For Newark landlords, a boiler replacement is a business decision with a clear structure: a planned replacement between leases costs less in every way than a January emergency — no tenant displacement, no emergency scheduling, time to get proper quotes. A new, simple, reliable unit also cuts the two landlord costs that never show up on the quote: mid-winter service calls and tenant turnover driven by cold apartments.
The reliability spec for rental boilers is different from owner-occupied: simpler controls, robust components, and a service relationship in place from day one. If the current unit needed two service calls last winter, price the replacement now — the emergency line will still be there in January, but you would rather not need it.