Carbon Monoxide Detectors

Massachusetts General Laws Chapter 148, Section 26F1/2 states:

(a) Every dwelling, building or structure, including those owned or operated by the commonwealth, occupied in whole or in part for residential purposes, that: (1) contains fossil-fuel burning equipment including, but not limited to, a furnace, boiler, water heater, fireplace or any other apparatus, appliance or device that burns fossil fuel; or (2) incorporates enclosed parking within its structure shall be equipped by the owner with working, approved carbon monoxide alarms in conformance with the requirements of the board of fire prevention regulations; provided, however, that such requirements shall include, but not be limited to, a requirement that a landlord or superintendent shall install either approved monitored battery-powered alarms or approved electrical wiring alarms as defined by the board, as are required to make the alarms operational at the beginning of any rental period by lease or otherwise and shall maintain and, if necessary, replace batteries or such battery-operated or electric hardwired carbon monoxide alarms annually thereafter to insure their continued operability.

So, not only must your landlord install the carbon monoxide detectors, she must keep them functional.