Free checklist
Unit heater quarterly maintenance checklist
A quarterly unit heater round is short on purpose: it catches the wear items that fail between annual services. This checklist is sized for a tech with a phone. Every item says what to look at and the photo that proves the round happened. Work is commonly verified against IMC, manufacturer's published instructions. Confirm the edition your authority having jurisdiction has adopted.
The checklist
Every item, and the photo evidence it needs
The photo count on each row is what RTI would require before the item can be submitted. Work the list here and watch the gate hold, or load it into RTI and let it enforce the real thing.
Heat and air delivery
Heat proven by calling the unit on
Thermostat driven up, gas unit lights or hydronic valve opens, warm air felt at the discharge louvers within the normal delay.
Discharge louvers aimed and unobstructed
Louvers set to throw the air where it's needed, nothing hung or stacked in front of the discharge.
Discharge air temperature read at the louvers
Thermometer reading at the discharge once the unit is running steady, compared with last season's reading and the rise on the nameplate.
Heat source and casing
Heat source supply checked for leaks and damage
Gas connection leak-checked at the unions and valve, electric supply whip and box secured, or hydronic or steam piping dry at the unions, valves and coil.
Shutoff or disconnect at the unit reachable and labeled
Gas cock, electrical disconnect or isolation valves close to the unit, reachable from a ladder or lift, labeled for the unit they serve and not blocked by stock.
Vent connector and terminal viewed from the floor on gas units
Connector joints intact and pitched up toward the vent, no soot streaks or rust at the draft hood, terminal cap in place where it can be seen.
No photoHeating surface viewed through the louvers
Heat exchanger, element sheaths or coil fins seen through the louvers free of soot, rust scale and matted dust that chokes the airflow.
Casing checked for rust, dust and condensate staining
Cabinet sound with no rust-through, access panels fastened, no water or condensate stains on the casing or the floor below.
Fan and mounting
Fan and motor run checked
Propeller or blower turns freely and quietly, motor not overheating, guard in place and clear of debris.
Hangers, rods and brackets checked for movement
Suspension hardware tight, no swaying or vibration walking the unit, isolators intact where fitted.
Mounting height checked against stored goods and traffic below
Unit still hung at its installed height above stored goods and whatever moves beneath it, no strike marks on the casing or guard, bottom of the casing clear of the highest stack.
Clearances and controls
Clearance to storage and combustibles maintained
Required clearances kept below and around the unit, no pallets, boxes or racking encroaching on the heater or its vent.
Thermostat response verified
Unit starts and stops on the thermostat call, setpoint matches what the space needs, no unit left running against a dead stat.
Thermostat placement and guard checked
Stat still on its wall or column out of the discharge stream and away from doors, not boxed in by stock, guard or locking cover intact.
Round findings logged against the unit's tag
Readings, faults and any repair needed entered in the maintenance log under the unit's tag, with follow-up work raised before the heating season.
No photo
What usually sends this back
The failures are almost always the evidence, not the work
- Pallets and racking crept in under the unit heater over the season, so the required clearance to combustibles is gone and the throw is blocked.
- Fan runs but no heat because a gas unit locked out on a fault or a hydronic zone valve stayed shut, and nobody stood under it to feel the discharge.
- Unit humming and walking on its hangers from a worn bearing or loose rod, dismissed as normal warehouse noise.
Verified against
Common questions
6 answers
- What does this unit heater quarterly checklist cover?
- 15 items across 4 sections, covering heat and air delivery, heat source and casing, fan and mounting, clearances and controls. Each item spells out what the person walking the job is actually looking for, not just a box to tick.
- Who should run this inspection?
- The HVAC or facilities tech on the quarterly round through the warehouse and mechanical spaces.
- When in the schedule should this walk happen?
- Every quarter, with a pass just before the heating season so a dead unit heater is found before the space it serves freezes.
- Why do these items ask for a photo?
- 13 of the 15 items call for photo evidence, 16 photos in all. A checklist answer without the photo is a claim; the photo is what makes the record worth something in a dispute and lets a reviewer approve work without re-walking the job.
- What most often fails an unit heater quarterly inspection?
- Pallets and racking crept in under the unit heater over the season, so the required clearance to combustibles is gone and the throw is blocked. Fan runs but no heat because a gas unit locked out on a fault or a hydronic zone valve stayed shut, and nobody stood under it to feel the discharge. Unit humming and walking on its hangers from a worn bearing or loose rod, dismissed as normal warehouse noise.
- Can I use this checklist in RTI?
- Yes. Start a free RTI workspace, build this list as a checklist, and the Photo Gate holds the submit button until every mandatory item is answered and its photos are attached. Approved inspections roll into a branded turnover package with a tamper evident audit trail.
Run it with the Photo Gate
A checklist nobody can submit half-finished
Load this list into RTI, stick a QR tag on the area it covers, and the submit button stays locked until every mandatory item is answered and the 16 required photos exist. Approved walks roll into a branded turnover package with a tamper evident record behind every line.
See all 508 checklists · 6741 items and 5984 photo requirements in total.