I have a water 'front' in our Glenwood Home Grand, and have had so for over ten years, I guess. I have it tied into the livingroom zone of our baseboard.
I offer the following:
I expected that it would thermosyphon sufficiently to keep the coil OK. It didn't. Not being a complete optimist, I incorporated a circulating pump in the loop. Anyway, the long and short of not keeping the coil sufficiently cool (Made of red brass, by the way) was that I had to replace several bits of pipe that make up the loop.
I find that, even if the temp is on the low side, having the water constantly circulating through the base board keeps the room comfortable on all but the coldest days.
Now, if anyone has suggestions for some sort of low-limit switch I could strap on to the plumbing to control the circulation pump, I'd love that. Everyone and their brother has high limit (kills power at hi temp, I want to do the opposite)
Hope this helps.