Euro heating limits: The reason you'll find most if not all European made equipment with an operating limt if around 175* is this. European standards for building and heating system design dictate that your building has to heat with no more than 167* water. This is done in the interest of system energy efficiency. It has been proven that the lower you can run your water temperature, the more efficient your system becomes. If you can't heat your structure with 167* water, your building needs more insulation or you don't have enough heat emitter installed. You can't raise the water temp. They are a bit more serious about energy conservation than we are over here unfortunately.