Boiler Repair Across Wisconsin.
Boilers are not furnaces. Different physics, different parts, different failure modes. A lot of HVAC shops will work on one to keep the lights on. We actually know what we are doing with them, and we will tell you straight whether yours is worth fixing or worth replacing.
What We Fix
Every type of residential boiler.
We service hot water (hydronic) boilers, high-efficiency condensing boilers, and combi units that handle both heat and domestic hot water. Cast-iron systems from the 1960s, modern wall-hung units, in-floor radiant setups, the works.
Brands we work on regularly: Weil-McLain, Burnham, Lochinvar, Navien, Triangle Tube, Buderus, Peerless, Crown, Smith, Dunkirk, IBC, Slant/Fin, Utica. If it heats water, we can probably fix it.
Common failures we deal with most weeks: circulator pumps, zone valves, expansion tanks, fill valves, pressure relief valves, ignition components, flame rectification problems on condensing units, and airbound zones after a fill.
Why It Is Different
Boilers fail differently than furnaces.
A furnace either lights or it does not. A boiler can have heat, but the wrong zone. Or hot water at the tap but no heat in the radiators. Or pressure that creeps up and dumps out the relief valve every other day.
Diagnosing a boiler problem means understanding the whole hydronic loop, not just the appliance. Circulator pumps, zone valves, expansion tanks, air separators, auto-feed valves, pressure-reducing valves, anti-scald mixing valves. They all have to work together.
That is the part most general HVAC shops get wrong. They replace a part and the symptom comes back two weeks later because they fixed a symptom, not the cause. We take the time to find the actual cause.
Common Symptoms
If your boiler is doing any of this, call.
01
No heat in part of the house
Boiler is running, some zones are warm, others are cold. Usually a stuck zone valve or a failed circulator pump for that loop. Sometimes airbound piping after a recent repair or fill.
02
Pressure keeps dropping
You see the boiler pressure gauge below 12 PSI when it should sit around 15. There is a leak somewhere in the system, the expansion tank may be failed, or the auto-fill valve is not doing its job.
03
Pressure keeps climbing
Gauge creeping toward 30, relief valve dumping water on the floor. Failed expansion tank is the usual answer. Sometimes a leaking domestic coil if it is a tankless coil setup.
04
Banging or knocking in the pipes
Water hammer or kettling. Could be trapped air, an undersized expansion tank, scale buildup in the heat exchanger, or a circulator pump on its way out. Worth diagnosing before it gets worse.
05
Combi boiler hot water lukewarm
Heat works fine but the shower is barely warm. Usually a scaled or fouled secondary heat exchanger, which is common on units more than 8 years old. We can flush it or replace it.
06
Error code on the front panel
Modern boilers tell you what is wrong if you know how to read them. F09, E10, A01, every brand uses different codes. Tell us the code when you call and we will arrive with the right part already pulled.
How It Works
From your call to a warm house.
Call (414) 507-1789
We get the boiler details (brand, model, approximate age, error code if any) on the phone, then give you an arrival window. For known brands with common error codes we can often pull the part before we leave the shop.
We diagnose the whole system
Not just the appliance. Pressure check, expansion tank verification, zone-by-zone flow test, combustion analysis on gas units, pressure relief valve check. The whole loop.
You see the price, we do the work
Fixed price for the repair before we start. If we found a second issue during diagnosis, we tell you what it is and what it would cost to address now versus later. Your call.
We test through a full cycle
Boiler fires, reaches setpoint, satisfies the call, shuts down clean. Pressure stable. No leaks. We verify combustion is dialed in on condensing units. Then we are out.
Pricing
What boiler repair actually costs in Wisconsin.
Boiler repairs cover a wider range than furnace repairs because the systems vary more. A simple circulator pump swap is straightforward. A heat exchanger replacement on a high-efficiency condensing boiler is a much bigger job.
These are typical ranges we see across the Oconomowoc area. Your fixed quote will be more precise once we see the actual unit. Parts availability matters too. Stocked brands like Weil-McLain and Lochinvar usually mean same-day or next-day fixes. Some boutique European brands can take a week to source parts for.
Typical Repair Ranges
Every repair gets a fixed price before we start. Final cost depends on the part, the brand, and parts availability. We tell you the number before any work begins.
Local Service
We cover all of Wisconsin for boiler work.
For boiler repair we range further than we do for furnaces and AC. There are fewer shops that genuinely know hydronic work, so we are happy to drive. Madison, Milwaukee, Janesville, Beloit, the Fox Valley, Sheboygan, anywhere in the southern half of the state.
If you are further out and need help, call. We will tell you straight whether it makes sense for us to make the trip or whether you would be better served by someone closer. We are not here to waste your time.
Why It Matters
A failed boiler in February is a real emergency.
Hydronic systems have water sitting in pipes and radiators throughout your house. When the heat stops in cold weather, you do not just lose comfort. You can lose the plumbing.
Frozen baseboard, split radiator valves, burst PEX in a slab. We have seen all of it. If your boiler quits and outdoor temperatures are below freezing, treat it as an emergency. Open the cabinet doors under sinks, let faucets drip, and call us right away.
Common Questions
Boiler repair, answered straight.
How much does boiler repair cost in Wisconsin?
Most residential boiler repairs run $200 to $1,200. Circulator pumps, expansion tanks, and ignition components are on the low end. Heat exchanger failures and zone valve replacements run higher. Combi boilers tend to cost more to repair than traditional cast-iron units because the parts are more proprietary.
How long should a residential boiler last?
Cast-iron boilers commonly last 25 to 30 years with maintenance. High-efficiency condensing boilers and combi units typically last 12 to 18 years because of the stress on the secondary heat exchanger. We can tell you where your unit is in its life when we look at it.
What brands of boilers do you service?
Weil-McLain, Burnham, Lochinvar, Navien, Triangle Tube, Buderus, Peerless, Crown, Smith, Dunkirk, IBC, Slant/Fin, Utica. Both residential and light commercial.
My boiler keeps losing pressure. What is wrong?
Three usual causes: a small leak somewhere in the system (often a hidden radiator or baseboard fitting), a failed expansion tank that lets pressure relief through the boiler's PRV, or a bad auto-feed valve. We can pressure-test the loop and find the cause in one visit.
Is annual boiler maintenance worth it?
For high-efficiency condensing and combi boilers, absolutely. They run with tighter tolerances and the heat exchangers are more sensitive to scale and combustion fouling. Annual service catches problems before they turn into $1,500 repairs. For old cast-iron units, every two or three years is fine.
Should I replace my boiler with a high-efficiency model?
Sometimes. High-efficiency boilers can hit 95%+ AFUE versus 80-82% on a standard unit. The savings on a Wisconsin heating bill are real. But the upfront cost is higher and the unit's lifespan is shorter, so the math is not automatic. We can run actual numbers for your house if you are weighing it.
My combi boiler heats the house fine but the shower is barely warm. Why?
Almost always a scaled or partially blocked secondary heat exchanger. Wisconsin water is fairly hard, and the secondary heat exchanger in a combi unit is exposed to fresh water every time you turn on a tap. We can descale it (cheaper, buys you some years) or replace it (more expensive, fresh start).
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