G
garyplumb
I've seen a soil pipe collapsed after heating water had been discharged into it, so it's not ideal to go to the stack but can be done.
Discuss Are you allowed to run a discharge pipe from a cylinder into a soil pipe? in the Plumbing Jobs | The Job-board area at PlumbersForums.net
That hepvo should be vertical for unvented discharge as in g3 regs.
Reply to Are you allowed to run a discharge pipe from a cylinder into a soil pipe? in the Plumbing Jobs | The Job-board area at PlumbersForums.net