{"id":"boiler-hw-noncondensing","version":"0.1.0","classification":{"uniformat":"D3020"},"names":["Boiler, hot water, non-condensing"],"aliases":["atmospheric boiler","cast iron boiler","hot water boiler"],"service_life":{"median_years":25,"range_years":[25,25],"range_basis":"source_spread"},"pm_tasks":[],"basis":[{"type":"public_document","life_type":"planning","title":"CNA e-Tool Estimated Useful Life Table","by":"U.S. Department of Housing and Urban Development","url":"https://www.hud.gov/sites/documents/eul_for_cna_e_tool.pdf","page":10,"code":"HUD CNA 3.4.1.2.9","label":"Boilers, Gas Fired, Sectional","years":25,"note":"Same life for family and elderly properties. US multifamily housing. HUD does not separate condensing from non-condensing boilers; its gas-fired sectional and atmospheric rows describe non-condensing types. Its oil/gas/dual-fuel rows (30 years low MBH, 40 years high MBH) are not used because they do not say which kind."},{"type":"public_document","life_type":"planning","title":"CNA e-Tool Estimated Useful Life Table","by":"U.S. Department of Housing and Urban Development","url":"https://www.hud.gov/sites/documents/eul_for_cna_e_tool.pdf","page":10,"code":"HUD CNA 3.4.1.2.12","label":"Boilers, Gas Fired Atmospheric","years":25,"note":"Same life for family and elderly properties. US multifamily housing."}],"confidence":{"grade":"C","sample_size":null},"open_questions":["Only one source so far: HUD planning lives for US multifamily housing. Canadian and observed sources are needed.","No preventive maintenance tasks are sourced yet."],"contributors":["unfinished.one editors"],"last_reviewed":"2026-10-21","canonical_url":"https://unfinished.one/c/boiler-hw-noncondensing","versioned_url":"https://unfinished.one/c/boiler-hw-noncondensing/v/0.1.0","licence":"CC-BY-4.0","citation":"unfinished.one (2026). Boiler, hot water, non-condensing, v0.1.0. https://unfinished.one/c/boiler-hw-noncondensing/v/0.1.0"}