Boiler Repair on a Pressure Vessel That Burns Fuel

That sentence is the whole site. A furnace blows warm air; a boiler holds water in a closed loop under pressure and burns something to heat it, and both halves of that have consequences.

In brief

A boiler is a pressure vessel that burns fuel, which makes two things matter more than anything else: the pressure gauge, and carbon monoxide. CPSC recommends alarms on every level of a home and annual professional inspection of the heating system.

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

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 pressure half

Water expands when heated, so a sealed loop carries a working pressure, an expansion tank to absorb the change and a relief valve in case it does not. The gauge is the only window into all three and it is the most useful number on the appliance.

Water on the floor near a boiler is frequently the relief valve having done its job rather than a leak — which means pressure went somewhere it should not have, and that is the fault to chase.

The combustion half

CPSC recommends CO alarms on every level of the home and outside sleeping areas, and not in kitchens or above fuel-burning appliances. It describes low to moderate poisoning as producing symptoms "similar to the flu (but without the fever)".

If an alarm sounds: outside immediately, then call 911, and do not go back in until responders say so. Not open windows first, and not look for the source.

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

The service that connects them

"Have the heating system professionally inspected and serviced annually to ensure proper operation" is CPSC’s wording. On oil that appointment happens anyway because the burner has consumables; on gas nothing forces it, so it is the one that gets skipped.

And what the standards ask of the appliance

DOE sets minimum AFUE at 84% for gas-fired hot water boilers, 82% for gas-fired steam, 86% for oil-fired hot water and 85% for oil-fired steam, with design requirements attached. What AFUE does not measure is the part worth reading before a quote.

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

Where we publish

We publish a town page only where fuel oil reaches 5% of households — 1,102 towns across 24 states — and a state page everywhere else. A boiler page for a town with no boilers in it would carry one fact and it would not be a useful one.

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.

Call (888) 510-4130