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miro_o
@Dammit
It's related too, but not directly analogous - given different levels of fitness 175bpm can be 270 watts or 330.
So whilst HR will tell you how hard your CV system is working, it won't tell you how much power you are putting out, or rather it will but only in fairly general terms.
I do have a PowerCal which essentially derives power from HR, and it tends to be fairly accurate for average power (fairly meaning out by 10-20 watts) over a long ride, but it's particular weakness is short duration power (for e.g. climbing in the Rockies next week) which it tends to hugely inflate - 2,700 watts when you are putting out 850 say, as it's done mainly on HR variability (AFAIK) which "rewards" sudden surges in HR with a massive power figure.
If I can't sort anything else out I'll use it, I'd simply prefer to use something more accurate.