MGL c.146 + 522 CMR (Board of Boiler Rules); heating-boiler rules 522 CMR 4.00 effective Jan 17, 2025. Enforced by Department of Fire Services Boiler & Pressure Vessel program (district engineering inspectors) and authorized in-service/insurance inspectors; Board of Boiler Rules (within DFS) writes 522 CMR. Verified on the primary source, re-checked weekly.
Steam boilers: internal and external inspection yearly. Heating boilers: external yearly; internal yearly (steam) or every 3 years (hot water); certificate posted near the boiler. Exempt: private residences, units of 3 hp or less, small low-pressure heating boilers.
Source: primary document
Statewide layer. County and city amendments sit on top; the building view resolves them from your ZIP.
In force; Board meets first Thursdays of May and November with a mandatory hearing on rule-change petitions; no proposed 522 CMR amendment posted
There is no federal boiler certificate; the state program below is the whole obligation, with the ASME Boiler and Pressure Vessel Code and the National Board Inspection Code as the referenced standards.
MGL c.146 + 522 CMR (Board of Boiler Rules); heating-boiler rules 522 CMR 4.00 effective Jan 17, 2025. Steam boilers: internal and external inspection yearly. Heating boilers: external yearly; internal yearly (steam) or every 3 years (hot water); certificate posted near the boiler. Exempt: private residences, units of 3 hp or less, small low-pressure heating boilers.
Department of Fire Services Boiler & Pressure Vessel program (district engineering inspectors) and authorized in-service/insurance inspectors; Board of Boiler Rules (within DFS) writes 522 CMR.
Nothing is scheduled. The rule above stays in force until the state adopts a newer edition or amends the program; AHJ Radar re-checks the source weekly.
One address, every authority that can cite it, and a record of who saw what. Cancel anytime. Public pages stay free.