Plate Heat Exchanger (DHW) for. Main Combi 25, 30 Eco & Elite. The item "Main Combi 25 30 Eco & Elite Domestic Hot Water Heat Exchanger 248048 7225723" is in sale since Tuesday, August 4, 2015. This item is in the category "Home, Furniture & DIY\Heating, Cooling & Air\Other Heating, Cooling & Air".The seller is "euroboilerparts" and is located in Windsor, Berkshire. This item can be shipped to United Kingdom.