Which is more efficient?
Clearly (I think), baseboard water systems are the much more expensive
How much more expensive?
More or less efficient than air? Diff for the hot/chilled water?
I think a water system would be much more efficient, as the zoning is so
much more controllable, effective.
And, isn't the heat transfer to water much more efficient than the heat
transfer to air?
Also, the mass of the baseboard system would tend to even the heat
Also, one has a greater choice of fuels/machinery with hot/chilled water.
Lastly, the water circulating pumps draw very little current, while blower
motors/boosters can draw boucou amps, esp. on startup. Water is also much
Water systems might not be the best choice in very cold climates, unless
antifreeze is used -- which might not be legal in some places.
OTOH, in places that use solar heating and water for energy storage, water
systems could be a no-brainer, at least for the heating part.