Today I took my 59 year old (female) self into the 2' tall, 2200 SF, crawl space and made a schematic of the hot water supply circuit in our house. I want to improve the 2 minutes it takes for hot water to reach the kitchen tap. We inherited this mess. It looks like previously they tried a second in line hot water heater and a recirculating loop at the hot water heater bottom, but those have both already been disconnected. I attached a sketch (not to scale). Any ideas how to improve this? Thanks! Mari