
Boiler Service
BOILER REPAIR, MAINTENANCE & REPLACEMENT IN NORTH LOUISIANA
Have a hot-water or steam boiler? We repair, service, and replace them across North Louisiana — pressure, circulator, and safety-control work, flat-rate before we start.
4.9 · 3,569 reviews (2 profiles)
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4.9★ on Google
3,569 reviews · 2 profiles
24/7 Emergency
Call for current availability
Licensed & insured
LA Master Plumber #1874
North Louisiana
Ruston to Monroe
Flat-rate pricing
Quoted before we start
Overview
Straight Talk About Boilers in North Louisiana
Boilers are less common in North Louisiana than furnaces and heat pumps — our mild winters mean most homes here were built with forced-air heat. But plenty of older homes, custom builds, and radiant-heat systems around Ruston, Monroe, and West Monroe run on a hot-water or steam boiler, and when one goes down, you need a licensed crew that actually knows the equipment. That's us.
Mark Johnson & Sons repairs, maintains, and replaces residential boilers. Because we're a combined plumbing and heating company, boiler work sits right in our wheelhouse — it's as much about water, pressure, and piping as it is about heat. The tech who shows up is on our payroll, no subcontractors, and every quote is flat-rate, given before any work starts. The service call is waived when you have us do the repair.
What we service
- Hot-water (hydronic) boilers — gas and electric, cast-iron and condensing, feeding radiators, baseboard, or radiant-floor loops
- Steam boilers — the older systems still found in some North Louisiana homes
- Circulation and pressure components — circulator pumps, expansion tanks, air separators, fill and pressure-reducing valves
- Controls and safeties — aquastats, relief valves, low-water cutoffs, gas valves, and ignition controls
Repair vs. replace
If the boiler is under 15 years old and the repair is reasonable relative to a new unit, repair usually makes sense — circulators, expansion tanks, and controls are routine, affordable fixes. Once you're facing a cracked heat exchanger, a badly corroded block, or repeated failures on a 20-plus-year-old unit, replacement is the smarter money. We'll tell you honestly which side of that line you're on and quote both flat-rate.
What Mark Johnson & Sons does differently
Most heating companies around here won't touch a boiler because they don't understand the water side. We do. We chase pressure problems to the actual source instead of just topping off the fill valve, bleed trapped air so every zone heats, and verify the safety controls cycle correctly before we leave. Because boilers are rare locally, parts sometimes have to be ordered — but we carry common circulators, expansion tanks, and controls and get you heat back as fast as anyone can. On a replacement we handle the near-boiler piping, the permit, and old-unit removal in-house, so you deal with one crew from start to finish.
Ask about our service savings agreement plans — it includes a seasonal heating tune-up tailored to your boiler plus 15% off any repair, which is the cheapest way to keep a boiler reliable and safe.
Free quote
Flat-rate boiler quote
Tell us the boiler type, its age, and what it's doing. We'll come diagnose it and give you a real number before any work starts.
4.9★
24/7
Emergency
Free
Quote
Current coupons
View all$89 OFF
Waived diagnostic with any boiler repair
Service call credited back when you approve the repair.
Expires 12/31/2026
15% OFF
Repairs with service savings agreement
Memberships start at $189/year. Discount applies to HVAC & plumbing repairs.
Expires 12/31/2026
$400 OFF
New boiler installation
Qualifying boiler replacement. Must mention at booking.
Expires 12/31/2026
Mention coupon when booking. One offer per household.
Warning signs
Signs Your Boiler Needs Attention
Boilers usually give warning before they fail outright. If you're seeing any of these, get it checked before a cold snap.
No heat or weak heat to the radiators or floor loops
System pressure gauge reading too low or climbing too high
Banging, knocking, or gurgling sounds when the boiler fires
Water pooling or dripping around the boiler or piping
Circulator pump humming but not moving water
Pilot or burner won't stay lit, or the unit keeps locking out
Cold radiators or rooms that used to heat evenly (trapped air)
Relief valve weeping or discharging water
Boiler is 15+ years old with rising repair frequency

Licensed & local
Got a boiler? We're the plumbing-and-heating crew that knows them.
Boilers are rarer in North Louisiana, so most companies won't touch them. We do — pressure, circulator, expansion tank, and safety controls, all in-house, flat-rate.
Answered live
24/7
Across Ruston, Monroe, West Monroe, and North Louisiana.
The Process
How a Boiler Service Call Goes

On the truck
Professional tools, parts, and diagnostics — every call.
On-phone triage
We ask what type of boiler you have, its age, and what it's doing — no heat, a leak, odd noises, or a lockout. If there's active leaking, we roll sooner.
Full diagnostic on-site
The tech checks system pressure, the circulator pump, expansion tank, relief valve, low-water cutoff, and safety controls, then walks you through what's wrong.
Flat-rate quote
You get the repair price up front. If the boiler is a replacement candidate, we lay out honest options and real numbers before you decide anything.
Repair or service the system
Common parts — circulators, expansion tanks, relief valves, controls — we source and install. We bleed trapped air and reset pressure so the loop runs right.
Test, verify, and clean up
We fire the boiler, confirm even heat across the loop, verify the safety controls cycle correctly, and leave the equipment room clean.
Pricing
How We Price Boiler Repair & Service
Flat-rate, quoted before we start. Service members get 15% off repairs. After-hours emergency service is billed separately.
Flat rate, quoted before we start
You get the full price for the job up front — not an hourly meter you watch climb. You approve it before a tool comes out of the truck.
The quote is the price
It doesn't move once work begins. If something unexpected turns up behind a wall or under a slab, we stop and talk it through with you before going further.
Service members save 15% on every repair
Service savings agreements start at $189 a year and take 15% off all plumbing, heating, and cooling repairs, with priority scheduling on every call. The Premium Service Savings Agreement Plan adds same-day service and drops after-hours charges entirely.
Financing available
Bigger jobs — a system replacement, a repipe, a sewer line — can be financed through GoodLeap. Apply online in a few minutes.
Every job is priced for your home and what it actually needs — tell us what's going on and we'll get you a firm number, free and with no obligation.
Service Savings Agreement Plans
Two plans. Whole-home peace of mind.
From $189 a year, service members get 15% off every plumbing, heating, and cooling repair, two complete HVAC tune-ups, a free plumbing and drain check-up, and priority scheduling on every call.
- 15% off repairs
- Priority scheduling
- 2 HVAC tune-ups/yr
- After-hours discounts
- $25 savings certificate
- Guaranteed flat-rate
Service Savings Agreement Plan
$189/year
Everything it takes to keep the house maintained and your repairs discounted.
Each additional HVAC unit is $89/year
Premium Service Savings Agreement Plan
$389/year
Everything in the Service Savings Agreement Plan, plus no after-hours charges, no travel fees, and same-day service.
Each additional HVAC unit is $89/year
Questions? (318) 319-0220
1-year term · does not auto-renew
Compare
Boiler (Hydronic) vs. Forced-Air Furnace
The two ways to heat a home with gas. Most North Louisiana homes use forced air, but a boiler delivers a different kind of comfort — here's how they compare so you know what you have and what fits.
| Feature | Boiler (Hydronic) | Forced-Air Furnace |
|---|---|---|
| How it heats | Hot water through radiators or floor loops | Heated air blown through ducts |
| Comfort feel | Even, quiet, draft-free warmth | Fast warm-up, some drafts and noise |
| Air quality | No blown dust or allergens | Filters air, can stir up pollen |
| Cooling | None — needs a separate AC system | Shares ductwork with central AC |
| Best for | Radiant homes, even-heat comfort, no ducts | Most LA homes, pairs with AC, lower cost |
FAQ
Boiler Service FAQs
Do many homes in North Louisiana have boilers?
No — forced-air furnaces and heat pumps are far more common here because of our mild winters. But older homes, custom builds, and radiant-floor systems around Ruston, Monroe, and West Monroe do run on boilers. We're one of the few local crews that service them, since boiler work is as much plumbing as it is heating.
Why is my boiler losing pressure?
The most common causes are a leak somewhere in the loop, a waterlogged or failed expansion tank, or a relief valve that's weeping. Low pressure means the system can't push hot water to every radiator or floor zone. We find the source, fix it, and reset the pressure correctly — chasing it with the fill valve alone just hides the real problem.
What's that banging noise when my boiler runs?
Banging or knocking (sometimes called kettling) usually means trapped air in the loop, low water flow from a weak circulator, or scale buildup on the heat exchanger. It's worth addressing — the noise is a symptom of the system working harder than it should. We diagnose the cause instead of just turning the boiler down.
Should I repair or replace my boiler?
If the boiler is under 15 years old and the repair is reasonable relative to replacement cost, repair usually makes sense. Cracked heat exchangers, repeated failures, or badly corroded units are typically better replaced. We'll give you honest math and a flat-rate quote either way — no pressure to buy new.
How much does a new boiler cost installed in North Louisiana?
A residential boiler replacement is quoted flat-rate once we've looked at the system. What drives it is size, whether you go standard or high-efficiency condensing, and how much near-boiler piping has to be redone. The permit is included. We show you the options and real numbers before you commit.
How often should a boiler be serviced?
Once a year, ideally before winter. An annual service checks pressure, the circulator, expansion tank, relief valve, and safety controls, bleeds trapped air, and catches small problems before they become no-heat calls. Regular service is the cheapest way to keep a boiler reliable and safe.
What's the difference between a boiler and a furnace?
A boiler heats water and moves it through radiators or in-floor loops for even, draft-free warmth; a furnace heats air and blows it through ductwork. Boilers don't provide cooling, so a boiler home needs a separate AC system, while a furnace shares its ducts with central air. If you're deciding between them on a replacement, we'll walk you through the trade-offs for your house.
Can you get to a no-heat boiler fast?
Yes. We answer live 24/7 and dispatch for no-heat and active-leak calls, typically on-site in 60 to 90 minutes for emergencies during a cold snap. Same-day is standard in business hours. An after-hours surcharge applies on top of the repair.
Do you need a permit to replace a boiler?
Yes — boiler replacement involves gas, water, and venting, so Louisiana cities require a permit and a licensed installer, and it's inspected. We pull the permit, do the near-boiler piping to code, and bake the fee into the flat-rate quote. DIY or unpermitted work gets flagged on home-sale inspections and can void insurance.
Is boiler service included in the service savings agreement?
The $189/year Service Savings Agreement Plan includes two HVAC tune-ups and an annual plumbing check-up, plus 15% off repairs and priority scheduling. For boiler-heated homes we tailor the heating tune-up to your system, and the 15% repair discount applies to boiler work — ask us and we'll set it up right for your equipment.
Do you offer financing on a new boiler?
Yes. Financing is available on boiler replacements so you don't have to cover the whole cost up front. We'll lay out the plans and monthly payments next to your flat-rate quote so you can weigh repair versus replacement with the full picture.
Related services
Related Heating Services
These often come up alongside boiler work.

Radiant Heating
In-floor and radiant heating service and installation — the loops many boilers actually feed.

Furnace Repair
No-heat calls, short cycling, ignition and blower faults — gas and electric furnaces, fixed fast.

24/7 Emergency Heating
No heat on the coldest night? Licensed tech dispatched fast, any hour, any day.
Available Around the Clock
Emergency?
We answer 24/7.
Burst pipe, water heater out, sewer backup? Real plumbers pick up — no answering machines. Mark Johnson & Sons Plumbing serves North Louisiana any time, day or night.
LA Master Plumbing #1874 · Backflow Cert #28131 · Master Natural Gas Fitter #LMNGF9062 · State Contractors #35794