Plumbing-side boiler problems we handle
A boiler is part of the plumbing system. Water leaks, failed valves, pressure problems and waterlogged expansion tanks are all plumbing issues.
If the problem is the burner, the controls or combustion, we say so and recommend the right contractor instead of guessing.
Symptoms and common causes
These are the common calls.
| Symptom | Common cause | Fix |
|---|---|---|
| Pressure drops to zero | Leak or failed expansion tank | Find the leak, replace the tank. |
| Pressure too high | Waterlogged expansion tank or fill valve | Replace the tank or valve. |
| Banging or knocking | Air in the lines or low water | Purge the system, check the level. |
| Radiators cold at the top | Trapped air | Bleed the radiators. |
| Water on the floor | Relief valve, leaking fitting or boiler body | Repair the fitting, replace the valve. |
| No heat | Circulator, zone valve, or controls | Test and replace the part. |
A boiler with a leaking body is usually at end of life.
Expansion tanks
An expansion tank gives heated water room to expand. When the bladder fails, the tank fills with water and pressure spikes, which opens the relief valve and wets the floor.
Replacing the tank is a common repair and often fixes repeated pressure problems. We check the air charge and the connection before and after.
Winter safety
Never ignore the smell of gas. Leave the house and call PSE&G at 1-800-880-7734, then call 911 if the smell is strong.
Install a carbon monoxide alarm near the boiler and on each floor. Boilers burning gas or oil produce carbon monoxide if the venting or combustion is faulty. Have the boiler serviced each year.
Before you call
Quick checks save time.
- Check that the thermostat is set to heat and the batteries are fresh.
- Look at the pressure gauge, which should usually read between 12 and 15 psi when cold.
- Check the power switch and the breaker.
- Look for water on the floor and note where it comes from.
- Write down any error code or blinking light.
Tell us what you see. It helps us bring the right parts.
How a visit works
You approve the plan before we start.
- InspectWe check pressure, valves, the tank and visible leaks.
- DiagnoseWe identify the failed part or the cause of the leak.
- RepairWe replace the part or fitting.
- TestWe bring the system up and check each zone.
Steam or hot water: know which you have
A hot water boiler pushes heated water through pipes to radiators or baseboard. A steam boiler boils water and sends steam up to radiators, where it condenses and runs back down. Steam systems have a sight glass on the boiler and radiator valves that hiss.
The difference matters because the faults differ. Steam systems fail on low water cutoffs, clogged returns and stuck vents. Hot water systems fail on circulators, zone valves and pressure. Tell us which you have when you call.
Keeping a boiler healthy through winter
Check the pressure gauge monthly in the heating season. Keep storage away from the boiler, leave space for service and never stack boxes against it. Bleed radiators in the fall if they stay cold at the top.
A yearly service by a heating contractor catches burner and combustion problems early. For the plumbing side, a quick look at valves, the expansion tank and visible fittings can head off a leak.
Standards for boiler plumbing
New Jersey's plumbing subcode adopts the National Standard Plumbing Code Illustrated, 2021 edition, through N.J.A.C. 5:23-3.15. It covers relief valve discharge piping, backflow protection on the fill line and the expansion tank connection. Burner and venting rules sit in separate fuel gas and mechanical codes, which is why we hand those to a heating contractor.
What changes boiler repair pricing
We quote before work starts.
- Part and laborA relief valve costs less than a circulator or a tank.
- Boiler age and typeOlder steam systems can need harder-to-find parts.
- AccessA tight utility room takes longer.
- ZonesMore zones means more valves to test.
- After-hours dispatchWinter nights cost more, and we tell you first.
Insurance note: a sudden boiler leak that damages property may be covered, while wear and tear on the boiler is not.
Cold house? Call (973) 488-5410.
Questions Belleville homeowners ask about boiler repair
Yes. Our line is open 24/7. We handle the plumbing side and tell you if the job needs a heating contractor.
A leak or a failed expansion tank is the usual cause. We find which.
Yes. Trapped air is a common reason radiators stay cold at the top.
If the boiler body leaks, or repairs are frequent and it is old, replacement may make sense. We give both options.
We handle plumbing. For burner and combustion work, we recommend a qualified heating contractor.
Leave the building and call PSE&G at 1-800-880-7734, then 911 if the smell is strong.