Oil Boiler Repair in Southern NH

Oil Heat Fails in Specific, Findable Ways

When an oil boiler stops making heat, the cause is usually small and specific. A fouled nozzle. A drifted electrode. A pump that lost prime. A primary control that keeps tripping. Jolt Electric & HVAC repairs oil boilers across Southern New Hampshire, and we'd rather find the actual fault than swap parts until something works. We're a veteran-owned company with over 30 years on this equipment, and our technicians are licensed and insured.

Oil boilers aren't gas boilers with different fuel. The burner, the fuel train, the combustion setup, and the failure modes are all different, and diagnosing them takes hands that have been in a lot of them.

Signs Your Oil Boiler Needs a Technician

• Rumbling, banging, or a hard rattle on startup
• Soot around the burner or a smell of oil in the basement
• Radiators or baseboard heating unevenly across zones
• The boiler runs but domestic hot water goes cold fast
• Frequent resets on the primary control
• Oil consumption climbing with no change in the weather
• Visible rust, weeping seams, or water on the floor around the unit

An oil boiler rarely dies without warning. It tells you first, usually for a season or two, and the people who catch it early pay a fraction of what the people who ignore it end up paying.

Oil Boiler Repairs We Handle

• Burner tune-ups, nozzle and electrode replacement, and combustion setup
• Fuel pump, filter, and oil line repairs
• Primary control and cad cell relay replacement
• Circulator pump and zone valve failures
• Aquastat and thermostat wiring faults
• Expansion tank, relief valve, and low-water cutoff service
• Leak diagnosis and sectional repair where the block allows it

We work with premium-quality parts and equipment, and our trucks carry the common oil-side failures so a February call doesn't turn into two trips.

Why Oil Burners Fail Differently Than Gas

Gas systems tend to fail at the ignitor or the flame sensor. Oil fails at the fuel train. Nozzles clog and change spray pattern, electrodes drift out of spec, filters load up, and pumps lose prime after a tank runs low. Sludge pulled off the bottom of a tank will take out a nozzle and a filter in the same week. None of that shows up on a gas unit, which is why oil work rewards experience more than most trades.

Steam and Hot Water: We Repair Both

Older homes in Manchester and Nashua still run steam, and steam is its own trade. Pitch, venting, and pressure settings matter more than anything on the boiler itself. We repair and maintain steam systems as well as hot water baseboard and radiant, and we know when a steam problem is actually a piping problem.

When a Repair Stops Making Sense

Cast iron boilers can run 30 years or more, so the repair-or-replace call is rarely obvious. If the block is sound and the unit holds 80% or better after a cleaning, keep it and maintain it. If it's weeping at the seams or the block is cracked, the system comes out. We give you the combustion numbers and the fuel math, then you decide. If replacing it instead is where you land, we'll price that path too.

What a Jolt Service Call Looks Like

We confirm the appointment window, arrive with the truck stocked, and diagnose before quoting. You get the actual finding, the price to fix it, and the option to say no. No upsell theater, no mystery line items. If the repair needs a part we don't carry, we tell you the timeline that same day. We handle emergency boiler repair when a house is losing heat in hard cold.

Why Homeowners Here Call Jolt

Three decades on oil equipment in these towns. We're large enough to handle commercial mechanical work and small enough that the owner hears about every job. We don't compete on the cheapest bid, we compete on the combustion numbers being right when we leave. Ask about how to spread the cost if a repair turns into a bigger project, and about getting it cleaned if it's been more than a year.

You can see our boiler services for the full picture, or check the towns we cover.

Oil Boiler Service Across Southern New Hampshire

We repair oil boilers in Litchfield, Nashua, Manchester, Hudson, Merrimack, Amherst, Bedford, Derry, Goffstown, Hollis, Londonderry, Milford, Salem, and Windham.

Losing heat from an oil boiler in Southern NH? Reach out and we'll get a technician headed your way.

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