Match the listing to a particular appliance
Request the complete manufacturer and model designation from the permanent label, including its letters or suffix. Keep a legible photo if the seller can safely see the label on the cold, accessible unit. A part number on the door or blower, a decorative badge and the name on a sales receipt can each refer to a family of products rather than to that individual heater. Do not ask the seller to disassemble or tip an insert to get a picture.
Read the number in context
EPA provides examples of the hang tags used to describe tested wood heaters. The tag and permanent identification can help trace what product is being offered. Neither documents how it was removed, whether parts were left behind or what happened to a baffle in transit. Put a separate mark beside installation and condition questions so that an answer about emissions does not accidentally get counted three times.
Make the sale conditional on your own fireplace
Find the manufacturer’s installation manual for the full model and provide it to the person assessing the receiving fireplace. Ask about the hearth protection, connection and vent arrangement shown there. Discuss what could make installation unsuitable before paying transport costs. A sensible stopping point is a seller who cannot identify the unit or an installer who cannot document a compatible pairing; another listing may have the information needed to proceed.