Uniformat D2020
Water heater, tankless gas
Also called on-demand water heater, instantaneous water heater, tankless
Service life
Years in service. The band runs from the shortest to the longest life the sources state, so it shows how much they disagree, not how long 80% of units last. The line is the median of the stated lives.
Basis
- 20 years · CNA e-Tool Estimated Useful Life Table, p10 · HUD CNA 3.4.1.2.4 “External tankless heater, gas or electric” — U.S. Department of Housing and Urban Development (planning life)Same life for family and elderly properties. US multifamily housing. HUD's row covers gas and electric tankless heaters.
- 17 years · Energy Conservation Program: Energy Conservation Standards for Commercial Water Heating Equipment (final rule), 88 FR 69686, October 6, 2023, p70 · IV.F.6 “Table IV.21: "Gas-fired instantaneous water heaters and hot water supply boilers: Tankless water heaters ... 17" years” — U.S. Department of Energy (planning life)Printed page 69755. class: commercial gas-fired tankless (instantaneous) water heaters.
- 20 years · Energy Conservation Program: Energy Conservation Standards for Consumer Gas-fired Instantaneous Water Heaters (final rule), 89 FR 105188, December 26, 2024, p43 · IV.F.6 “"DOE estimates the average product lifetime to be around 20 years for instantaneous water heaters"” — U.S. Department of Energy (planning life)Printed page 105230. residential: consumer gas-fired instantaneous water heaters (<2 gal, >50,000 Btu/h). Table V.2 (p.75, printed 105262) shows 20.0 years average lifetime at every efficiency level.
How sources are chosen and recorded: sourcing policy.
Municipal lives for plumbing (D20)
24 municipalities in Ontario and British Columbia state a life for plumbing as a whole, in 17 distinct tables: 15–50 years, median 25. These come from capital asset policies: accounting lives, used for amortization. They describe the system rather than this component, and none is a measured life.
Years. Each dot is one stated life and each bar a stated range; equal values stack. The dashed line is the median. Policies that copy the same table count once.
All 25 stated lives
| Municipality | As written | Years | Kind | Source |
|---|---|---|---|---|
| Kingston | Building Fixtures | 15 | accounting | p15 · 2016 |
| Meaford | Plumbing - Water Treatment System | 15 | accounting | p17 · 2020 |
| Trent Lakes | Mechanical Systems - Fixtures | 15 | accounting | p10 · 2009 |
| Fort St. James, Revelstoke, Rossland, Tumbler Ridge · same table | Electrical/Plumbing/Fire | 15–20 | accounting | p5, p9, p7, p5 · 2010 |
| Okanagan-Similkameen | Electrical/Plumbing/Fire | 15–20 | accounting | p11 · 2023 |
| Salmo | Electrical/Plumbing/Fire | 15–20 | accounting | p6 · 2016 |
| Comox Valley | HVAC systems, mechanical, plumbing, wiring, etc. | 20 | accounting | p6 · 2010 |
| Cranbrook | HVAC, plumbing, lighting, etc | 20 | accounting | p9 · 2010 |
| Telkwa | Electrical/Plumbing/Fire | 20 | accounting | p8 |
| London | Building Components - Services (HVAC, lighting, communication, plumbing etc.) | 20 | accounting | p2 · 2023 |
| Meaford | Plumbing - Fixtures | 20 | accounting | p16 · 2020 |
| Meaford | Plumbing - Boiler | 20 | accounting | p17 · 2020 |
| Meaford | Plumbing - Septic System | 25 | accounting | p17 · 2020 |
| Rainy River | Building Improvements - Electrical/Plumbing | 25 | accounting | p11 · 2010 |
| The Blue Mountains | Septic System | 25 | accounting | p11 · 2019 |
| Bancroft, Centre Hastings, Hastings Highlands, Wollaston · same table | Electrical/Plumbing | 25–30 | accounting | p5, p4, p6, p5 |
| Greater Napanee | E30 Chillers, Rink Piping, Fuel Storage Tanks | 30 | accounting | p16 · 2012 |
| Grey Highlands | Septic System | 30 | accounting | p11 · 2026 |
| The Blue Mountains | Plumbing System | 30 | accounting | p11 · 2019 |
| Trent Lakes | Mechanical Systems - Piping | 30 | accounting | p10 · 2009 |
| Parksville | Plumbing Infrastructure | 50 | accounting | p9 · 2023 |
| Greater Madawaska, Quinte West · same table | Piping | 50 | accounting | p17, p38 · 2025 |
| Meaford | Plumbing - System | 50 | accounting | p16 · 2020 |
| Meaford | Plumbing - Cistern | 50 | accounting | p16 · 2020 |
| The Blue Mountains | Cistern | 50 | accounting | p11 · 2019 |
Each row was matched to its page automatically: the label and the number appear in the text of the cited page. An editor has not yet compared every row with the table, so follow the page link before relying on one. About the policies · All approved rows as JSON
Preventive maintenance
No maintenance tasks are sourced for this component yet.
Open questions
- Every source here is a published planning, design or accounting life. None is observed replacement data.
- No preventive maintenance tasks are sourced yet.
Know the answer? Send it with a source to [email protected].
Cite this
Citation
unfinished.one (2026). Water heater, tankless gas, v0.2.0. https://unfinished.one/c/water-heater-tankless/v/0.2.0BibTeX
@misc{unfinished_water_heater_tankless_0_2_0,
title = {Water heater, tankless gas},
author = {{unfinished.one}},
year = {2026},
version = {0.2.0},
url = {https://unfinished.one/c/water-heater-tankless/v/0.2.0},
note = {CC BY 4.0}
}Licence CC BY 4.0 · How to cite · JSON · Versions: 0.2.0, 0.1.0