Licensed plumbers, written pricing, based in Danbury
Search for boiler help around Danbury and you mostly get oil companies. Action Construction is the licensed plumbing contractor that installs and repairs the boiler itself and everything piped to it in Danbury, CT: the vessel, the near boiler piping, circulators, zone valves, expansion tanks, and the connections to baseboard and radiators. We install and service Weil McLain, Burnham, Navien, Peerless, and Lochinvar. We are not a fuel delivery company. We are the plumber for the boiler.
Boiler work is the water side of a heating system:
A search for boiler help in this area turns up a lot of oil companies, which tend to focus on the burner and the fuel rather than the piping. We are the licensed plumbing contractor that installs the boiler itself and everything piped to it, and we service gas and oil fired hydronic systems whoever delivers the fuel.
Boiler replacement is worth planning rather than waiting for a January failure. Signs a boiler is near the end include age past 20 to 25 years, rust or weeping at the sections or the tankless coil, short cycling on and off, uneven heat between zones, corrosion on the near boiler piping, a waterlogged expansion tank that keeps tripping the relief valve, and rising fuel use for the same comfort. A boiler that fails in a cold snap is an emergency replacement at a premium with no time to run a load calculation or match the venting properly, so the better path is to replace a tired unit in the spring or fall shoulder season.
When we quote a replacement we size the new unit to a room by room heat loss calculation, not just match the old nameplate, because most older Danbury boilers were oversized and a right sized modern unit cuts fuel use and short cycling both. We also rebuild the near boiler piping to the manufacturer’s specification rather than connecting a new boiler to old, corroded piping, because that piping, the circulator placement, the air separator, and the expansion tank are what protect the new unit and keep the zones balanced. On a high efficiency condensing boiler that means primary secondary piping or a low loss header so the boiler always sees its minimum flow. The written price covers the boiler, the near boiler piping, a new expansion tank and circulator as needed, the venting or a chimney liner where an old atmospheric unit is replaced, the permit, and the municipal inspection.
Repairs include
We carry common parts for Weil McLain, Burnham, Navien, Peerless, and Lochinvar, so a single visit fixes most no heat calls rather than turning into a parts order and a cold weekend. If your hot water comes off the boiler through an indirect tank or a coil, that work ties into water heater installation and water heater repair, and the full list is on our Danbury plumbing services hub.
The split between oil and gas here is real: the city water and gas neighborhoods have largely converted, while many outlying and lake area homes still run oil with an above ground or buried tank. We work on both. When a homeowner is weighing a switch to gas as part of a boiler replacement we lay out the equipment cost, the utility hookup and any main extension, the tank removal, and the payback rather than push one way. A few older downtown multifamily buildings still run steam rather than hot water, and a steam boiler is sized by measuring the connected radiation, not by heat loss, with the Hartford loop and header built to the maker’s diagram or the new boiler carries water over and hammers. We handle those correctly, including skimming the new steam boiler on startup and setting the automatic water feeder and the low water cutoff so it runs quiet.
A hydronic boiler benefits from a yearly service before the cold arrives:
Most no heat calls in January trace back to a fault a fall service would have caught, a waterlogged expansion tank, a tired circulator, a sticking zone valve, a plugged condensate trap on a high efficiency unit, or a control drifting out of range. The service visit is a few hundred dollars against a holiday weekend emergency rate and a cold house. For a building with tenants, a documented annual service also supports the landlord’s duty to provide heat, and we can put a portfolio on a schedule so every boiler is checked on the same visit each fall, before the first cold night rather than after the first no heat call.
The boiler and its water side piping, circulators, zone valves, and expansion tank are plumbing work, which is what we do. A licensed plumbing contractor is the right call for a boiler installation, a leak, or a no heat problem on a hydronic system, and we coordinate with your fuel company on the burner side of an oil unit where that split applies.
Weil McLain, Burnham, Navien, Peerless, and Lochinvar, in gas and oil fired models, for baseboard, radiator, and radiant systems. We help you choose based on your existing distribution, your fuel, whether the chimney or sidewall supports a condensing unit, and whether an indirect tank off the boiler is a better way to make hot water than a separate heater.
A plumber for the boiler itself, its piping, and installation or repair of the water side. A fuel company delivers oil and often services the burner on oil units. We handle the boiler and the plumbing side and coordinate with your fuel supplier when needed.
It depends on the fuel, the size, whether it is a cast iron or a high efficiency condensing unit, and how much of the near boiler piping and venting needs rebuilding. We provide a written installed price after a heat loss calculation, including the permit and inspection, before any work begins.
Usually not the boiler itself. A single cold zone points at a stuck zone valve, a failed circulator on that loop, an air bound line that needs bleeding, or a balancing problem. All of those are repairs we handle, and we diagnose which one before quoting.
Licensed & Insured | Residential & Commercial | Serving CT & NY