I have three 200w Ehiem Jäger heaters plugged into a heavy duty extension cord. I then cut the extension cord at the best placement for the Ranco and wired the Ranco into the extension cord. Works great! Jäger heaters are very good, just set the internal thermostat as BeanAnimal suggested as a backup to the Ranco. The Jager's have an adjustable set point which makes ths easy.
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