Boiler replacement in Bridgeport for radiator and baseboard homes
A new boiler sized to the radiators you already have, vented correctly, and piped so it runs efficiently rather than short cycling all winter.
Boiler replacement typically runs about $3,700 to $8,300, and up to $12,000 for high-efficiency condensing models; oil boilers run about $4,800 to $9,000. In Bridgeport most boiler swaps take one to two days. We size the boiler to the radiation in the house, plan the venting, pull the permit and test before leaving.
Updated October 2026
Sizing a boiler to the house, not the old one
Most boilers coming out of older Bridgeport homes are oversized, often because the house has since been insulated or had its windows replaced. An oversized boiler short cycles, wastes fuel and wears out sooner. We size the new one from a heat loss calculation and the actual radiation in the rooms.
Near-boiler piping matters as much as the boiler. A condensing boiler piped like an old cast iron unit never condenses and never reaches its rated efficiency, so we pipe each type the way its manufacturer requires.
What decides the price of a new boiler
Published ranges put boiler replacement at about $3,700 to $8,300, up to $12,000 for high-efficiency models. The factors below decide where a job lands.
Boiler type
Cast iron, condensing, combi and oil-fired boilers differ widely in cost.
Venting
A chimney liner or new sidewall PVC venting adds parts and labor.
Near-boiler piping
Repiping for a condensing boiler or new zones adds time.
Hot water
An indirect tank or combi changes the scope.
Old boiler removal
Heavy cast iron sections in tight basements take longer to remove.
Permit
Connecticut heating permits typically run $100 to $300.
What a boiler install includes
- Heat loss calculation and radiation survey
- Removal and disposal of the old boiler
- New boiler set and leveled
- Near-boiler piping to manufacturer spec
- Chimney liner or sidewall PVC venting
- Expansion tank, relief valve and fill valve
- Circulators or zone valves and controls
- Permit, inspection and combustion test
- System filled, purged and balanced
Which boiler fits your house
| Type | Good fit when | Tradeoff |
|---|---|---|
| Cast iron gas or oil | Older radiator systems, sound chimney | Lower efficiency than condensing |
| Condensing gas | You want the lowest fuel use and can vent sidewall | Needs clean water, correct piping, condensate drain |
| Combi | Smaller homes needing heat and hot water from one unit | Limited hot water for simultaneous showers |
| Boiler plus indirect tank | Larger households with high hot water demand | More equipment and floor space |
Gas Boiler Replacement
A gas boiler replacement usually means choosing between a cast iron boiler that vents into the chimney and a wall-hung condensing boiler that vents through the sidewall. Cast iron is simpler, lasts a long time and tolerates older piping. Condensing boilers are far more efficient but need clean water, proper piping and a condensate drain. We look at your radiators, the chimney and the existing piping, then recommend the one that fits the house rather than the most expensive option.
Oil Boiler Replacement
Where gas does not reach the street or you are not ready to convert, a new oil boiler with a modern burner uses noticeably less fuel than a boiler from decades ago. We check the chimney, which often needs a liner for a new appliance, the oil tank and lines, and the burner sizing. If gas is coming to the street soon, we talk through whether an oil-to-gas conversion makes more sense now than a new oil boiler you may replace later.
Condensing Boilers and Venting
A condensing boiler recovers heat from its own exhaust, which cools the exhaust enough that water condenses out of it. That is why it vents through plastic pipe out the sidewall rather than up a masonry chimney, and why it needs a condensate drain, often with a neutralizer. Its efficiency depends on low return water temperatures, which older radiator systems can often deliver on mild days with outdoor reset controls. We set that up at installation, not as an afterthought.
Combination Boilers for Heat and Hot Water
A combi boiler heats the house and makes domestic hot water on demand from one wall-hung unit, freeing up the floor space an old boiler and water heater took. It suits smaller homes and condos with one or two bathrooms. In larger homes where two showers run at once, a boiler paired with an indirect tank usually performs better. We size the hot water side by the household, not just the heating load, before recommending a combi. A combi also needs a gas line sized for its full hot water output.
What we see in Bridgeport homes
Bridgeport's housing runs from historic brownstones to newer condos, and the boiler that fits a three-story brownstone with cast iron radiators is rarely the one that fits a condo with baseboard. Expect a permit as well: Milford and neighboring towns require one plus an inspection for heating installs, and the fee usually runs $100 to $300. We file it, schedule the inspection and are there when the inspector arrives.
We service and install Carrier, Lennox, Trane, Goodman and more
How a boiler replacement runs
- 1
Heat loss and radiation survey
We size the boiler to the house and the radiators.
- 2
Venting and piping plan
Chimney, sidewall and near-boiler piping are planned.
- 3
Written quote
Options by boiler type with the cost of each.
- 4
Permit
We file with the town.
- 5
Removal
The old boiler is drained, disconnected and removed.
- 6
Install and pipe
New boiler, venting, controls and hot water connections.
- 7
Fill, purge and test
The system is filled, air purged, and combustion tested.
Boiler Installation & Replacement questions from Bridgeport homeowners
Cast iron boilers often run 20 years or more; condensing boilers depend heavily on water quality and maintenance.
If you can vent through the sidewall and want the lowest fuel use, usually yes. We check your radiators and piping first.
Yes. A new boiler connects to the existing radiators and piping.
One wall-hung unit that heats the house and makes hot water on demand. It suits smaller homes best.
Usually one to two days. We schedule replacements outside cold snaps where possible.
Yes. We file it and schedule the inspection as part of the job.
Related jobs we handle
Steam Boiler Service
Banging pipes, cold radiators and low-water faults on steam.
Steam Boiler Service in BridgeportOil Burner Service & Annual Cleaning
Nozzle, filters, soot cleaning and a combustion test.
Oil Burner Service & Annual Cleaning in BridgeportOil Tank Replacement
Basement and outdoor oil tanks replaced and removed.
More on oil tank replacementReplace the boiler before it fails in January
Call to book a heat loss survey and a written quote. We plan the venting and piping before we give you a number.