Boiler Installation and Replacement in Boston, MA

• "How did you size it?" — building heat loss, not the nameplate
• "Phased replacement — is it an option?"
• "What is the tenant coordination plan?"
• "How is combustion verified at startup?"
• "What permits and inspections are included?"

On a 12-unit building, the efficiency gap between a 1970s atmospheric unit and a modern replacement is not a percentage — it is a fuel bill. But the savings only materialize with heat-loss sizing across the building’s actual envelope, near-boiler repiping, controls modernization (staging, outdoor reset), and startup tuning verified with instruments. Oversizing is endemic in legacy buildings — the old unit was sized for leakier walls — and an oversized large boiler short-cycles away the efficiency it was bought for. On two-boiler plants, phased replacement (one now, one later) spreads cost and keeps heat during the work. Get the building heat-loss number; everything else follows it.

Boston replacements live or die by the flue: century-old masonry chimneys sized for ancient boilers cause condensation and draft problems with modern units. Every replacement quote should include a chimney inspection and usually a properly sized liner — the liner is not an upsell, it is the difference between a boiler that drafts correctly for 25 years and one that soots and dies young. In shared buildings, verify the flue serves only the boiler being replaced; shared flues and abandoned connections are common in brownstone basements. A quote without a chimney line item is incomplete — for oil or gas.