Boiler & Radiator Repair in Gaithersburg, MD
Many of Gaithersburg's older and historic homes are heated by a boiler and radiators rather than a furnace and ducts — and finding an HVAC company that genuinely understands hydronic heat is harder than it should be. P&Y Heating and Cooling repairs and services hot-water boilers, radiators, and baseboard systems that a lot of companies simply turn away.
Owner and master technician Pedro Alcantara has built a reputation for solving the complicated heating problems other contractors can't — including old hot-water boilers and radiator systems. When your boiler won't fire, a radiator stays cold, or the system is noisy and inefficient, we diagnose the real cause and fix it instead of pushing you toward a full system replacement you may not need.
Signs Your Boiler Needs Service
Boiler and radiator problems tend to start small and get worse through the winter. If you notice any of these, it's worth a diagnostic before a cold snap.
- Boiler won't fire or the pilot/ignition keeps going out
- Some radiators stay cold while others heat normally
- Banging, knocking, or gurgling sounds from pipes or radiators
- Low boiler pressure or you're constantly re-filling the system
- Water leaking around the boiler, valves, or radiator connections
- Uneven heat between floors or rooms
- A sudden jump in heating bills with no change in the weather
- The boiler short-cycles — firing and shutting off repeatedly
Our Boiler Repair Process
Hydronic systems reward a methodical diagnosis. We trace the problem through the whole loop instead of swapping the first part that looks suspect.
Inspect the whole system
We check the boiler, circulator pump, expansion tank, pressure, zone valves, and the radiators or baseboard loops — because a cold radiator often starts somewhere else in the system.
Diagnose the root cause
We test ignition and controls, look for air in the lines, trapped zones, circulator or valve failures, and pressure problems to isolate exactly what's keeping your home from heating.
Explain your options
You get a written scope and a straight answer on the repair — and if the boiler is near the end of its life, we show you the honest repair-versus-replace math.
Repair, bleed, and verify
After the approved repair we bleed the system, confirm correct pressure, and check that every radiator or zone heats evenly before we leave.
Why Boiler Expertise Is Hard to Find
As the industry shifted to forced-air furnaces and heat pumps, fewer technicians trained on hydronic systems. That leaves homeowners with boilers — especially in older Gaithersburg and Montgomery County homes — struggling to find someone who can actually diagnose radiator and hot-water heat. It's exactly the kind of work we're known for.
We handle the problems other companies pass on: zones that won't heat, persistent air in the lines, pressure that won't hold, and aging controls. If your system is still serviceable, we keep it running; if it's genuinely at the end, we tell you honestly and lay out the options.
Boilers, Radiators, and Adding Cooling
A boiler heats your home beautifully, but it can't cool it — and adding ductwork to a radiator home is expensive and invasive. The common solution is pairing your existing hydronic heat with a [ductless mini-split](/ductless-mini-split/) for efficient cooling and supplemental heat, which adds air conditioning without disturbing the boiler system you already rely on.
If you're preparing for winter, our guide to [getting your heating system ready](/blog/maryland-winter-heating-prep/) covers the seasonal checks that help a boiler run safely and efficiently through the cold months.
What Affects Boiler Repair Cost
Boiler repairs vary widely because the systems do. Common repairs generally run $200–$900, while major component work (a circulator pump, zone valve, or control board) can run higher. Here's what drives the price:
- The failed component — bleeding air or a thermostat issue is minor; a circulator pump, zone valve, or control board is more involved
- Boiler type and age — older cast-iron and steam systems can need specialized parts
- Whether the fix is a repair, a part replacement, or a system-wide air/pressure correction
- Accessibility of the boiler and the affected radiators or zones
- Standard-hours service versus after-hours emergency heat
Request Service
Fast response · No obligation · Upfront pricing
Why Homeowners Trust P&Y with Their Boiler
Hydronic heat is a specialty, and we treat it like one. Here's why homes with boilers call us.
Genuine hydronic experience
We diagnose and repair hot-water boilers, radiators, and baseboard systems — the complicated heating work many HVAC companies don't have the capacity to take on.
Repair before replace
A boiler is a major investment. We fix what's serviceable and only recommend replacement when the numbers genuinely favor it — never as a default.
Licensed and local
Maryland HVAC Master License #96254, based in Gaithersburg, and available 24/7 when your heat goes out in the middle of a cold snap.
Need Boiler & Radiator Repair in Gaithersburg?
Call P&Y for boiler & radiator repair — same-day appointments, honest written pricing, and licensed technicians across Montgomery County.
- 5.0★ (112+ reviews)
- MD License #96254
- Open 24 Hours
Free estimate · No pressure
Where We Provide Boiler & Radiator Repair
We service boilers and radiator systems throughout Montgomery County, with particular demand in the older housing stock around Rockville and historic neighborhoods where hydronic heat is common. Based in Gaithersburg, we respond quickly when a boiler goes down in winter.
We serve boiler & radiator repair across Gaithersburg and all of Montgomery County, including:
Boiler & Radiator Repair FAQs
Do you really repair boilers and radiators? Most HVAC companies don't.
Why is one of my radiators cold when the others are hot?
My boiler keeps losing pressure. Is that serious?
Should I repair or replace my old boiler?
Can I add air conditioning to a home with radiator heat?
Trusted by Your Neighbors
P&Y (Pedro) and his crew were absolutely outstanding. My unit was about 20 years old and giving problems. He was very responsive and made an appointment the same day. He not only told me the issue but gave me options — a repair price and a price on a new unit — even knowing the unit was 20 years old. Other companies just told me to change the unit. His crew spent almost 7 hours and tested it so it worked perfectly. Reasonable and great pricing than these big box companies.
Sandeep Visveswaran
Verified Google review
AC Installation
Great service and very honest. My parents had an HVAC issue where they called two different companies and both said to replace the whole unit. We decided to go for a 3rd opinion and contacted P&Y. It turned out to be a simple fix.
Mario Velarde
Verified Google review
AC Repair
Pedro found and repaired the problem with our AC that others had missed. He was prompt, professional and very pleasant to deal with. Very important to us was that the cost was reasonable AND that he concentrated on fixing the AC instead of trying to sell us a new one. I strongly recommend him.
Norma Neuberg
Verified Google review
AC Repair
Need Boiler & Radiator Repair in Gaithersburg?
Family-owned, licensed, and available 24/7. Call now for fast service and a free estimate across Montgomery County.
- 5.0★ (112+ reviews)
- Licensed & Insured
- 24/7 Emergency Service