespans than cast-iron boilers (c) Worse heat transfer characteristics, but longer lifespans than cast-iron boilers (d) Worse heat transfer characteristics, and shorter lifespans than cast-iron boilers
1) Better heat transfer characteristics, and longer lifespans than cast-iron boilers
2) Better heat transfer characteristics, but shorter lifespans than cast-iron boilers
3) Worse heat transfer characteristics, but longer lifespans than cast-iron boilers
4) Worse heat transfer characteristics, and shorter lifespans than cast-iron boilers