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Repair the Boiler or Replace It

Most of what fails on a boiler is a component with a part number. The exceptions are specific and they are about the vessel rather than the fault.

In brief

Most boiler faults are components and are worth repairing. Three things change that answer: a cracked heat exchanger, which is not a repair at all; an appliance old enough that its efficiency is the real cost; and a fault that has already recurred.

BoilerBridge is a referral service, not a contractor. We connect homeowners with independent contractors. Contractors are required to hold whatever credential their state or municipality demands. Every state page sets out who licenses plumbers there and where to check, so you can confirm before work begins. We carry out no work, we sell no equipment, we do not set prices, and we never charge homeowners anything — the contractors in our network pay us when we route them a call.

The default is repair

Circulators, controls, thermostats, expansion tanks, relief valves, nozzles and filters are all replaceable on an appliance that is otherwise a heat exchanger with a burner under it. No heat, cold radiators and pressure that will not hold are usually components.

Exception one: the heat exchanger has failed

That is the vessel itself, and on any boiler it ends the appliance. A system losing water with no external leak to find is the sign, and it is the reason a contractor will want to establish where the water is going before quoting anything.

Exception two: combustion or venting cannot be made right

If an appliance cannot be brought to safe combustion, it is finished regardless of what a repair would cost. That judgement belongs to whoever takes the readings, and it is not a negotiation.

CPSC’s annual inspection is where this normally surfaces, which is another argument for not skipping it.

Source: US Consumer Product Safety Commission, Carbon Monoxide Fact Sheet.

Exception three: it is being opened up anyway

When a major component is coming out, the labor of putting the old appliance back and the labor of setting a new one down converge, and the running cost of what goes back is the difference. On a pre-standard unit that gap is measurable: DOE’s current minimums are 84 to 86 percent depending on type.

Not an argument for replacing a working boiler. An argument for asking at the moment the decision is already open.

Source: US Department of Energy, Energy Conservation Standards for Residential Boilers.

What to ask before agreeing to either

Which component was tested, and what the combustion readings were. A quote to replace an appliance that does not mention either has reached its conclusion without the two pieces of evidence that support it.

A boiler is not a furnace, and the person you want knows the difference.Tell us it is a boiler, tell us what the gauge reads if you can see it, and we will route you to somebody in your area who works on them. You are never charged. Boilers give this site its name and not its limits.

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