The shower at the rear of our house is the one I use. It's quite a distance from the tank style water heater and takes forever to get hot water out of it. It's a stall shower with a low flow head so there is no option to run a full flow tub spout to speed things up. I run the tap at the sink to help get the cold water purged from the pipes faster. Ideally, I'd like to install an on-demand type of heater at that end of the house. With the Affinity pair in that same area, and considering how little water the washer uses (too little in my opinion), if one didn't run the hot water at the laundry sink first, selecting "hot" or "warm" on the washer settings would result in a cold water wash. I don't think the Affinity's on board heater kicks in except on the "Sanitary" cycle but I may be wrong about that. Regardless, an on-demand heater would resolve this issue for both the washer and the shower. Just too expensive to consider currently.
Ralph
Ralph