This is awesome! I'm looking…

This is awesome! I'm looking to build three of these (LokiBoard heaters). The case looks very nice. I was hoping to be able to harness the waste heat this winter. Think it's worth piping these into HVAC? Three of them should be ~ 10K BTUs/hour, but Zack from Pivotal Pleb Tech says you aren't supposed to put multiple units on a single 120v circuit.