Boiler Repair in Portland, ME

Common boiler problems

• No heat at all: a thermostat, power, fuel, ignition or burner problem.
• Some radiators cold: air in the system, a stuck zone valve or a failed circulator pump.
• Leaking boiler or pipes: a failed fitting, pump seal or valve, or a cracked heat exchanger.
• Relief valve dripping: system pressure too high, often from an expansion tank problem or a failing valve.
• Banging or gurgling: air, sediment or water hammer in the piping.
• No hot water in homes where the boiler also heats the water. See water heater repair.

For other problems, see our main page on plumbing help in Portland, ME.

How urgent is it?

Heating in Maine homes

Just over half of Maine homes relied on heating oil as their main heating fuel in 2023, according to US Census Bureau American Community Survey data cited by the Governor's office, though that share has been falling. Older homes often heat with hot water or steam radiators, so boiler trouble and frozen pipes often show up together in January. Our boiler no-heat checklist covers what to check first.

Plumber or heating technician?

Often both. In Maine, the Maine Fuel Board licenses oil burner technicians and propane and natural gas technicians, so work on burners and fuel systems falls to those license holders. Plumbers commonly handle the water side: piping, circulator pumps, valves, radiators and leaks. Many local companies employ people with both licenses. The Fuel Board offers free license verification online, and the Plumbers' Examining Board licenses plumbers.

Simple checks before you call

• Is the thermostat set to heat and above room temperature, with fresh batteries?
• Is the boiler's power or emergency switch on? On many oil systems it's a red switch near the basement stairs.
• Is there fuel in the tank, or is the gas supply on?
• If the burner has a reset button, press it once at most. If it doesn't start, stop and call rather than pressing it again.
• If only some radiators are cold, bleeding the air out of them may help.

What happens during a boiler visit

1. Safety and fuel checks

   Fuel supply, venting and signs of leaks or combustion problems.

2. Burner and controls

   Ignition, burner, limit controls and thermostat wiring, handled by a Fuel Board licensee on oil or gas systems.

3. Water side

   Pressure, expansion tank, circulators, zone valves, relief valve and piping.

4. Repair and test

   Replace the failed part and run the system until every zone heats.

Repair or replace the boiler?

A failed circulator, zone valve, expansion tank or burner part is usually a straightforward repair. Replacement comes up when the boiler or its heat exchanger is cracked and leaking, repairs keep piling up, or you're weighing a more efficient system or a different fuel. Ask for both options in writing, with the reasons.

What affects the cost

• Fuel type: oil, natural gas or propane equipment and parts.
• The part: a circulator, valve or expansion tank versus a heat exchanger.
• System type: hot water or steam, and the number of zones.
• Timing: nights and weekends in the middle of a cold snap often cost more.
• Age and access: older systems may need harder-to-find parts.

See the plumbing cost guide.

Questions to ask before you hire

• Do your technicians hold Maine Fuel Board licenses for my fuel type?
• Do you also handle the plumbing side, such as circulators and leaks?
• Is this a repair that makes sense on a boiler this age?
• Do you offer yearly maintenance, and what does it include?

What to have ready when you call