Hi folks, I am having a problem with reverse circulation. I have attached a photo. The insulated pipe making the tee is the H/W return. Pipe feeding in on the left is the Rad return and the pipe to the right continues to the boiler. Because the pipe to the right has a tight bend i wondered if this could be creating increased resistance and forcing hot water up the rad return? I am a DIYer so really haven't a clue.