Checklists by equipment
2 lists · 11 items · 17 photosUnit heater maintenance checklists
Unit heater maintenance checklists for the quarterly and annual rounds: 2 free lists, 11 items and 17 photo requirements, each item naming what to look for and the photo that proves it. Work is commonly verified against IMC (mechanical code); the edition in force is the AHJ's call on each project.
The unit heater rounds
Unit heater QuarterlyUnit heater quarterly maintenance checklistFan operation, heat output, mounting and storage clearances checked on the unit heater6 items9 photosUnit heater AnnualUnit heater annual maintenance checklistHeat exchanger or coil, venting, motor bearings and the safety limits serviced on the annual pass5 items8 photos
Where each walk sits in the schedule
- Unit heater quarterly maintenance checklistquarterly
- Every quarter, with a pass just before the heating season so a dead unit heater is found before the space it serves freezes. Run by: The HVAC or facilities tech on the quarterly round through the warehouse and mechanical spaces.
- Unit heater annual maintenance checklistannual
- Once a year ahead of the heating season, so the burner, flue and safeties are proven before the units run unattended all winter. Run by: The HVAC service tech, with a gas fitter's combustion check on gas-fired units.
What most often fails on an unit heater
- 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.
- Gas heat exchanger cracked from years of thermal cycling and spilling combustion products into the space, never caught because it was only ever checked cold.
- Flue joints on a gas unit pulled apart or corroded at the draft hood, so products spill instead of venting, found only when someone smells it.
- Hydronic coil half-blocked with air or sludge and cutting output, blamed on an undersized unit instead of being purged and cleaned.
Verified against
Families only, never clause numbers. Adoption varies by jurisdiction; confirm the edition your authority having jurisdiction enforces before you run a walk against it.
Common questions
- Which unit heater maintenance rounds do these checklists cover?
- Unit heater quarterly maintenance checklist (quarterly): Every quarter, with a pass just before the heating season so a dead unit heater is found before the space it serves freezes. Unit heater annual maintenance checklist (annual): Once a year ahead of the heating season, so the burner, flue and safeties are proven before the units run unattended all winter.
- Who runs the unit heater maintenance round?
- The HVAC or facilities tech on the quarterly round through the warehouse and mechanical spaces. The HVAC service tech, with a gas fitter's combustion check on gas-fired units.
- What most often fails on an unit heater?
- 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. Gas heat exchanger cracked from years of thermal cycling and spilling combustion products into the space, never caught because it was only ever checked cold.
- Which standards is unit heater work verified against?
- IMC (mechanical code), published by the International Code Council. Adoption varies by jurisdiction. Confirm the edition your authority having jurisdiction enforces before you run a walk against it.
- Can I run these checklists in RTI?
- Yes. Start a free RTI workspace and load any of the 2 lists (11 items in total). The Photo Gate holds the submit button until every mandatory item is answered and its photos are attached, and approved inspections roll into a branded turnover package with a tamper-evident audit trail.