5 things to DIY every fall (~60 min)
1. Visual inspection
Walk around the boiler. Water on floor, rust streaks, soot, frayed wires, dust. Note anything unusual — write it down for the tech.
2. Pressure check
Cold gauge reads 12-15 PSI. Top up via fill valve if low. Note if it dropped from last fall (may indicate slow leak).
3. Test heat call
Thermostat up 5°F. Boiler fires within 30 seconds. Run 10-15 min. Listen for unusual sounds. Verify all zones heat.
4. Bleed radiators (if applicable)
10 min per radiator. See step-by-step guide.
5. Replace thermostat batteries
Even if not warning. Dead batteries in January cause a lot of "boiler not working" calls.
Total DIY: ~60 min. Cost: $0 (or $4 for a radiator key).
4 things that need a tech (~90 min, $269-$329)
1. Combustion analysis
O2, CO, stack temp with calibrated analyzer. Verifies safe and efficient burn. Can't be eyeballed. Drift over time is normal — gets adjusted.
Why it matters: incomplete combustion produces CO (deadly). Drift wastes gas. Annual analysis is the only way to catch it.
2. Flame rod / igniter inspection
Mod-cons especially. Flame rod fouls with combustion deposits over years. Igniter wears out. Cleaning vs replacing is condition-based.
Why it matters: failed flame rod = boiler lockout (no heat). Failed igniter = no startup. Both happen at 6 AM in January if not addressed.
3. Heat exchanger inspection
Visual check for scale, corrosion, leaks. Catches issues 1-2 years before emergencies. Requires opening boiler cabinet (sometimes combustion chamber).
Why it matters: HX is the most expensive component. Catching scale early adds years of life.
4. Gas pressure verification
Manometer check of inlet and manifold pressures vs manufacturer spec. Wrong gas pressure causes drift, lockouts, premature wear.
Why it matters: gas company occasionally changes line pressures. Your boiler doesn't know — just runs slightly off-spec.
What happens if you skip pro maintenance?
Skip 1 year: probably nothing. Boiler runs another winter on accumulated drift.
Skip 2-3 years: 30-50% chance of mid-winter no-heat call. Drift accumulates. Small issues compound.
Skip 5+ years: high chance of major repair ($800-$2,500) or premature replacement ($9,500-$14,500). Boiler reaches end of expected life 3-5 years early.
Pure math: $269/year × 15 years = $4,035. Replacement avoided: $14,500. ROI: 359%.
Maintenance and warranty implications
Most boiler manufacturers (Lochinvar, Navien, Triangle Tube, Weil-McLain) require documented annual maintenance to honor extended warranties. Skip a year, you may forfeit warranty coverage on major components.
We document every service call in writing. Keep these records. If a warranty claim arises, the maintenance documentation is what makes it valid.