Are you guys selling the custom halo coil on its own / modular / ala carte ?

No. Right now we are focused on making the best gear out there and as many of you know this has been a LONG time in the making. Constant redesigns, prototypes, and destruction tests went into making these eKettles the best home electric brewing on the market. And we didn't settle for a common, off the shelf straight or ripple element. Instead, we designed a low watt density halo element, modeled to work exclusively with the specific eKettle (even the specific SIZE eKettle) to create a design is better suited to distributing heat evenly throughout the kettle, in addition to fostering an effective whirlpool and trub cone formation. 

Simply put to make the best eBrewing set up on the market, we had to start from the ground up.