01
Emergency Boiler Repair
No-heat emergencies and boilers that quit without warning, handled with urgency.
Learn more →Fifteen services, one trade. Every page below is boiler work a Delaware homeowner or business actually orders.
Boilers are all we do, so this list is short on purpose. Each service below is a job a Delaware homeowner or business actually orders, with its own page explaining when it fits, how it works, and what to expect. Nothing here is a method dressed up as a service: the tools and techniques stay inside the pages where they belong.
01
No-heat emergencies and boilers that quit without warning, handled with urgency.
Learn more →02
A new boiler matched to the home, its radiators, and its hot-water needs.
Learn more →03
A clean swap when the old unit costs more to keep than to change.
Learn more →04
Yearly cleaning and checks that keep winter from finding weaknesses first.
Learn more →05
Steam heat done properly: water level, pressure, vents, and traps in balance.
Learn more →06
Hydronic systems that circulate hot water quietly to every radiator and baseboard.
Learn more →07
Cold, leaking, or missing radiators fixed or fitted to the system you have.
Learn more →08
Hot water from your boiler through a storage tank, without a second burner.
Learn more →09
One unit for heating and hot water, sized to the home and its bathrooms.
Learn more →10
Baseboard loops repaired, replaced, and balanced room by room.
Learn more →11
Warm floors fed by the boiler, for remodels and additions.
Learn more →12
Thermostats and zone valves so rooms call for heat on their own schedules.
Learn more →13
Sludge and scale cleared out, so water moves freely and parts last longer.
Learn more →14
Switching an oil system to gas where the home and the mains allow it.
Learn more →15
Boiler work for offices, shops, and apartment buildings, at commercial scale.
Learn more →Start with the symptom, not the product name. A house with no heat at all needs a different conversation than a house with one cold room, and a house planning a renovation needs a different conversation again. The fifteen services on this page divide along those lines: urgent repair, planned replacement, yearly care, and the parts of the system that carry heat from the boiler to the room.
If the boiler has stopped, or it locks out and will not stay running, the repair page is the right starting point, since it explains what to check before you call and what a technician tests first. If the boiler runs but one room stays cold, look at the radiator, baseboard, control, or zone pages instead, since the fault usually sits at the end of the loop rather than at the boiler itself. If the boiler is old and the repairs keep coming, the replacement page explains how to weigh the pattern of breakdowns against the state of the whole system, rather than judging one breakdown on its own.
| What you notice | Where to start | What it usually involves |
|---|---|---|
| No heat, or a boiler that keeps locking out | Emergency repair | Testing the boiler, the controls, and the safety devices in turn |
| One room or one floor stays cold | Radiators, baseboards, or zone controls | Bleeding, valves, balancing, and circulation checks |
| Repeated breakdowns across a season | Replacement | Sizing a new unit to the house as it stands today |
| A boiler that runs but never seems serviced | Maintenance and tune-up | Cleaning, testing, and a full heat cycle from cold |
| Hot water that runs out or arrives slowly | Indirect tanks or combi units | Checking how the boiler makes domestic hot water |
Commercial buildings follow the same logic at a larger scale. An office, a shop, or an apartment building still starts with the symptom, but the check covers every zone and every loop, since a fault in a shared system affects more than one household or tenant. The commercial page explains that wider check, and the locations pages explain how the same services play out town by town, from old steam houses in the north to newer zoned homes in the south.
Every visit follows the same order, whether the job is a repair, a replacement, or a yearly check. The order matters, since testing before replacing parts is what keeps a small fault from turning into a large bill, and it is also what keeps the diagnosis honest when the news is that a part, or the whole unit, has reached the end of its run.
That last step is the one most worth asking about. A boiler that fires once and stops has not been tested, and a radiator that warms at the top while staying cold at the bottom has not been bled properly. A full cycle catches both, and it also catches the faults that only appear when every zone calls for heat at once, which is exactly the moment a cold snap demands the most from the system.
Think of the fifteen services as layers. At the center sits the boiler itself, covered by repair, installation, replacement, and maintenance. Around it sit the two ways heat leaves the boiler, steam and hot water, each with its own habits, parts, and failure modes. Around those sit the emitters that put heat into rooms, radiators, baseboards, and radiant floors, plus the indirect tanks and combi units that turn boiler heat into domestic hot water.
The outer layer is control and water quality: zone valves and thermostats that decide which rooms call for heat, and flushing and water treatment that keep the water moving cleanly through old iron pipe. Oil-to-gas conversion sits across the layers, since it changes the fuel and the burner while keeping the radiators, loops, and controls. A job rarely touches one layer alone, which is why every service page links to the neighboring services that usually come up alongside it.
A note on sizing
Almost every service page returns to the same point: size to the house as it stands today, with its insulation, windows, additions, and radiators, not to the size of the old unit. Houses change over decades, and a boiler copied from a drafty original usually short-cycles in the insulated house that replaced it, wearing parts faster and leaving rooms uneven.
Not sure which service fits? Call and describe what your boiler is doing.
Call (302) 291-0790Every service above is available anywhere in Delaware, for homes and for businesses. Service pages describe the work itself; the locations pages describe the towns, the housing, and the local conditions that shape each job. If your town does not have its own page, call anyway: statewide means statewide, and the locations pages cover the towns where boiler demand runs highest.
Call Boiler Guard Delaware and talk through what your system is doing. Homes and businesses, across all of Delaware.
Last updated: October 26, 2026.