I dont see a problem with keeping the system @ a working temperature .... as opposed to enhancing the system by heating.
Safe commercial methods exist for NOS cylinders.
http://www.turbobits.co.uk/acatalog/dynotune_105_2lb_nitrous_oxide_bottle_warmer_kit.h tmlhttp://www.turbobits.co.uk/acatalog/..._bottle_warmer _kit.html
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