That is fair enough - I was going to ask what kind of volume production you were expecting. I have used heat resistant epoxy-resins from Smooth on (Epoxacast HT) there is a good store there in NZ too can't recall name.
Just note that the temperature would still need to be a bit higher than process temperature but if you are preheating then it should be OK. I have used the pads to heat up a Bakelite rondinax from room temperature it needed to get up to 90degC to reach around 38 internally - at that point the plastic was starting to gas and sustain some surface marring.
The contacts themselves serve other purposes such as tank identification for process selection/amount of rolls etc so you may need to design around fail-safe processing prevent over/under filling etc. If casting embedding a stainless pad on the underside of the tank should be quite easy to achieve so perhaps give it a try? That resin is quite expensive I was only using it for small machinable parts, entire tanks this size will be $$$, if you use a pad you could get away with lesser resins methinks. The pad itself would not have to not have to share any electrical signal, just be a transfer heating element say from a silicone heater.
Just food for thought, good luck with it.
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