{"id":"unit-heater-gas","version":"0.3.0","classification":{"uniformat":"D3050"},"names":["Unit heater, gas-fired"],"aliases":["gas unit heater","UH"],"service_life":{"median_years":20,"range_years":[20,20],"range_basis":"source_spread"},"pm_tasks":[{"task":"Check firebox liner for cracks and leaks","frequency":"P1Y","reference":"Public Buildings Service Preventive Maintenance Guide (Public Buildings Maintenance Standards)","url":"https://web.archive.org/web/20231003141600/https://origin-www.gsa.gov/system/files/GSA%20PBS%20Preventive%20Maintenance%20Guide%202022-01302023_0.pdf","page":492,"checklist":"HVAC-UHT-02-01Y Unit Heater - Gas or Oil"},{"task":"Check gas lines for leaks","frequency":"P1Y","reference":"Public Buildings Service Preventive Maintenance Guide (Public Buildings Maintenance Standards)","url":"https://web.archive.org/web/20231003141600/https://origin-www.gsa.gov/system/files/GSA%20PBS%20Preventive%20Maintenance%20Guide%202022-01302023_0.pdf","page":492,"checklist":"HVAC-UHT-02-01Y Unit Heater - Gas or Oil"},{"task":"Check flue for obstructions and leaks","frequency":"P1Y","reference":"Public Buildings Service Preventive Maintenance Guide (Public Buildings Maintenance Standards)","url":"https://web.archive.org/web/20231003141600/https://origin-www.gsa.gov/system/files/GSA%20PBS%20Preventive%20Maintenance%20Guide%202022-01302023_0.pdf","page":492,"checklist":"HVAC-UHT-02-01Y Unit Heater - Gas or Oil"},{"task":"Clean bottom of flue (breeching)","frequency":"P1Y","reference":"Public Buildings Service Preventive Maintenance Guide (Public Buildings Maintenance Standards)","url":"https://web.archive.org/web/20231003141600/https://origin-www.gsa.gov/system/files/GSA%20PBS%20Preventive%20Maintenance%20Guide%202022-01302023_0.pdf","page":492,"checklist":"HVAC-UHT-02-01Y Unit Heater - Gas or Oil"},{"task":"Clean fans and motors","frequency":"P1Y","reference":"Public Buildings Service Preventive Maintenance Guide (Public Buildings Maintenance Standards)","url":"https://web.archive.org/web/20231003141600/https://origin-www.gsa.gov/system/files/GSA%20PBS%20Preventive%20Maintenance%20Guide%202022-01302023_0.pdf","page":492,"checklist":"HVAC-UHT-02-01Y Unit Heater - Gas or Oil"},{"task":"Check controls and safeties","frequency":"P1Y","reference":"Public Buildings Service Preventive Maintenance Guide (Public Buildings Maintenance Standards)","url":"https://web.archive.org/web/20231003141600/https://origin-www.gsa.gov/system/files/GSA%20PBS%20Preventive%20Maintenance%20Guide%202022-01302023_0.pdf","page":492,"checklist":"HVAC-UHT-02-01Y Unit Heater - Gas or Oil"},{"task":"Lubricate","frequency":"P1Y","reference":"Public Buildings Service Preventive Maintenance Guide (Public Buildings Maintenance Standards)","url":"https://web.archive.org/web/20231003141600/https://origin-www.gsa.gov/system/files/GSA%20PBS%20Preventive%20Maintenance%20Guide%202022-01302023_0.pdf","page":492,"checklist":"HVAC-UHT-02-01Y Unit Heater - Gas or Oil"}],"basis":[{"type":"public_document","life_type":"accounting","title":"Greater Napanee: By-law 2012-11, Tangible Capital Asset Policy, Appendix B Asset Useful Lives","url":"https://greaternapanee.civicweb.net/document/45679","page":16,"label":"E20 Mechanical - Boilers, Fire Panel/Alarm, Unit Heaters, HVAC","years":20,"note":"Capital asset policy (amortization period). Approved on text check: the label and value were found on the cited page. The row names unit heaters among other mechanical items, without the fuel."}],"confidence":{"grade":"C","sample_size":null},"open_questions":["These are Ontario accounting lives from municipal capital asset policies, not planning or observed replacement data.","Written for GSA contracted O&M in US federal buildings; job plans are generic and defer to manufacturer instructions, and the fire extinguisher plans only point to NFPA 10."],"contributors":["unfinished.one editors"],"last_reviewed":"2026-10-22","canonical_url":"https://unfinished.one/c/unit-heater-gas","versioned_url":"https://unfinished.one/c/unit-heater-gas/v/0.3.0","licence":"CC-BY-4.0","citation":"unfinished.one (2026). Unit heater, gas-fired, v0.3.0. https://unfinished.one/c/unit-heater-gas/v/0.3.0"}