Instead of doing this with the 24v powering a relay what I have been doing with my 800watt heaters is running them thru the Neptune’s expansion module (I think it’s called) then the power it taken straight from a wall outlet but uses apex energy bar to control itI'm on board with running them from the Apex, I'm not buying that hype spread around that running them on your Apex is going to trash your outlet. Perhaps if you're running 600w+ heaters it may be a bit more on the wear and tear side but there are solutions for that. Working on running mine via the 24v ports to control a secondary relay as a test of theory. When running two, run them alternating 12hr shifts and you'll save wear on the heaters themselves I think.