Just my opinion, but running all that copper tubing (you probably want at least 3 or 4 wraps for a 6 gal bucket), valves, pumps, insulation and a sorce for heating up the water sounds like it might be more expensive in the long run than just using the heaters. What size of kits are you thinking of buying. If you get the Caswell 4.5 gal triple chrome kit, it comes with all the heaters in the kit, one for each solution, then you would only need a couple more for anodizing.
As far as using the same heater for different solutions, I don't think that would be a problem as long as you rinse them well between solutions. I WOULD USE A SEPERATE HEATER FOR THE CHROME AND ONLY USE IT IN CHROME. If you rinse the heaters and switch tanks, then wait an hour or so for it to get up to temp, you might find that having a heater for each solution is well worth the cost of your time.
Hope this helps.
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