I think there are some assumptions to be made.
for artica chillers, on their website, they state that 1HP = 12,000 BTU
so a 1/4 hp artica chiller has a 3000/hr btu chilling capacity.
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meanwhile, a 1/10 hp aqua euro chiller has a 1485 btu capacity, that makes it even more efficient at 1hp = 14850 btu
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the teco tr 20 has a 1/3hp but a btu of 2620 so 1hp = 7860 btu
teco tr 15 has a 1/5 hp but a btu of 2065 so 1hp = 10325 btu
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Hailea's website does not show the BTU ratings, maybe the spec sheet that comes with the chiller might.
http://www.hailea.com/produce.htm
so as one can see, (IN THE aquarium CHILLER industry) BTU has no direct relationship to HP.
I suspect though that there is a relationship of HP to actual power.
(thus it is probable, not all 1/4 hp cool equally, but they probably consume the same amount of power?)
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so for the more adventurous. is it possible to calculate a theoretical power consumption of a chiller based on
BTU, horsepower (or actual power), the amount of water to be chilled , specific heat capacity of water and air, the desired temperature and ambient temperature)
I foresee calculus is involved.
http://en.wikipedia.org/wiki/Refrigeration
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I suspect horsepower to be an arbritary labelling in the aquarium industry anyway, look at wattage and btu where possible, for any wattage, the higher btu is probably the more desirable one to get where cost is not a concern
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