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That area should be loaded with good hydronics guys.
Here is some information from one of the leaders in hydronic systems: http://www.taco-hvac.com/uploads/FileLibrary/100-2.9.pdf

Seems as if it weren't for bad luck, you'd have no luck at all. Mr. Murphy seems to have moved in with you.

If you said, I don't remember where you said you lived, other than the beach.

Please...

I guess the idiots will pay for water damage from frozen heating pipes even since there was not a heater malfunction.

Some who knows what they are doing should have a rig to purge & add antifreeze...

High capacity baseboard will give you about 850 BTU/ft vs about 590 for regular with both at 4 gpm & 180* average water temp.

Antifreeze damage?
One relief valve is all any system should have....

The only downside I can see is the loft is probably going to get warmer (how much?) than you want since the second floor stat is going to be the control.

I was referring to electrical load in the...

You have to determine which ciculator is for which zone & how they relate to the zone control panel. Once you find out which set of stat wires controls which circulator, you can move the circulator...

Thanks Cat, now if I can remember that for more than a day or two...

You need to connect the loft thermostat wires to the same relay terminals as are the second floor stat. There should be some kind of relay near or on the boiler. Pictures of the boiler area,...