Boiler Repair & Installation in Seattle
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When your boiler stops keeping up, a cold house is never far behind. Greenwood Heating and Home Services repairs, replaces, and maintains boilers for homeowners across Seattle and King and Snohomish counties. Whether you have a decades-old boiler feeding cast iron radiators or a modern high-efficiency system, our certified technicians will keep your home warm all winter.
We specialize in hot water (hydronic) boilers and radiant floor heating systems; we don't service steam boilers
What Is a Boiler?
A boiler heats your home with hot water instead of hot air. It heats water and circulates it through a closed loop of pipes to radiators, baseboard heaters, or radiant floor tubing, which then release warmth into each room. The water cools as it travels, returns to the boiler, and the cycle starts again.
That's the main difference between a boiler and a furnace: a furnace heats air and blows it through ductwork, while a boiler heats water and moves it through pipes. Many Seattle homes, especially older Craftsman and early-1900s houses, were built with boiler and radiator systems, and boilers remain a quiet, comfortable way to heat a home without ducts.
A boiler is not the same as a water heater. Your boiler warms your home; your water heater supplies the hot water for your showers and sinks. Some systems do both, which we cover below.
Our Boiler Services
Boiler Repair
No heat, cold radiators, or a boiler that keeps shutting off? Our technicians diagnose the problem, explain your options with upfront pricing, and get your heat back on as quickly as possible. We repair igniters and burners, circulator pumps, pressure relief valves, expansion tanks, thermostats and controls, and leaks in the boiler or piping. Emergency service is available 24/7.
Boiler Installation & Replacement
When it's time for a new boiler, we'll assess your home, your existing radiators or radiant system, and your hot water needs to recommend the right type and size. We remove and haul away your old unit, install the new boiler, and test the full system before we leave. Upgrading an older boiler to a high-efficiency model can lower your heating bills for years to come.
Boiler Maintenance
An annual tune-up keeps your boiler running safely and efficiently and helps catch small problems before they turn into a mid-winter breakdown. A typical maintenance visit includes:
- Checking system pressure and the expansion tank
- Inspecting the burner, igniter, and heat exchanger
- Testing safety controls, including the pressure relief valve
- Checking venting and testing for carbon monoxide
- Bleeding air from radiators and checking for leaks
Signs Your Boiler Needs Repair
- No heat or not enough heat: Radiators stay cold or lukewarm, or some rooms never warm up.
- Strange noises: Banging, gurgling, or kettle-like rumbling can indicate trapped air, mineral buildup, or a failing pump.
- Leaks or drips: Water around the boiler or under radiators may indicate that a valve, fitting, or the boiler itself is failing.
- Pressure problems: A pressure gauge that keeps dropping, or a relief valve that keeps releasing water, needs attention.
- Frequent shutoffs or pilot problems: A boiler that cycles off or won't stay lit often has an ignition or control issue.
- Rising heating bills: An aging boiler has to work harder to deliver the same comfort.
If you ever smell gas or your carbon monoxide alarm goes off, leave your home and call your gas utility or 911 first, then call us.
Should You Repair or Replace Your Boiler?
A repair usually makes sense when the boiler itself is in good shape, and a single part has failed, such as a pump, igniter, or valve. Replacement is often the smarter investment when:
- Your boiler is getting older and needs repairs more than once a season
- Repair costs are adding up compared to the cost of a new system
- Your heating bills keep climbing
- The boiler itself, not just a part, is leaking or corroded
Our technicians will give you an honest assessment of both options, with upfront pricing, so you can make the right choice for your home and budget.
Types of Boilers We Install
Conventional Boilers
Traditional boilers that heat water for your radiators or baseboards. They're a dependable, familiar option and are often the most straightforward replacement for an older boiler.
High-Efficiency Condensing Boilers
Condensing boilers capture extra heat from their exhaust gases that a conventional boiler would send up the flue. That means more of the fuel you pay for goes into heating your home, and lower monthly bills.
Combi Boilers
A combination (combi) boiler heats your home and supplies on-demand hot water for your taps and showers, all from one compact wall-mounted unit. Combi boilers can free up space by replacing both a boiler and a separate water heater.
Indirect Water Heaters
An indirect water heater is a storage tank heated by your boiler rather than its own burner. If you already have a boiler, it can be an efficient way to supply hot water to your home.
Frequently Asked Questions About Boilers in Seattle
What's the difference between a boiler and a furnace?
A boiler heats water and circulates it through pipes to radiators, baseboards, or radiant floors. A furnace heats air and blows it through ducts. Both heat your home; they just use different methods.
How much does it cost to replace a boiler in Seattle?
The price depends on the type and size of boiler, your existing piping and radiators, venting needs, and how easy the installation space is to reach. Contact us for a free, upfront estimate.
Does my boiler need annual maintenance?
Yes. A yearly tune-up helps your boiler run safely and efficiently, catches small problems early, and is often required to keep your manufacturer's warranty valid.
Why does my boiler keep losing pressure?
Common causes include a leak in the system, a faulty pressure relief valve, or a problem with the expansion tank. Because low pressure can shut your boiler down, it's worth having a technician find the cause.
Can I replace my boiler with a heat pump?
Yes. Greenwood offers boiler-to-heat-pump conversions. Depending on your home's layout, options include ductless mini splits or other heat pump systems. Our comfort advisors can walk you through what fits your home.
Do you offer emergency boiler repair?
Yes. We offer 24/7 emergency boiler service, and Club Members get priority scheduling.
Keep Your Boiler Running Longer
A boiler that's looked after every year can outlast one that's ignored. Our Club Membership makes it simple:
- Boiler Service Included: Boiler service is part of your membership, and members get priority scheduling.
- Member Pricing: Save up to 25% on repairs and up to 5% on new equipment.
- Never Miss a Tune-Up: We'll send a yearly reminder by text, email or phone, whichever you prefer.
Boiler Financing in Seattle
A new boiler is a big investment. Through our partnership with GreenSky, you can spread the cost over time. The application takes just minutes and uses a soft credit check, so applying won't affect your credit score.
Why Seattle Homeowners Choose Greenwood
- Over a Century in Seattle: We've been caring for local homes since 1918.
- Locally Owned & Operated: Our decisions are made here, guided by our Core Values and backed by some of the strongest warranties in the industry.
- Upfront Pricing: No surprise bills. You'll know the price before any work begins.
Need boiler repair, replacement, or maintenance in Seattle? Schedule your service today or call 206-207-4734.
IBC Boilers
IBC builds high-efficiency, wall-mounted condensing boilers that run on natural gas or propane. Its SL Series boilers modulate their firing rate to match your home's heating needs, and its DC Series combi boilers heat your home and deliver on-demand hot water from one compact unit.
IBC SL 10-85G3
IBC SL 14-115G3
IBC SL 20-160G3
IBC SL 30-199G3
IBC DC 20-125
IBC DC 33-160
Viessmann Boilers
Viessmann's Vitodens wall-mounted condensing boilers use a stainless steel Inox-Radial heat exchanger built by Viessmann and carry a limited lifetime warranty in residential applications. The Vitodens 100-W comes in heat-only and combi versions, and the Vitodens 200-W is Viessmann's premium wall-mounted boiler with a 7-inch color touchscreen control.
Viessmann Vitodens 100-W, B1HE
Viessmann Vitodens 200-W, B2HE
Viessmann Vitodens 100-W, B1KE
Ready to Get Started?
Whether it's an emergency repair or routine maintenance, we're here to help. Book online or give us a call — your comfort is our priority.
