type L or type K copper pipe for hot water heating

[forumfun]

Which type of copper pipe should be used in hot water heating system, type L or type K?

thanks

[Chad Fabry]

Either is fine. K = malleable soft copper, heavy wall. L=hard copper heavy wall.

M=hard copper lighter wall.

[Figaro]

M is your basic piping for almost anything water except recirc lines which should be type l. Type l is also used for refrigeration as long as its acr grade. Type k is used for gas line service. All can be soft or hard drawn dependent on what you need it for and ease of install. If you looking for water piping spend the extra and get type l. Will always last longer. And don't forget type l fittings and long sweep elbows. Will last a lot longer as well.

[plummen]

Around here we use type k for water services