Same-Day Service
Most service calls handled same-day across Spokane and Coeur d'Alene.
Boiler Repair
Boilers fixed by techs who actually know boilers.
Boilers are less common than furnaces in the Inland Northwest, which means most HVAC companies aren’t truly set up to service them. We are. Our techs are trained on hot-water (hydronic) and steam boilers from Weil-McLain, Burnham, Lochinvar, Navien, Buderus, and the rest of the major brands.
From a single-zone leak to a multi-zone system that won’t fire, we diagnose, quote a flat-rate repair, and back it with a written warranty.
- Hydronic specialists Hot-water boilers, baseboard, in-floor radiant, and steam systems.
- Stocked trucks Circulators, expansion tanks, ignition modules, and zone valves on board.
- Flat-rate quotes Approved before any work — never charged by the hour.
- Warrantied work 1-year labor warranty plus full manufacturer parts coverage.
Symptom Check
Signs your boiler needs service
Boilers tend to fail slowly — small problems become floods or no-heat emergencies if ignored.
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Leaks or wet floor
Even slow leaks indicate failing seals, expansion tanks, or pressure-relief issues.
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Cold radiators
Air-locked zones, failed circulators, or stuck zone valves.
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Banging or kettling noise
Mineral scale buildup or air in the system — both shorten boiler life.
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Pressure problems
Pressure too high or too low usually points to expansion tank or fill valve issues.
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Won't ignite
Pilot light, ignition module, gas valve, or thermocouple — diagnosed in one visit.
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High gas bills
A boiler that's working harder than it should usually shows up on your bill before it shows up in comfort.
What We Repair
Every common boiler issue
Hot-water, steam, gas-fired, oil-fired, and high-efficiency condensing boilers — repaired by techs who know them.
- Circulator pumps Replace failed circulators that move hot water through the system.
- Zone valves Stuck or failed zone valves — common cause of "one zone won't heat".
- Expansion tanks Replace waterlogged tanks and fix repeating pressure-relief issues.
- Ignition & pilot Modern modules, hot-surface igniters, and standing-pilot thermocouples.
- Pressure relief & fill Failed PRVs, blocked fill valves, and overpressure problems.
- Aquastats & controls Replace failing temperature controls and outdoor-reset modules.
- Air-locked zones Bleed and rebalance hydronic zones that have lost circulation.
- Combustion safety check Combustion analysis and CO testing on every gas-fired boiler.
How It Works
Our 4-step boiler repair process
No mystery, no pressure. Here's exactly what to expect.
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Call & schedule
Speak to a real dispatcher 24/7. We confirm a time window and text a tech photo.
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Diagnose
Pressure, ignition, circulators, zones, and combustion — checked and reported.
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Approve the price
Flat-rate quote in writing. The diagnostic fee is applied to the repair.
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Fix & guarantee
Most repairs done same-day. 1-year labor warranty plus parts coverage.
Current Specials
Save on the work your home needs most.
Why Choose Mainstream
Upfront Pricing
Flat-rate pricing approved before work begins — no surprises on the invoice.
Licensed & Insured
Fully licensed in Washington and Idaho, bonded, and insured for your protection.
Satisfaction Guaranteed
If it isn't right, we make it right. Period.
Boiler trouble? We can help.
Same-day service across Spokane & Coeur d'Alene — flat-rate pricing, no surprises.
What Our Customers Say
Don't just take our word for it — hear from our satisfied customers
★★★★★
Ricky Saldana the technician that came out was fantastic. He was so knowledgeable about my plumbing issues and his recommendations were spot on. He was on time and very pleasant to work with. I would highly recommend him for any plumbing work that needs to be done.
Thanks Ricky for all of your input.
★★★★★
Jake was on time and very good about looking at my furnace. I appreciate all his help. I reccomend him and mainstream electric very highly. thank you Sharon Scott
Maintenance Membership
Join the Care Club
Total home service care, on a schedule.
Members get priority scheduling, seasonal HVAC tune-ups, an annual plumbing & electrical safety inspection, and exclusive discounts — for less than the cost of a single emergency call.
- Priority scheduling
- Seasonal HVAC tune-ups
- Annual safety inspection
- Exclusive member discounts
- Free dispatch on repairs
- No long-term contracts
Boiler Repair — Frequently Asked Questions
Why is my boiler losing pressure?
Most common cause is a leak somewhere in the system — a circulator seal, a baseboard fitting, or a relief valve that’s passed water. The second most common cause is a waterlogged expansion tank that no longer absorbs system pressure swings. Both are fixable in a single visit.
Why is one zone not heating?
Almost always a zone valve, an air-locked zone, or a failed circulator pump. We can usually pinpoint and fix the issue in a single visit — including bleeding the zone if it’s air-locked.
Should I repair or replace my boiler?
Modern condensing boilers run at 95%+ efficiency vs. 70–80% for older atmospheric boilers — the energy savings can pay back a replacement faster than you’d expect. If your boiler is over 15 years old and you’re facing a major repair, we’ll model the math both ways.
Do you service tankless / combi boilers?
Yes — including Navien, Rinnai, and Lochinvar combi boilers that handle both space heating and domestic hot water. These systems have unique service needs (descaling, flow sensors, plate heat exchangers) and not every company is set up for them.
Is the repair warrantied?
Every repair includes a 1-year Mainstream labor warranty plus the full manufacturer parts warranty. Care Club members get a 2-year extended labor warranty.
*Offers cannot be combined with other promotions or applied to dispatch fees. No cash value. Must present offer at time of service. Call for details.
