Bathroom H/C supply question.

Hello and thanks. We are turning a bedroom into a bath and it is located at one end of the house away from all the other plumbing fixtures (kitchen, other baths, etc.)

There was an older radiant heating unit in this room and which had 1/2 Hot and Cold copper running to it but was hooked up to a solar water heater that is no longer here.

The location of this pipe is almost perfect and I am wondering how many fixtures I could run off of this (if any) knowing that the nearest 3/4 line is a good 20 feet away.

The bathroom will have 2 sinks, tub, toilet, and shower w 3 seperate valves..

Is it feasable to use this pipe or should I scrap it all together and just have new pipes run with the drains..

Again, appreciate the feedback

If you do not mind having "very poor volume" in the new bath use those lines, otherwise replace them.

I also don't believe you can use heating pipes for potable water. Any inspector would want to see new pipes for new water.
It spells that out in the code book.

For what you plan, 3/4" pipe, and only two fixtures on 1/2"