I am going to recirculate my mash through an extra kettle that I have that is where my HERMS coil will be, I am doing 10 gallon batches and I have a separate HLT. I only have 110 for power
That 110 is the limiting factor, and you probably only have a 15 amp or possibly a 20 amp circuit. With one 15A circuit you are limited to about 1500 watts. I have a HERMS coil in my HLT like that and it works. It might not be real fast for steps, but it can work.
+1 for sure. So glad we run 240V in Oz.
My RIMS runs a 2400W (10A), plus I have another 2400W in the HLT.
2 Immersion elements in the kettle 2400 & 3600 (10A and 15A respectively) makes all electric brewing a breeze.
With only 110V, I think it would be possible as long as you mashed in and hit (or get close to) your target temperatures. Ramping up the temp in a large mash volume could present an issue if a quick jump in temp is sought.