Quick answerAnnual boiler maintenance in Spokane covers cleaning the burner and flue passages, a combustion test for carbon monoxide and efficiency, checking system pressure and the expansion tank charge, testing the relief valve and low-water cutoff, inspecting circulators and zone valves, and bleeding air from the loop. A typical visit takes one to two hours.
Updated September 2026
Why a boiler needs its own service
A boiler works differently from a furnace. It heats water, not air, and it depends on correct pressure, a charged expansion tank and working safety controls to operate safely. Over a season, the burner collects dust and soot, the tank slowly loses its air charge, and relief valves that sit untouched can seize.
Condensing boilers add their own list: the condensate trap and neutralizer, the heat exchanger that can clog with scale or debris, and the plastic venting. We service both old cast-iron boilers and modern wall-hung units.
The core of a boiler service
Annual boiler service
We shut the boiler down, open the combustion chamber, and brush or vacuum the burner and flue passages. On condensing boilers we inspect the heat exchanger, clean the condensate trap and check the neutralizer. We check the gas pressure, the ignition system and the flame, then run a combustion analysis to confirm carbon monoxide and efficiency are where they should be. Venting gets a visual check from the boiler to the outside, including chimney connections on older units and plastic pipe joints on newer ones.
Expansion tank and relief valve checks
The expansion tank absorbs the water's growth as it heats. When it loses its air charge or its bladder fails, pressure spikes each cycle and the relief valve starts to drip. We isolate and check the tank's air charge, recharge or replace it, and set the system fill pressure for the height of the house. The relief valve is inspected and tested where safe; a valve that weeps or will not reseat is replaced. These two parts cause most of the pressure problems we see on service calls.
Low-water cutoff testing
A low-water cutoff shuts the burner down if the water level drops, which protects the boiler from firing dry, a failure that can crack a cast-iron section. Steam boilers depend on it every day, and many hot water boilers have one too. We test it by the manufacturer's method, flush float-type cutoffs where required, and confirm the burner actually stops. On steam systems we also check the sight glass, the pressure control and the main vents.
What every boiler service includes
How a boiler service visit runs
- 1
Ask about the last season
Cold rooms, noises, pressure changes.
- 2
Shut down safely
Gas, power and water isolated as needed.
- 3
Clean
Burner, flue passages and condensate trap.
- 4
Check pressure
Fill pressure, expansion tank charge, relief valve.
- 5
Test safeties
Low-water cutoff, limits and ignition.
- 6
Combustion test
CO and efficiency measured.
- 7
Purge and verify
Air bled, every zone heated before we leave.
Getting ready for a long Spokane heating season
In Spokane a boiler may run from September into May, which is a long season for any pump, valve or tank to go unchecked. Many older homes in the city still heat with original hydronic systems, and those boilers tend to fail at the start of the season when they are asked to work hard after a summer of rest. A service visit in late summer or early fall is the simplest way to avoid a no-heat call in the first cold week.
What affects the cost of boiler service
What you can watch between visits
| Homeowner | Technician | |
|---|---|---|
| Pressure gauge | Note the reading when cold and hot | Adjust fill pressure and tank charge |
| Radiators | Bleed air from high radiators | Purge air from the whole loop |
| Relief valve | Report any dripping | Test and replace the valve |
| Around the boiler | Keep storage clear | Inspect venting and combustion air |
Boiler maintenance questions
How often should a boiler be serviced?
Once a year, ideally in late summer or early fall.
What pressure should my boiler show?
Most homes run around 12 to 15 psi cold. Much higher or falling pressure needs service.
Why does my relief valve drip?
Usually high pressure from a failed expansion tank, or a worn valve.
Do steam boilers need different service?
Yes. Steam systems need sight glass, low-water cutoff and vent checks.
Does maintenance affect my warranty?
Many manufacturers require annual professional service to keep coverage.
Other furnaces, boilers & electric heat services we handle
Manufactured Home Furnace and AC Service
Answered 24/7, parts on the truck.
Manufactured Home Furnace and AC Service detailsFurnace Replacement
Sized, quoted and permitted.
Furnace Replacement in SpokaneElectric Baseboard and Wall Heater Repair
Answered 24/7, parts on the truck.
How we handle electric baseboard and wall heater repairService the boiler before it gets busy.
Call to book boiler maintenance in Spokane, WA.
