Capitol Hill's Victorian rowhouses were heated long before forced air was common, and many of them still run on the original gravity hot-water loops and one-pipe steam systems installed when the blocks around Eastern Market and Lincoln Park were first built. That history is exactly why so many Hill homeowners get the runaround from general HVAC crews: a tech who only knows ducted furnaces will shrug at a hissing steam trap or a radiator that stays cold at the far end of a 120-foot rowhouse. We actually work on these systems — diagnosing water-hammer banging, failed air vents, sludged-up returns, and the low-pressure complaints that plague aging cast-iron boilers in the District's older stock.
Because Hill houses are long, narrow, and tall, heat distribution is its own puzzle: the parlor floor roasts while the top-floor bedroom never warms, or one radiator clanks all night while its neighbor sits silent. We balance and bleed the loop, rebuild or replace steam traps, chase down leaks at old threaded unions, and tell you honestly whether a cracked 80-year-old cast-iron boiler is worth one more season or ready for replacement. If you've added central AC or mini-splits for the DC summers, we make sure the cooling retrofit and the original heat plant coexist instead of fighting each other. Every visit comes with upfront flat-rate pricing and a satisfaction guarantee, so there are no surprises after the work is done.
Capitol Hill note: Most of Capitol Hill sits inside the Capitol Hill Historic District, so exterior changes like a new flue, condensate line, or boiler vent can trip CHRB review — we keep replacements code-compliant and as discreet as a protected rowhouse facade demands, and we're used to squeezing boilers down to tight English-basement mechanical rooms.
Common Boiler & Radiator Repair Issues We Fix in Capitol Hill
- Banging, knocking, or hammering noises in pipes and radiators (water hammer)
- Cold or only partially warm radiators and uneven heating between floors
- Failed or stuck steam traps and air vents
- Boiler leaks, low water level, or pressure problems
- Aging cast-iron boiler at end of life — repair or replace?
- Hissing radiator valves and trapped air needing bleeding
What's Included
- Diagnosis and repair of water hammer and loud banging pipes
- Fixing cold or unevenly heating cast-iron radiators
- Steam trap testing, repair, and replacement
- Leak detection and repair on boilers, valves, and piping
- Low-water and low-pressure troubleshooting and correction
- Radiator bleeding and whole-system balancing
- Annual boiler tune-ups and safety inspections
- Honest assessment and replacement of aging cast-iron boilers
Explore our full Boiler, Radiator & Steam Heat Repair service, or see all HVAC services in Capitol Hill.
What It Costs
Most boiler and radiator repairs in Washington, DC fall between $200 and $1,000, depending on the part and the labor involved, while major repairs on older systems can run from $1,200 to $3,000 or more. An annual service and tune-up typically runs $200 to $500, and a full boiler replacement generally lands between $6,500 and $11,500. Every system is different, so call us for a free, no-obligation estimate before you decide anything.