Marisa Andrews says, "On The Mark Plumbing is a one man show of total competence and skill. Mark came to my home and installed a gas combo boiler/tankless hot water heater. I highly recommend him to anybody with confidence. He has incredible expertise in his field, very knowledgeable and he takes the time to do the job right. He answered all of my thousands of questions and always with a smile. He made sure to always lock the bulkhead behind him and left everything clean, probably cleaner than when he arrived! He was extremely receptive when I mentioned the condo association frowns upon driving on the grass, so he walked back and forth from his truck out front to the job site around a long row house building out back countless times. From taking out my old system, to climbing on the roof, to his pipe work, tedious yet flawless, he does it all!We now have heat and on demand hot water effortlessly, all while saving money. For that, I'm truly thankful!He's also Mass Save certified. So if you're thinking about going high efficiency to get that rebate, go with Mark! You will be thankful you chose him over the other guys!"See more