I guess I need to up the flow on one of my wands. I run standard 6 flow at 450. I know I am wasting heat. I think I will up the flow to a 12, 6, and 8 flow. The reason I am concerned about uping the flow is using too much water. Right now turning the water on is not really an option on some of the rentals I clean. Yesterday I cleaned a house that I used a pump sprayer for most of the job and hf for two rooms, keyed the wand on the back stroke only, and did everything I could to conserve the 75 or so gallons I had on board. I was working my down the steps which was the last thing I had to clean and ran out of water with four steps left. I had to knock on the neighbors door to get permission to hook up to their water supply. This rarely happens but would happen a lot more if I doubled my flow rate.