I recently had my Central boiler hooked up by the plumber that did my heating system when the house was built. My problem is that when he piped it, he kept the piping on the boiler side of the heat exchanger plate running it the same direction, which means I am running water into the bottom of the boiler and pulling it off the top with the circulator pump. I called him about this and he said the boiler is small enough that there is only a small amount of efficiency lost running it in this direction. My question is, I know the piping is not per the Cental Boiler drawings but do I need him to change it? The drawings show the circulator pump taking water from the bottom and dumping it into the top. He also installed the filter for the boiler after the plate exchanger. Should this also be changed so that it is before the plate exchanger? I have a McClain 126,000 btu boiler with a hot water tank and a hydro air home system.