Boiler Repair & Replacement in Phenix City, AL

How a hot-water boiler heats your home

A boiler doesn't blow air. A burner heats water inside a heat exchanger, and a circulator pump pushes that water through pipes to radiators, baseboard units or tubing in the floor. The water gives up its heat to the room and comes back to the boiler to be heated again. The result is quiet, even heat without ductwork.

A few supporting parts keep the system in balance. An expansion tank absorbs the extra volume as water heats. A fill valve keeps the system topped up. Air vents release trapped air. A pressure relief valve protects the boiler if pressure climbs too high. Many boiler problems come down to one of these parts, not the boiler itself.

This page is about hot-water systems. Steam boilers are a different animal and are rare around here. If you think you have one, tell us when you call.

Common boiler problems and what they usually mean

Hydronic systems give pretty clear clues. Here's what we look at for each symptom.

• No heat anywhere: ignition or pilot failure, a thermostat or control fault, a failed circulator pump, or low system pressure
• Some radiators cold while others are hot: trapped air, a stuck zone valve or a system that needs balancing
• Radiators warm at the bottom but cold at the top: air in the radiator that needs bleeding
• Kettling, a rumbling like a kettle about to boil: scale or sludge on the heat exchanger causing local overheating
• Banging or knocking pipes: air in the lines, water hammer, or pipes expanding against framing
• Pressure keeps dropping: a leak somewhere in the system or a failing expansion tank
• Pressure climbs and the relief valve drips: a waterlogged expansion tank or a fill valve letting in too much water
• Water under the boiler: a leaking fitting, pump seal, relief valve or, on older units, the boiler sections themselves

Pressure, expansion tanks and relief valves

Most boilers have a combined pressure and temperature gauge on the front. Pressure that stays steady from season to season is a good sign. Pressure that keeps falling means water is escaping somewhere. Pressure that rises well above its normal level when the boiler heats up usually means the expansion tank has lost its air cushion.

The relief valve is the boiler's last line of defense. If it's dripping, the valve itself may be worn, but more often it's reacting to a real pressure problem. Never cap or plug a relief valve. We find and fix whatever is driving the pressure up.

Adding water to a system over and over isn't a fix. Fresh water brings in oxygen and minerals that corrode the inside of the boiler and pipes. A system that needs regular topping up has a leak, and it's worth finding.

Boiler safety: combustion, venting and carbon monoxide

A gas or oil boiler burns fuel, so it needs the same combustion and venting checks as a furnace. A blocked flue, a cracked heat exchanger or a burner that isn't burning cleanly can put carbon monoxide into the home.

Keep working CO alarms on every level of the house and outside sleeping areas. That's the guidance from the U.S. Consumer Product Safety Commission. Our article on carbon monoxide and gas heating safety covers the warning signs. If you smell gas, leave the home and call the gas utility or 911 from outside, then call us once it's safe.

Annual boiler service

Boilers are long-lived when they're looked after, and most of the problems above start small. A yearly service visit before the heating season keeps the burner clean, the pressure where it belongs and the safety controls working. It's the same idea as our heating maintenance for furnaces and heat pumps, adapted to hydronic equipment.

• Inspect and clean the burner and check the flame
• Check the heat exchanger and flue for soot, corrosion or blockage
• Test ignition, the pilot or igniter, and the safety controls
• Check system pressure, the expansion tank and the fill valve
• Inspect the relief valve and its discharge pipe
• Check the circulator pump, zone valves and visible piping for leaks
• On condensing boilers, clean the condensate trap and check the drain
• Test for carbon monoxide around the boiler

Repair or replace your boiler?

Many boiler problems are repairs, not replacements. Circulator pumps, expansion tanks, relief valves, fill valves, zone valves, igniters and controls can all be replaced while the boiler itself keeps going.

Replacement is worth discussing when the heat exchanger or a cast-iron section is cracked and leaking, when parts for an old boiler are hard to get, when repairs are coming every season, or when the boiler is much larger than the home needs. We'll show you what we found and talk through the options. Our heating replacement page covers how we approach any new system.

There's another option worth knowing about. Some homeowners with radiators and no ductwork decide to move away from the boiler altogether. A ductless mini-split system can heat and cool without ducts, which matters in a climate with summers as long and humid as ours. It isn't right for every home, but it's a fair comparison to make before replacing a boiler like for like.

High-efficiency condensing boilers, in plain terms

Older boilers send a lot of heat up the chimney with the exhaust. A condensing boiler cools its exhaust enough that water vapor condenses inside the unit, and it captures the heat released in the process. That's where the higher efficiency comes from. Many condensing boilers also have a modulating burner that turns down on mild days instead of running full blast.

They do have requirements. Condensing boilers usually vent through plastic or stainless pipe instead of a chimney, and they need a drain for the acidic condensate, often through a neutralizer. They reach their best efficiency when the water returning from the radiators is relatively cool, so they pair especially well with radiant floors or with controls that lower the water temperature on milder days.

Some models, called combi boilers, also heat your domestic hot water on demand. If you're replacing an aging water heater at the same time, that's worth looking at.

What affects the cost of boiler repair or replacement

Boiler jobs vary more than most heating work, so we quote after seeing the system. You'll get the price in writing before work starts, and financing is available on larger projects.

• Which part failed, and whether parts for your boiler are still stocked
• The boiler's age, type and fuel
• The number of heating zones and the condition of the piping
• Standard or condensing replacement, and any venting changes
• Condensate drain and neutralizer requirements
• Access to the boiler room or basement

Why boilers are a special case around here

Since boilers are uncommon in this part of Alabama and Georgia, parts for an older unit aren't always on the shelf. Some have to be ordered. That's the best reason to call in early fall instead of waiting for the first hard freeze. A small leak or a weak circulator found in October is a calm repair. The same problem in January can mean cold rooms while a part ships.

Weekday hours are Monday through Friday, 8:00am to 6:00pm, and weekend service is available by call. Reach us at +1 (327) 210-5999.