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A boiler breaking down in Union County points a contractor toward age and service history first, not toward the weather. 102 severe weather events were recorded in Union County, Illinois between 2015 and 2024. That puts this area in the middle of the national range, which means severe weather is a real but occasional feature of operating here, not a constant grind on equipment. A boiler that has been properly maintained and correctly installed will usually fail because of worn seals, corroded heat exchangers, or neglected annual servicing, and a contractor will check those before assuming the climate drove the failure.
Boilers in housing this old have typically been repaired more than once, and each prior repair shapes what a contractor finds when the unit is opened: a mix of original components, replacement parts from different generations, and sometimes improvised fixes that worked until they didn't. Half the homes in Union County, Illinois were built in 1975 or earlier (2020-2024 ACS 5-year). That history means a contractor opening a boiler here has to identify exactly what generation of components is running before pricing the job, because a part that fits a system from one service interval will not fit one from another, and some of what is inside older boilers is no longer manufactured at all.
The Parts of a Boiler a Contractor Checks First
The boiler itself sits in the basement or a utility room and is the piece a contractor looks at first. It houses the burner, the heat exchanger, and the controls that govern the whole system. When heat stops arriving at the radiators or baseboard units, the fault usually traces back here.
From the boiler, supply pipes run through the house carrying hot water to each radiator or baseboard convector, then return cooler water back. The circulator pump moves that water through the loop, and the expansion tank absorbs pressure changes as water heats and cools. Both are common problem spots when flow becomes uneven or pressure readings drift.
The drawing shows a typical boiler layout, and a licensed contractor determines which components apply to your specific system.
Get matched in Union CountyUnion County, Illinois, by the numbers
102 severe weather events were recorded in Union County, Illinois between 2015 and 2024.
NOAA National Centers for Environmental Information, Storm Events Database, bulk CSV export, events 2015-01-01 through 2024-12-31.Half the homes in Union County, Illinois were built in 1975 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesUnion County, Illinois holds 7,851 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 77.4% of the occupied homes in Union County, Illinois (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Covering Boiler Repair in Union County, Illinois1 sourced rules and standards
Licensing and Legal Requirements in Union County, Illinois
Illinois leaves HVAC licensing to the municipality: state law lets the corporate authorities of each city or village examine, license and regulate heating, air conditioning and refrigeration contractors, and caps the licence fee they may charge at $50 — so who licenses you depends on the town you work in.
Severe Weather Events in Union County
Boilers work hardest when outside conditions put the most stress on a building's thermal envelope. How much of that stress a system absorbs over the years is a local question, and Union County's weather record is part of the answer.
102 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.