Gas is the default here
Utility gas heats 69.6% of occupied homes in Philadelphia County. A gas boiler fits the fuel line most houses already have, which keeps the installation closer to a swap than a conversion.
Boiler Installation in Philadelphia, PA
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Step 1 of 3: Equipment
What that means for the job
If your house already runs on gas, the contractor is working with a line that's there, sized for the fuel, and venting that's already in place to check against the new unit. That's a more straightforward job than bringing in a fuel the house wasn't built for.
Heat goes on in October here and runs through April.
A boiler put in during September is ready before the first cold night, not in the middle of one.
Gas runs $13.12 per million Btu here, so a high-efficiency boiler isn't paying for itself on fuel savings alone
Philadelphia County falls in climate zone 4A, which asks real work of both heating and cooling through the year. Any gas-fired hot water boiler installed here now has to hit 84 percent AFUE if it was manufactured on or after January 15, 2021, so that floor is already built into what a contractor can offer. It narrows the field to units that meet the standard, not the cheapest model on the lot. A system meeting that minimum is also likely to qualify for the federal tax credit on efficient home heating equipment, which is worth asking about when comparing quotes.
A standard boiler is built for a winter like this one
Seven months of heat a year and overnight lows averaging 27 in winter is normal work for a boiler, not a reason to size up. A standard unit that meets the efficiency floor already set for new boilers will do this job. Get a quote and see what fits your house.
Find a contractorThe old boiler gets drained and disconnected
A contractor shuts off the water and gas, drains the boiler and the piping around it, and disconnects the flue, the gas line and the wiring. A steam system also has a condensate or wet return to deal with. Old fittings corrode in place after enough years, and some have to be cut apart rather than unscrewed.
It comes out before the new one goes in
A boiler is heavy and usually too big to carry through a doorway whole, so it gets cut into pieces or stripped down before it leaves the house. A tight basement stairway or a low doorway makes this part slower, and it's worth asking a contractor how that stage will go in your house.
Ask what's actually being quoted, a boiler alone or a boiler with the near-boiler piping, venting and controls it needs to run right. Contractors can quote the same model and mean different jobs. Ask whether the near-boiler piping gets replaced or reused, since old piping sized for an old boiler doesn't always suit a new one. Ask what the venting requirements are for the unit being proposed. A higher-efficiency boiler often vents differently than what's already there, through a different material or a different path out of the house. Ask how the boiler is sized to match the house. A unit too large for the heat loss will short cycle, turning on and off more than it should, and one too small will run long and still come up short on the coldest nights. Ask what's covered under warranty and what voids it, particularly around water quality and annual service, since a boiler run on bad water or skipped maintenance can lose coverage even with a sound install.
Installation day starts before the new boiler ever comes in the door. The old one has to come out first, drained and disconnected, and the space around it gets checked against what the new unit needs for clearance and venting. Once it's in place, the contractor pipes it into the heating system, connects the gas line and flue, and wires it to the controls and thermostat. Then comes filling the system and bleeding the air out of the lines, which takes a while to get right. Before anyone calls it done, the boiler gets fired up and run through its paces, checking the pressure, the temperature rise, and the burner itself to see it's combusting clean. A job done right ends with the contractor walking the house, not just the boiler room, to confirm every radiator or zone is actually getting heat.
