Boiler and Radiator Leaks in Massachusetts

In older Massachusetts homes and multifamily buildings that heat with a boiler, hot water or steam moves through radiators, baseboard loops and pipes that run inside walls and floors. That puts heating water in nearly every room, often in places nobody checks: under a window, inside a closet, in a ceiling below a second-floor radiator. Heating water is usually rusty and dark, so it stains oak floors and plaster ceilings quickly, and a radiator leak on an upper floor of a triple-decker can show up as a brown stain in the unit below. Leaks also tend to happen in winter, when windows are shut, basements are cold and wet materials dry slowly.

At one hour, water is usually pooled around the boiler or the radiator, and extraction can keep it from soaking into flooring. By 24 hours it has soaked into wood floors and plaster or drywall below, and stains begin to set. At 48 hours hardwood can start to cup, and mold can start on damp drywall and carpet pad. After a week, floor boards may be cupped beyond drying, plaster ceilings can sag or fall and rust stains can be permanent.

A lot can be dried in place after a boiler or radiator leak when work starts early. The basement slab, block or stone foundation walls and bare joists around the boiler dry well with dehumidifiers and air movers. Hardwood floors under a leaking radiator can often be saved with drying mats that pull moisture out of the boards, as long as the crew starts before the boards cup too far. Plaster and drywall ceilings that are damp but still firm can be dried with air directed at them and, where needed, a small vent hole to release trapped water. Wall cavities behind baseboard heating can be dried through the baseboard opening.

Because heating water is usually dirty and rusty, some materials are harder to save. Carpet pad that soaked up rusty water is normally removed, and carpet with heavy staining may go with it. A ceiling that sags, has bubbled paint holding water or has gone soft must be taken down for safety. Drywall that wicked water from a baseboard loop is cut above the wet line, along with wet insulation. Wood floors that have cupped badly or turned black from long exposure are replaced.

Boiler and radiator leaks happen all over Massachusetts, wherever older homes and multifamily buildings heat with hot water or steam. In the Merrimack Valley, Lowell has a median home built in 1953 with 44 percent built before 1940, and in its triple-deckers and converted mill apartments heating pipes may run through several units. In Western Massachusetts, Holyoke has a median home built in 1950, and Amherst averages a January low of 14 degrees, cold enough to strain an old system. In Greater Boston, Boston dropped to 10 below zero on February 4, 2023, a record low for the date.

The same help reaches Central Massachusetts and Cape Cod. Worcester hit 13 below that same February morning, its lowest on record for the date, and 41 percent of its homes were built before 1940. On Cape Cod, a third of housing units sit empty for part of the year, and a heating loop that freezes in a closed house can leak for days. When you call, say whether the leak is at the boiler or a radiator, and you are connected with a local crew that can usually come out the same day.