Black Diamond Plumbing & Heating

A pipe let go on a Saturday and water was coming down through the basement ceiling. The homeowner called Mike at Black Diamond in a panic; he was at the door within twenty minutes, helped get the water under control, and pointed them toward a cleanup company. That May 2026 account is one of several like it — a water heater that burst late on a Friday night and was replaced first thing Saturday morning, a boiler that gave out in the middle of the coldest weekend of the year. Black Diamond Plumbing & Heating works out of Winthrop, and its Massachusetts plumbing licence is active. Mike runs the jobs with Dave and a small crew, and what customers mention nearly as often as the repairs is that Mike picks up the phone himself — one caller in March 2026 said that alone set the company apart from contractors he had tried before. The everyday work covers both trades. People describe new boilers, including a high-efficiency replacement in July 2024 for a 25-year-old system that had begun spewing carbon monoxide, along with annual maintenance on an ageing furnace, a radiator moved, and a hot water tank swapped on a Saturday. On the plumbing side: a dedicated laundry drain added during a December 2025 basement renovation, a stainless sink and a broken vent pipe, a gas line run out to a roof deck, a gas stove installed, a garbage disposal cleared. Some of the detail is what customers remember. In July 2025 one of them was at work while a leaking basement drain pipe was diagnosed, and got photos and video as it went — plus word of a second leak in the same pipe he had not noticed. In July 2024 another was told about a draft problem after a water heater replacement so it could be made safe. Reviewers across both years describe the pricing as fair and explained before the work starts. Twenty-nine Google reviewers rate the company 5 stars, and the written accounts run from July 2024 to June 2026. For a burst pipe, a dead boiler on a cold night, or the plumbing side of a basement or condo project around Winthrop, this is a small shop that answers and turns up. Ask what an after-hours call costs, and whether your job is a repair or a replacement, before the truck rolls.