The triage call runs a fixed sequence: fuel type (gas, oil, steam — each routes differently), what failed (heat, hot water, or both), error code if the display shows one, how fast it is getting cold inside, and your ZIP. "Con Ed gas, no heat, house at 58 and falling, 10314" gets you correctly prioritized in under a minute.
Two island specifics to mention upfront: basement flooding history — a boiler that sat in saltwater has different failure modes, and flood-damaged controls can fail intermittently rather than cleanly — and whether you rent, since the property owner usually needs to authorize work. Detached homes also cool faster than attached ones, so the indoor-temperature trend matters more here: a house at 62 and holding is a different priority than one at 55 and falling. The triage will tell you all of this upfront rather than after a truck rolls.