Free checklist
Tankless water heater quarterly maintenance checklist
A quarterly tankless water 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 IPC / UPC plumbing codes, manufacturer's published instructions. Confirm the edition your authority having jurisdiction has adopted.
- Items
- 7
- Photos required
- 9
- Built for
- Subcontractors
Who runs it
The plumbing or maintenance tech on the quarterly mechanical round.
When in the schedule
Every quarter, since a tankless unit gives no warning before it starts short of temperature or throws a fault mid-shift.
The checklist
Every item, and the photo that proves it
The photo count on each row is what RTI would require before the item can be submitted. Copy the list as is, or load it into RTI and let the gate enforce it.
Water side
- 2 photos
Inlet filter screen removed, cleaned and reseated
Cold inlet screen pulled, flushed of grit and scale, reinstalled and confirmed not restricting flow into the heat exchanger.
- 1 photo
Delivered temperature verified at a fixture
Actual temperature measured at a representative fixture, compared against the setpoint, checked that a hot draw holds temperature and doesn't run cold-hot-cold.
- 1 photo
Unit and connections checked for leaks
No weeping at inlet/outlet unions, isolation valves or the relief line, no mineral trails on the case pointing to a slow internal leak.
Combustion and venting
- 2 photos
Venting and condensate drain checked on condensing units
Vent run intact and sloped, terminal clear, condensate trap primed and neutralizer (where fitted) draining freely, not backing up into the unit.
- 1 photo
Burner flame and ignition observed
Clean ignition on demand, steady flame with no rollout or sooting, unit modulating smoothly rather than hunting.
Supply and diagnostics
- 1 photo
Gas or electric supply confirmed adequate
Gas pressure holding under full fire, or electrical connections tight and undamaged on electric units, no scorching at the supply terminals.
- 1 photo
Error and fault history read off the controller
Stored fault codes reviewed and logged, recurring ignition, flow or scale faults noted as a trend rather than cleared and forgotten.
What usually sends this back
The failures are almost always the evidence, not the work
- Inlet filter screen never pulled, so it clogs with debris and the unit modulates down or faults on low flow, read as a failing heater.
- Delivered temperature judged at the unit's display instead of a fixture, so the drop across a long run to the far tap goes unnoticed.
- Error and fault history never read off the controller, so a unit clearing repeated ignition or scale faults on its own is treated as healthy.
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 9 required photos exist. Approved walks roll into a branded turnover package with a tamper-evident record behind every line.
Submission state
The gate is enforced on the server, so it holds even if the phone is offline when the walk happens.
Verified against
Common questions
- What does this tankless water heater quarterly checklist cover?
- 7 items across 3 sections, covering water side, combustion and venting, supply and diagnostics. 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 plumbing or maintenance tech on the quarterly mechanical round.
- When in the schedule should this walk happen?
- Every quarter, since a tankless unit gives no warning before it starts short of temperature or throws a fault mid-shift.
- Why does every item ask for a photo?
- 9 of the 7 items call for photo evidence. 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 a tankless water heater quarterly inspection?
- Inlet filter screen never pulled, so it clogs with debris and the unit modulates down or faults on low flow, read as a failing heater. Delivered temperature judged at the unit's display instead of a fixture, so the drop across a long run to the far tap goes unnoticed. Error and fault history never read off the controller, so a unit clearing repeated ignition or scale faults on its own is treated as healthy.
- 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.
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