In my previous configurations I added the grain to the mash tun, heated water in boil kettle, pump strike water into the bottom of the mash tun and stir. I have that process dialed in with the help and tweaking of Beersmith. With this set setup I decided to switch up and heat the mash tun jacket, heat strike water in HLT and keggle BK then transfer to mash tun and add grain. According to Beersmith to hit my target mash temp of 154* I needed to heat the mash tun and strike water to 161*(I used the BIAB single infusion in Beersmith). With the use of the Rinnai tank-less hot water heater I was able to dial in the water temp entering the keggle BK and HLT and used their perspective burners to temper the last few degrees. Basically strike and sparge on demand.
Here's a few shots heating strike water and transfering with the mash tun in its brewing position. (sorry about the blury photo's)