Boiler Repair, Replacement & Maintenance in Seattle
Radiator cold? Boiler losing pressure or making strange banging noises? Hydronic heating systems require precise, experienced hands, especially when Seattle's cold, damp weather sets in.
At Jim Dandy Sewer and Plumbing, we've been servicing and installing residential boilers across Seattle since 1908. Whether you need a quick repair to restore heat today, a tune-up to keep your system running efficiently, or a complete upgrade to a modern high-efficiency unit, our licensed team delivers fast diagnostic service with upfront pricing and zero surprises.
Signs Your Boiler Needs Attention
Boilers usually give clear warning signs before shutting down completely. If you notice any of these common issues, our licensed technicians can quickly diagnose the problem and get your system running smoothly again:
Active Leaks: Water pooling around the base from a faulty pressure relief valve, worn pump seal, or internal tank corrosion.
No Heat or Lukewarm Radiators: Cold spots caused by failed circulator pumps, faulty zone valves, or air trapped in the lines.
Dropping Water Pressure: System pressure falling below the standard operating range, signaling a hidden leak or expansion tank failure.
Loud System Noises: Banging, whistling, or "kettling" caused by mineral buildup on the heat exchanger or air pockets in the piping.
Uneven Heating: Radiators that are hot at the bottom but cold at the top due to trapped air or accumulated sediment.
Our Boiler Services
Whether you need a quick emergency fix on a freezing night or a planned upgrade to a high-efficiency system, we handle every aspect of residential hydronic heating.
Fast, Reliable Boiler Repair
When your boiler breaks down, you need accurate diagnostics, not guesswork. Our licensed technicians arrive fully equipped to troubleshoot circulator pumps, zone valves, pressure relief valves, expansion tanks, and control boards. We repair all major brands and models, providing clear, upfront pricing before any work begins so there are never any surprises.
Comprehensive Annual Boiler Maintenance
Routine maintenance is the best way to prevent sudden winter breakdowns, keep utility bills low, and extend the lifespan of your system. Our annual tune-up includes:
Cleaning and inspecting the burner, igniter, and heat exchanger.
Checking system pressure, expansion tank health, and relief valves.
Testing safety controls, thermostats, and zone operation.
Flushing sediment buildup and bleeding air from the radiator lines to ensure optimal heat flow.
Expert Boiler Replacement & Eco-Friendly Upgrades
If your boiler is over 15 to 20 years old, constantly breaking down, or driving up your gas bills, replacing it can save you significant money in the long run. We specialize in retrofitting older Seattle homes with modern, high-efficiency boilers and compact tankless combi-units that handle both home heating and domestic hot water. We carefully size your new unit to match your home's exact heating load, ensuring maximum comfort and energy savings.
Need Boiler Service in Seattle? Contact Jim Dandy Today
Don't let a faulty boiler leave your home in the cold. Whether you need an emergency repair, an annual safety tune-up, or a quote on a high-efficiency replacement, Jim Dandy Sewer and Plumbing is ready to help.
Frequently Asked Questions
Do you install, repair, and maintain hydronic baseboard heating systems as well?
Yes. We provide complete service for hydronic baseboard heating systems, including new installations, system retrofits, repairs, and annual maintenance. Whether you need to replace leaking fin-tube units, purge trapped air causing cold rooms, repair circulating pumps and zone valves, or install a brand-new baseboard layout connected to a modern boiler, our licensed technicians handle the entire system.
What is Jim Dandy's process for diagnosing boiler issues and providing quotes?
We keep our process straightforward and transparent from start to finish:
On-Site Diagnosis: A licensed technician inspects your system, evaluates pressure gauges, tests safety valves, and checks controls to pinpoint the exact issue.
Upfront Pricing: We provide a clear, upfront quote before any work begins, whether it is a routine repair or a complete system replacement, so there are never any surprise charges on your bill.
Detailed Proposals: For full boiler and baseboard replacements, we perform a detailed heat load calculation to size the new unit correctly and provide a written proposal outlining all equipment, labor, and permit costs.
Work Begins: Once you approve the estimate, we complete the work promptly or order equipment and secure permits to schedule your installation.
Does Jim Dandy handle all required City of Seattle mechanical permits for boiler replacements?
Yes. Replacing a boiler in Seattle requires specific mechanical and plumbing permits to ensure proper venting, gas line sizing, and safety code compliance. Jim Dandy manages the entire permitting process on your behalf, from submitting the initial application to scheduling and passing the final city inspection. You never have to worry about paperwork or city compliance.
