Hi All, I have a pool with a Hayward H250 Ed2 heater. It seems the heat exchanger (which I replaced only 3 years ago) is leaking again. I have a couple of questions. 1)If the heater is leaking when the pump is running but the heater is off, does that mean the internal bypass is broken, or is it just not a particularly good seal? The leak is NOT at the header gasket, which was my first hope based on it leaking both when the heater was on or off. 2) If I do not have a manual bypass on my system, has anyone either made or purchased a u-shaped PVC pipe that could connect to the two pipes that normally go into the heater, so I can run the pump with the heater removed? I have looked and looked but cannot seem to be able to find the appropriate fittings that match what is on the heater header. Since the size and distance between the two ports is pretty standard across the hayward line, it seems like something that someone would have designed and made. If not, I guess I would have to cut my existing pipes and insert 2 3-way bypass valves with a pipe between them to be able to bypass the heater completely, correct? The pipe elbows say 1 1/2" on them - I assume that means I need a 1 1/2" bypass? Thank you for any help or suggestions. Also, has anyone had a heat exchanger successfully repaired at a radiator shop?