How about this, use copper pipe, a tee at both ends capped. One end the cap would be threaded to accept a 2kW water heater element ( about $8 ). All you would have to do is insulate it. Water heater element is meant to be submerged in water, takes 120vac input, and if you can find a light dimmer that can handle 2kW...
Would that work for you?
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