Boiler Repair & HVAC in Corona, Queens

No heat is not a 'next week' problem. We diagnose, repair and replace boilers across Brooklyn and Queens: steam, hot water, high-efficiency combi, and hydronic HVAC systems including fan coils and radiant. No-heat calls get answered after hours.

Corona built out primarily between 1920 and 1955, with the residential interior composed mainly of attached and semi-detached two-family and three-family brick houses on tight lots — working-class construction built for immigrant families who arrived in waves through the early and mid 20th century. That generation of building means galvanized supply lines and cast-iron DWV are the baseline in any unrenewed home, and original steam boilers survive in many of the older two-families and four-story walk-ups. Bathrooms in houses built between 1920 and 1940 frequently retain original hex tile floors and subway tile walls — a sign that the plumbing behind them is also original and overdue for evaluation. Corona's dense two-family stock generates steady boiler service, drain, and repipe work.

One-pipe steam boiler in Corona two-family — some radiators not heating at all

In the 1920s-1940s attached and semi-detached two-family homes that dominate Corona, one-pipe steam systems are the baseline heating configuration, and radiators that produce no heat despite the boiler firing are almost always the result of failed air vents on those radiators or a clogged main vent that prevents air from purging the entire distribution system. In a two-family Corona home, the steam main typically runs through the basement in a loop, and air must be vented from the main before steam can rise into the vertical branches serving individual radiators. If the main vent has failed, radiators at the end of the circuit simply never receive steam. We test and replace main vents and individual radiator vents as a first step — it is the most cost-effective repair for cold radiators in this building type. If venting correction does not resolve the problem, we camera the steam mains for sag or accumulated condensate that requires main re-pitching. The consistent two-family floor plan across Corona means we diagnose steam system issues in these homes efficiently.

Replace steam boiler in Corona two-family — sizing for two units on one system

Corona's two-family brick homes from the 1920s-1940s have a single steam boiler in the basement serving both the first and second floor units from one distribution system, and correct sizing of a replacement boiler requires accounting for the radiation in both units — not just one floor. A common error in boiler replacements in these homes is using the old boiler's input BTU as the sizing reference; original boilers were often oversized at installation, and perpetuating that oversize causes short-cycling and inefficiency. We conduct an EDR survey that counts and measures every cast-iron radiator in both units of the two-family, calculate the required boiler output from the actual radiation, and size the replacement accordingly. The two-family configuration in Corona also means that both units must agree on planned outages for boiler replacement work — we communicate with both floors and schedule replacement to minimize the time either unit is without heat. Where the existing steam main condition is marginal, we include main venting and trap replacement in the replacement scope rather than leaving original distribution components on a new boiler.

Corona two-family — can I add hot water baseboard to one floor without changing the boiler?

Adding forced hot-water baseboard to one floor of a Corona two-family that currently has one-pipe steam is technically possible but requires adding a separate hot-water loop — you cannot use steam distribution piping for hot-water baseboard. The most practical approach is to install a combi boiler or a separate hot-water boiler serving only the floor being converted, while leaving the steam boiler serving the other floor. This is sometimes done when an owner is renovating one unit and wants to modernize its heating while the other unit remains on the original steam system. The complications in a Corona two-family include routing the new hot-water distribution within the unit without impacting the steam mains that run through the basement serving both floors, and managing the fact that the basement boiler room was sized for one boiler. We have done hybrid steam/hot-water configurations in Corona two-families and can assess the specific layout of the home before recommending whether this approach is practical for the space available.