We got three estimates before having our System2000 boiler installed, and were especially impressed with ComfortMaster's professionalism, so we went with them even though they didn't give the cheapest estimate (though it was close, and ComfortMaster did explain the extras they provide to account for the difference). This professionalism carried through to the job itself -- Anthony and his crew were punctual, thorough, patient, and knowledgable, communicating well throughout the project and going above-and-beyond several times (including a snowy morning when they rushed to get to our house so that our morning school/work schedule wouldn't get messed up). The installation went smoothly and we're very happy with the results. I enthusiastically recommend ComfortMaster for boiler installations, and as an aside, also recommend the System2000 boiler from Energy Kinetics -- so much quieter than our old boiler, which used to vibrate the entire house. The data on its efficiency will take some time to collect, but initial indications look good for the project paying for itself within a reasonable timeframe. Keep ComfortMaster in mind - they're certainly at the top of our list!