Heating comparisons?

[booster]

There have been lots of different (at least compared to a Suburban noisy) heating systems talked about lately. Floor radiant, hot water, diesel, propane, different styles, etc.

Has anyone seen a comparison of how much 12v power they use? Based on style and design, I would think they could vary a whole lot as things like liquid pumps can use a lot of energy compared moving air.

[avanti]

I have the Rixens Espar D5-based hydronic system. The coolant circ pump takes around .8 amp. The Espar itself bounces around but probably averages maybe 4-5A when running. The air fan is about .6 amp.