radiant heating

Hi, I would like to connect a wood stove to a cast iron radiator. Sounds like I need an open water heating setup. Does a system like this need to be connected to mains water? Most of the line drawings I'm seeing show the system connected to a water tank. I don't need a water tank, do I need to...

I have a 2017 Viessmann Vitodens 100-W condensing gas boiler connected to a radiant floor heating manifold. No external pump. 120m2 floor area. Recently had the annual service. Boiler has been on for about a week now heating the underfloor heating cement slab. It is my impression that the...