We have a hydro hot in our 07 Contessa. While doing routine maintenance I noticed a small antifreeze leak coming from the supply side of the engine pre heat. While attempting to tighten the hose clamp the heater hose connector descenigrated. By the time I could clamp the 2 hoses 5 gallons of Cat ELC was on the ground. The plastic hose connector 5/8 to 3/4 was a $4.00 part at any auto parts store. The lesson check for leaks in and behind your Aqua Hot.
