Hi all. I'm after a quick bit of reassurance that the plumbing work I have just had completed is up to scratch. I have an open vented central heating system with hot water cylinder in an S plan plus arrangement - 2 central heat zones (one old, one just added for extension). The second central heating zone has just been added and the return flow T'ed into the return flow to the boiler just before re-entering the boiler. The T junction is arranged however such that the 2 return flows (from the old system and the new extension heating) enter the T connection from directly opposite directions and then both have to find find their way down the leg at 90 degrees. Being and Engineer (but not one with a good knowledge of plumbing and pipework) this would not appear to be the best way of going about things as the 2 flows are directed directly at one another and will cause a turbulent flow effect (basically pushing against each other) before they find their way around the corner. This all might be perfectly acceptable in the world of central heating plumbing but I'd be interested to get the advise of others on this forum. Many thanks!!