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What changed with the boiler or hydronic system?
Tell us whether there is no heat, uneven heat, a cold zone, new noise, water near the equipment, a control message, or a radiator or baseboard that stopped warming.
Boilers and hydronic heat
United services boilers and water-based space-heating systems, including radiators, baseboards, radiant loops, circulators, zones, and controls.
Updated August 27, 2026

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Tell us whether there is no heat, uneven heat, a cold zone, new noise, water near the equipment, a control message, or a radiator or baseboard that stopped warming.
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A hydronic problem can begin at the heat source, pump, zone valve, thermostat, control, pressure or water path, or the heat emitter in the room. The system needs to be traced before a part is chosen.
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Uneven heat can involve flow, air in the system, controls, balancing, a zone fault, or the condition of the boiler and connected equipment. The room symptom alone does not identify the cause.
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The fault, boiler condition, distribution system, controls, venting or combustion path where applicable, property heat needs, and access all affect the decision. An older boiler does not automatically need replacement.
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A boiler heats the building through water-based distribution. A water heater supplies domestic hot water. Combination equipment can do both, so send the model or a photo when available and describe which use has changed.
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If a carbon monoxide alarm sounds, get everyone to fresh air and call emergency services. If you smell natural gas, leave immediately and call 911 and the gas utility from a safe location. Do not troubleshoot the equipment.
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Share the property type, the rooms or zones affected, when the change began, what the thermostat or control shows, and any water, odor, alarm, or new sound. Add a model number or photo only when it is safely accessible.
Common questions
Yes. United works on boilers and hydronic heating systems, including radiators, baseboards, radiant loops, circulators, zones, and controls.
No. This page covers the boiler and hydronic space-heating system. United does not offer general plumbing services such as drains, fixtures, toilets, sewer work, or whole-home repiping.
Primary sources
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