Hopefully this is the correct group. I am technically off grid.

I'm looking for advice on setting up a tankless hot water system. In the past I used Joolca but this was at a rental property and now I'm on my own.

Joolca price is a bit steep. Given that I'm about to be hooked up to the electrical grid, the $700 nomad version seems high for what I can get with other manufacturers. But I need the shower/kitchen faucet (NOT the basin) options.

So my biggest question is over universal connections. Seeing as Joolca is the only one to offer a kitchen sink option, complete with a Y-adapter so both shower and kitchen can run simultaneously, what I'm trying to find out is if the quick connect hoses of the competitor's are universal? I.e., can I go to a hardware store and buy a compatible Y-adapter and quick connect to attach to a kitchen faucet of a Camplux/Eccotemp/etc? None of these online retailers cater their "accessories" to this scenario. And I'm too much of a plumbing noob to understand.

Thanks.