After researching the upgrades to lower the power requirement, I'm noticing the heater still says max electricity consumption is 400MW, and it is consuming that much. I've tried both the manual and automatic setting to change it but that's had no effect. It may be an idea to re-work it so you can change both the heater and reactor recipes manually?

The max consumption is not changed because that's not possible factorio, instead the time/energy the recipe uses is changed. I'll propably add an option to manually choose heater recipes when I release the angelbobs compat patch.