heat pump kw ratings

I have just read an advertisement that is trying to sell heat pumps-I don't think the brand really matters but they say with 1KW input they can produce 5KW output. Now I understand there is a portion of "free" heat shell we say by the very nature of the system but an extra 4KW seems abit much- So my question would be is this the normal amount expected ie- 1KW in--5KW out. Now I have read the little fine print it says that the input is 1KW (230V/4.3A) but the KW output is in what they term as heat output. Are these two terms the same?
cdd
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You need to look at the COP ratings for heating. COP will be lower at colder outdoor ambient temps.
There will be a range like 2.0 - 4.5 with temps from 0 - 65 F
Each unit is rated at 17 and 47 degrees. If you look into the tech data, they will list the complete set from 0 - 65 F
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Thanks for the info-makes sense-quite suprising how much the ambiant temputure changes the output of the unit. cdd
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