[0XDESVT]

Stainless steel would be a very expensive option for this you need 3 outlets on the heater pipe so that's why it would be hard to make out of stainless. You need to put a y fitting in in their and welding stainless would not be cheap or easy either. I actually work in a copper factory and copper is an extremely heavy duty metal, only when it goes through an annealing process will it become soft and able to crush. Household copper does not go through the annealing process and stays hard. Currently i am developing a new heater pipe one that has the ends of the pipes grooved like how you would expand an exhaust pipe that way the stainless steel clamps that i use to hold the rubber hoses on the heater pipe will have even more to grip onto not allowing it to blow off. Mind you 15psi is very small and a good turn on the clamp will hold it firmly in place.