Confirm the boiler type, service, and fuel the specification keeps, then compare them with the boiler schedule and the venting the drawings show: a breeching and stack for conventional boilers, or separate intake and exhaust direct vents for condensing boilers. Then trace the gas train or oil system, the combustion safety controls and alarm, the expansion tank and air separator, and the water treatment equipment to the sheets that show them.
Assemble the review package
Gather the boiler and pump schedules, the boiler room plan and sections, the heating water or steam piping schematic, the roof and wall plans showing stacks or vent terminations, the gas piping or fuel oil drawings, the controls drawings and sequence, the plumbing drawings for makeup water and water treatment, and the issued Section 23 52 00 with the fuel and gas piping sections it points to. Review one boiler from fuel supply to flue before assuming the others match.
WBDG publishes UFGS 23 52 00: Heating Boilers as a public guide-specification reference (accessed October 18, 2026). Use your project’s issued specification and amendments for the actual comparison; the guide specification does not automatically govern your project. The checklist below is an original suggested review workflow, not a reproduction of the UFGS requirements.
Eight checks to run against the issued set
Use one record per location or system. The CSV contains the same eight prompts plus fields for source revisions, observed evidence, the review owner, the decision, and closure references.
| Check | Sources to compare | Question to resolve |
|---|---|---|
| Boiler type and service | Boilers and Hot Water Heating Boilers or Steam Heating Boilers articles + boiler schedule | Do the specification and schedule agree on firetube, watertube, cast iron, or condensing, on hot water or steam, and on the capacity indicated? |
| Burners and fuel | Fuel Burning Equipment and Burners articles + boiler schedule + fuel drawings | Is each boiler shown burning the fuel the specification keeps (oil, gas, or both), with the draft arrangement it selects? |
| Breeching and stacks | Conventional Breeching and Stacks article + roof plan + sections | For conventional boilers, are the breeching and stacks drawn, with stack heights indicated and clearance to combustibles shown? |
| Direct vents for condensing boilers | Direct Vents article + roof or wall plans | For condensing boilers, are a separate combustion air intake and exhaust vent drawn for each boiler, sized and located as the section says to indicate? |
| Combustion safety controls | Combustion Safety Controls and Equipment article + controls drawings + boiler room plan | Are the controller panels, low-water cutoffs, and the alarm bell shown where indicated, with the shutdown conditions the section lists in the sequence? |
| Gas fuel train | Gas Fuel System article + gas piping drawings | Do the gas drawings show the stop valve, strainer, regulator, pressure gauges, and safety shutoff valve the section lists, with provision for valve leakage testing? |
| Fuel oil system | Fuel Oil Storage System and Automatic Safety Shutoff Valve articles + fuel oil drawings | Where oil is fired, is the tank drawn to Section 33 56 10, and is the fire shutoff valve shown at the day tank or building entry with its detector over the burner? |
| Hydronic accessories and water treatment | Expansion Tank, Air Separator, and Boiler Water Treatment articles + piping schematic + plumbing drawings | Are the expansion tank, air separator, and the water treatment equipment the section keeps drawn and connected on the piping and plumbing sheets? |
Worked example: condensing boilers drawn with a conventional stack
Illustrative example: the boiler schedule lists condensing hot water boilers, and the issued Section 23 52 00 keeps the direct vents article. The mechanical roof plan shows a single common stack with a rain hood serving all boilers, and no combustion air intake terminations are drawn.
Ask the mechanical engineer to confirm the boiler type and venting, then draw a separate intake and exhaust vent for each boiler or revise the boiler selection and specification. Recheck the condensate drainage and the roof or wall termination locations before closing the item.
Avoid a false conflict
Section 23 52 00 bundles the boiler with burners, pumps, terminal units, and water treatment, and its edits often lag the schedule. Read the edited project section, since a paragraph deleted for one boiler type may still be there.
When requirements disagree, follow the project’s document-control and clarification process. Do not assume that drawings always override specifications, or the reverse. Identify the exact sources and request an authorized decision.
Close the issue across the affected documents
Record the location or tag, drawing and specification references, issue dates, observed difference, and the decision needed. Assign an owner and keep the item open until the response identifies the governing requirement. Check the revised drawings and specification references together; a response email alone may leave the issued package inconsistent.
For the overall process, use the guide to drawing and specification conflicts. Mark an inapplicable checklist row with a reason, and distinguish a verified correction from a question that still needs design information.
Where Groundbook fits
Groundbook’s drawing and specification review helps investigate potential disagreements in the documents you supply. Include the relevant specification sections and drawing references, then verify the cited evidence with the responsible reviewers before acting on a finding.