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Why I Prefer Hydronic Heating by Gordon F. Tully Residential heating systems are nearly always designed by the installer, except on very large projects or in special cases involving indoor swimming pools, solar heating, historic houses, and so on. And even on projects designed by engineers, the installer is likely to make substantial changes on site. Fortunately, good heating installers usually know more than you do about installing piping, boilers, controls, and pumps. They have to make hard decisions about complex issues that trouble even the experts, so don't be surprised if they don't agree with your point of view, however logical. Installers may even seem touchy and opinionated at times, but they are the ones who must guarantee the system. In general, it's