We are a small company who is currently developing a new kind of coffee machine.

We are currently looking for a partner who is making the heat boilers and brew head for us. I have attached a overview drawing for you:
Basically there are 3 parts:

(1) Steam boiler.
Diameter 110mm Tube with plates welded on both ends.
Inside there is a diameter 10mm tube which is a heat exchanger.
Also we have a heater inside with 1500W.

(2) Brew boiler
Diamter 80mm, Plate welded on top and a flabe and the bottom.
The pre heated water from the heat exchanger will enter here and the water gets heated to the final temperature.
Also here we have a heat element but with 800W

(3) Brew head
Machined part from stainless steel.
This part controls the coffee brew. It is attached with the flange to the Brew boiler and holds the Portafilter at the bottom.

Because we a are processing drinking water with this parts, all parts I guess should be made from AISI304 or AISI316?

Please let me know what you think and looking forward to hear from you,
Best Regards,
Lukas