{"id":"boiler-hw-condensing","version":"0.2.0","classification":{"uniformat":"D3020"},"names":["Boiler, hot water, condensing"],"aliases":["condensing boiler","high efficiency boiler"],"service_life":{"median_years":24.8,"range_years":[15,25],"range_basis":"source_spread"},"pm_tasks":[{"task":"Shut down or re-sequence boilers that are not needed","frequency":"P1D","reference":"Operations & Maintenance Best Practices: A Guide to Achieving Operational Efficiency, Release 3.0","url":"https://www.energy.gov/sites/default/files/2020/04/f74/omguide_complete_w-eo-disclaimer.pdf","page":150,"checklist":"9.2.12 Boiler Checklist"},{"task":"Do an overall visual inspection: all equipment operating and safety systems in place","frequency":"P1D","reference":"Operations & Maintenance Best Practices: A Guide to Achieving Operational Efficiency, Release 3.0","url":"https://www.energy.gov/sites/default/files/2020/04/f74/omguide_complete_w-eo-disclaimer.pdf","page":150,"checklist":"9.2.12 Boiler Checklist"},{"task":"Check burner for proper control and cleanliness","frequency":"P1D","reference":"Operations & Maintenance Best Practices: A Guide to Achieving Operational Efficiency, Release 3.0","url":"https://www.energy.gov/sites/default/files/2020/04/f74/omguide_complete_w-eo-disclaimer.pdf","page":150,"checklist":"9.2.12 Boiler Checklist"},{"task":"Check motor condition: proper function and temperatures","frequency":"P1D","reference":"Operations & Maintenance Best Practices: A Guide to Achieving Operational Efficiency, Release 3.0","url":"https://www.energy.gov/sites/default/files/2020/04/f74/omguide_complete_w-eo-disclaimer.pdf","page":150,"checklist":"9.2.12 Boiler Checklist"},{"task":"Check boiler room air temperature stays within design limits","frequency":"P1D","reference":"Operations & Maintenance Best Practices: A Guide to Achieving Operational Efficiency, Release 3.0","url":"https://www.energy.gov/sites/default/files/2020/04/f74/omguide_complete_w-eo-disclaimer.pdf","page":150,"checklist":"9.2.12 Boiler Checklist"},{"task":"Keep daily boiler log: fuel used, flue gas temperature, makeup water, steam output; watch for variations","frequency":"P1D","reference":"Operations & Maintenance Best Practices: A Guide to Achieving Operational Efficiency, Release 3.0","url":"https://www.energy.gov/sites/default/files/2020/04/f74/omguide_complete_w-eo-disclaimer.pdf","page":151,"checklist":"Boiler Checklist (contd)"},{"task":"Confirm the boiler water treatment system is working","frequency":"P1D","reference":"Operations & Maintenance Best Practices: A Guide to Achieving Operational Efficiency, Release 3.0","url":"https://www.energy.gov/sites/default/files/2020/04/f74/omguide_complete_w-eo-disclaimer.pdf","page":151,"checklist":"Boiler Checklist (contd)"},{"task":"Measure flue gas composition and temperature at selected firing positions","frequency":"P1W","reference":"Operations & Maintenance Best Practices: A Guide to Achieving Operational Efficiency, Release 3.0","url":"https://www.energy.gov/sites/default/files/2020/04/f74/omguide_complete_w-eo-disclaimer.pdf","page":151,"checklist":"Boiler Checklist (contd)"},{"task":"Check all relief valves for leaks","frequency":"P1W","reference":"Operations & Maintenance Best Practices: A Guide to Achieving Operational Efficiency, Release 3.0","url":"https://www.energy.gov/sites/default/files/2020/04/f74/omguide_complete_w-eo-disclaimer.pdf","page":151,"checklist":"Boiler Checklist (contd)"},{"task":"Clean pilot and burner assemblies; look for mineral or corrosion buildup","frequency":"P1W","reference":"Operations & Maintenance Best Practices: A Guide to Achieving Operational Efficiency, Release 3.0","url":"https://www.energy.gov/sites/default/files/2020/04/f74/omguide_complete_w-eo-disclaimer.pdf","page":151,"checklist":"Boiler Checklist (contd)"},{"task":"Stop fuel flow to check flame failure response, restart and observe flame","frequency":"P1W","reference":"Operations & Maintenance Best Practices: A Guide to Achieving Operational Efficiency, Release 3.0","url":"https://www.energy.gov/sites/default/files/2020/04/f74/omguide_complete_w-eo-disclaimer.pdf","page":151,"checklist":"Boiler Checklist (contd)"},{"task":"Inspect system for water or steam leaks, defective valves and traps, corroded piping, insulation","frequency":"P1W","reference":"Operations & Maintenance Best Practices: A Guide to Achieving Operational Efficiency, Release 3.0","url":"https://www.energy.gov/sites/default/files/2020/04/f74/omguide_complete_w-eo-disclaimer.pdf","page":151,"checklist":"Boiler Checklist (contd)"},{"task":"Inspect combustion air damper and fuel valve linkages for setting and tightness","frequency":"P1W","reference":"Operations & Maintenance Best Practices: A Guide to Achieving Operational Efficiency, Release 3.0","url":"https://www.energy.gov/sites/default/files/2020/04/f74/omguide_complete_w-eo-disclaimer.pdf","page":151,"checklist":"Boiler Checklist (contd)"},{"task":"Inspect boiler for air leaks; check damper seals","frequency":"P1W","reference":"Operations & Maintenance Best Practices: A Guide to Achieving Operational Efficiency, Release 3.0","url":"https://www.energy.gov/sites/default/files/2020/04/f74/omguide_complete_w-eo-disclaimer.pdf","page":151,"checklist":"Boiler Checklist (contd)"},{"task":"Measure flue gas composition over the full firing range and compare with last month","frequency":"P1M","reference":"Operations & Maintenance Best Practices: A Guide to Achieving Operational Efficiency, Release 3.0","url":"https://www.energy.gov/sites/default/files/2020/04/f74/omguide_complete_w-eo-disclaimer.pdf","page":151,"checklist":"Boiler Checklist (contd)"},{"task":"Check combustion air openings to boiler room and boiler are adequate and clean","frequency":"P1M","reference":"Operations & Maintenance Best Practices: A Guide to Achieving Operational Efficiency, Release 3.0","url":"https://www.energy.gov/sites/default/files/2020/04/f74/omguide_complete_w-eo-disclaimer.pdf","page":152,"checklist":"Boiler Checklist (contd)"},{"task":"Check belt tension and packing glands for leakage","frequency":"P1M","reference":"Operations & Maintenance Best Practices: A Guide to Achieving Operational Efficiency, Release 3.0","url":"https://www.energy.gov/sites/default/files/2020/04/f74/omguide_complete_w-eo-disclaimer.pdf","page":152,"checklist":"Boiler Checklist (contd)"},{"task":"Check for air leaks around access openings and flame scanner","frequency":"P1M","reference":"Operations & Maintenance Best Practices: A Guide to Achieving Operational Efficiency, Release 3.0","url":"https://www.energy.gov/sites/default/files/2020/04/f74/omguide_complete_w-eo-disclaimer.pdf","page":152,"checklist":"Boiler Checklist (contd)"},{"task":"Check blower belts for tightness and slippage","frequency":"P1M","reference":"Operations & Maintenance Best Practices: A Guide to Achieving Operational Efficiency, Release 3.0","url":"https://www.energy.gov/sites/default/files/2020/04/f74/omguide_complete_w-eo-disclaimer.pdf","page":152,"checklist":"Boiler Checklist (contd)"},{"task":"Check gaskets seal tightly; replace if not","frequency":"P1M","reference":"Operations & Maintenance Best Practices: A Guide to Achieving Operational Efficiency, Release 3.0","url":"https://www.energy.gov/sites/default/files/2020/04/f74/omguide_complete_w-eo-disclaimer.pdf","page":152,"checklist":"Boiler Checklist (contd)"},{"task":"Inspect boiler insulation and casing for hot spots","frequency":"P1M","reference":"Operations & Maintenance Best Practices: A Guide to Achieving Operational Efficiency, Release 3.0","url":"https://www.energy.gov/sites/default/files/2020/04/f74/omguide_complete_w-eo-disclaimer.pdf","page":152,"checklist":"Boiler Checklist (contd)"},{"task":"Check pressure reducing/regulating valves operate properly","frequency":"P1M","reference":"Operations & Maintenance Best Practices: A Guide to Achieving Operational Efficiency, Release 3.0","url":"https://www.energy.gov/sites/default/files/2020/04/f74/omguide_complete_w-eo-disclaimer.pdf","page":152,"checklist":"Boiler Checklist (contd)"},{"task":"Test boiler water quality for chemical balance","frequency":"P1M","reference":"Operations & Maintenance Best Practices: A Guide to Achieving Operational Efficiency, Release 3.0","url":"https://www.energy.gov/sites/default/files/2020/04/f74/omguide_complete_w-eo-disclaimer.pdf","page":152,"checklist":"Boiler Checklist (contd)"},{"task":"Clean water-side surfaces per manufacturer","frequency":"P1Y","reference":"Operations & Maintenance Best Practices: A Guide to Achieving Operational Efficiency, Release 3.0","url":"https://www.energy.gov/sites/default/files/2020/04/f74/omguide_complete_w-eo-disclaimer.pdf","page":152,"checklist":"Boiler Checklist (contd)"},{"task":"Clean fire-side surfaces per manufacturer","frequency":"P1Y","reference":"Operations & Maintenance Best Practices: A Guide to Achieving Operational Efficiency, Release 3.0","url":"https://www.energy.gov/sites/default/files/2020/04/f74/omguide_complete_w-eo-disclaimer.pdf","page":152,"checklist":"Boiler Checklist (contd)"},{"task":"Inspect and repair fire-side refractories","frequency":"P1Y","reference":"Operations & Maintenance Best Practices: A Guide to Achieving Operational Efficiency, Release 3.0","url":"https://www.energy.gov/sites/default/files/2020/04/f74/omguide_complete_w-eo-disclaimer.pdf","page":152,"checklist":"Boiler Checklist (contd)"},{"task":"Remove and recondition or replace relief valve","frequency":"P1Y","reference":"Operations & Maintenance Best Practices: A Guide to Achieving Operational Efficiency, Release 3.0","url":"https://www.energy.gov/sites/default/files/2020/04/f74/omguide_complete_w-eo-disclaimer.pdf","page":152,"checklist":"Boiler Checklist (contd)"},{"task":"Clean electrical terminals; check electronic controls and replace defective parts","frequency":"P1Y","reference":"Operations & Maintenance Best Practices: A Guide to Achieving Operational Efficiency, Release 3.0","url":"https://www.energy.gov/sites/default/files/2020/04/f74/omguide_complete_w-eo-disclaimer.pdf","page":152,"checklist":"Boiler Checklist (contd)"},{"task":"Check and repair hydraulic and pneumatic valves","frequency":"P1Y","reference":"Operations & Maintenance Best Practices: A Guide to Achieving Operational Efficiency, Release 3.0","url":"https://www.energy.gov/sites/default/files/2020/04/f74/omguide_complete_w-eo-disclaimer.pdf","page":152,"checklist":"Boiler Checklist (contd)"},{"task":"Adjust for optimal flue gas composition; record composition, firing position, temperature","frequency":"P1Y","reference":"Operations & Maintenance Best Practices: A Guide to Achieving Operational Efficiency, Release 3.0","url":"https://www.energy.gov/sites/default/files/2020/04/f74/omguide_complete_w-eo-disclaimer.pdf","page":152,"checklist":"Boiler Checklist (contd)"},{"task":"Eddy current test tubes for wall thickness, as required","frequency":"P1Y","reference":"Operations & Maintenance Best Practices: A Guide to Achieving Operational Efficiency, Release 3.0","url":"https://www.energy.gov/sites/default/files/2020/04/f74/omguide_complete_w-eo-disclaimer.pdf","page":152,"checklist":"Boiler Checklist (contd)"}],"basis":[{"type":"public_document","life_type":"planning","title":"Energy Conservation Program: Energy Conservation Standards for Commercial Packaged Boilers (final rule), 85 FR 1592, January 10, 2020","by":"U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy","url":"https://www.govinfo.gov/content/pkg/FR-2020-01-10/pdf/2019-26356.pdf","page":43,"code":"IV.F.7","label":"Lifetime: \"a retirement function ... with a resulting mean lifetime of 24.8 years\"","years":24.8,"note":"Printed page 1634. DOE applies one lifetime to every commercial packaged boiler class, which includes hot-water condensing and steam boilers. Not specific to either. Also stated on p.3 (printed 1594)."},{"type":"public_document","life_type":"planning","title":"Purchasing Energy-Efficient Boilers (web page, modified 2026-09-09)","by":"U.S. Department of Energy, Federal Energy Management Program","url":"https://www.energy.gov/cmei/femp/purchasing-energy-efficient-boilers","code":"Tables 3 and 4 assumptions","label":"Assumed boilers operate for 1,500 full-load hours per year and have a lifetime of 25 years.","years":25,"note":"Small commercial (Table 3, 300,000-2,500,000 Btu/h, 94-98% thermal efficiency examples) and large commercial (Table 4, 1,400 h, also 25 years) hot-water boilers; the efficient examples are condensing. Table 2 (residential boilers) uses 20 years. Not for steam."},{"type":"public_document","life_type":"accounting","title":"General depreciation rates (IR265), July 2021","by":"Inland Revenue (Te Tari Taake), New Zealand","url":"https://www.ird.govt.nz/-/media/project/ir/home/documents/forms-and-guides/ir200---ir299/ir265/ir265-2021.pdf","page":44,"code":"BOIL","label":"Boilers","years":25,"note":"Printed page 44. Boilers, type not stated. Asset category 'Boilers and heaters (where not industry specified)'. Printed DV 8%, SL 6%. Tax depreciation lives set by the Commissioner of Inland Revenue for New Zealand income tax, not engineering or asset-management lives; they are banded and often short (e.g. reticulation piping 25 years). The July 2021 edition was the newest PDF reachable; the online Depreciation Rate Finder may hold later determinations."},{"type":"public_document","life_type":"accounting","title":"General depreciation rates (IR265), July 2021","by":"Inland Revenue (Te Tari Taake), New Zealand","url":"https://www.ird.govt.nz/-/media/project/ir/home/documents/forms-and-guides/ir200---ir299/ir265/ir265-2021.pdf","page":44,"code":"BOIL","label":"Boilers (packaged)","years":15.5,"note":"Printed page 44. Packaged boilers, hot water or steam not stated. Asset category 'Boilers and heaters (where not industry specified)'. Printed DV 13%, SL 8.5%. Tax depreciation lives set by the Commissioner of Inland Revenue for New Zealand income tax, not engineering or asset-management lives; they are banded and often short (e.g. reticulation piping 25 years). The July 2021 edition was the newest PDF reachable; the online Depreciation Rate Finder may hold later determinations."},{"type":"public_document","life_type":"planning","title":"Future Buildings Standard: final stage impact assessment (RPC-MHCLG-25104-IA), 24 March 2026","by":"Ministry of Housing, Communities and Local Government (UK)","url":"https://assets.publishing.service.gov.uk/media/69c16a6113101e9908704acb/Future_Buildings_Standard_Impact_Assessment.pdf","page":77,"code":"Appendix B","label":"\"15 years for gas boilers\"","years":15,"note":"Printed page 77. Gas boilers in new non-domestic buildings (hot water; condensing by current regulations, so the condensing match is the stronger one). Assumption for new non-domestic buildings in England; the IA says the lifetimes are in line with BS EN 15459 (Annex/Appendix E), but they are stated as the department's own modelling assumptions, not a reproduced table. Round-number economic-appraisal assumptions, not observed lives. Same values as the January 2021 Future Buildings Standard consultation IA (separate file), so the two are not independent."}],"confidence":{"grade":"C","sample_size":null},"open_questions":["Every source here is a published planning, design or accounting life. None is observed replacement data."],"contributors":["unfinished.one editors"],"last_reviewed":"2026-10-22","canonical_url":"https://unfinished.one/c/boiler-hw-condensing","versioned_url":"https://unfinished.one/c/boiler-hw-condensing/v/0.2.0","licence":"CC-BY-4.0","citation":"unfinished.one (2026). Boiler, hot water, condensing, v0.2.0. https://unfinished.one/c/boiler-hw-condensing/v/0.2.0"}