Heatstick materials question... (zinc)

I recently built a heatstick a-la the ubiquitous instructions on the web. (http://www.cedarcreeknetworks.com/heatstick.htm)

I just boiled 6 gallons very successfully with the heatstick supplementing my electric stove. However I have some lingering concerns about materials safety.

All the drainpipes were chrome plated brass. Chrome I guess is A OK.

However, all of the drainpipe nuts were Zinc plated brass. Is that normal, or just the store I was at? I also see read that many of the elements have some Zinc coating, and in general zinc is a no-no.

But people are using these from what I gather. How concerned should I be about this amount of Zinc in my water or wort? Has anyone dreamed up a "better mousetrap" with regards to heatstick design and materials safety? Is it possible to test these... hmmmm

I was impressed by what a great solution the heatstick is from a problem-solving perspective, but it seems to have some unresolved problems of it's own.

the only other possibly relevant information I turned up was in this thread:

https://www.homebrewtalk.com/f51/rims-dummies-114997/index2.html

Sawdustguy said:

These elements are for potable hot water heaters. I don't know if there is a zinc coating or not, but if there is, I doubt it would cause a health risk. The daily recommended dosage of Zinc is 15mg. It didn't take much more than that to plate that element and the coating will last for years.

Click to expand...

oops, didn't realize this was just brought up here: https://www.homebrewtalk.com/f51/heatstick-awesome-142803/index25.html as well