# ISO 21978:2021 — Withdrawn and superseded ISO standards

For ISO 21978:2021, item title is Heat pump water heater — Testing and rating at part load conditions and calculation of seasonal coefficient of performance for space heating; status code is 9599; successor is ISO 21978:2023; withdrawn / published date is 2021-02-03, recorded from its source on 2026-08-05.

- **Identifier:** ISO 21978:2021 _(verified: appears in the quote below)_
- **Item title:** Heat pump water heater — Testing and rating at part load conditions and calculation of seasonal coefficient of performance for space heating _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 21978:2023
- **Withdrawn / published date:** 2021-02-03 _(verified: appears in the quote below)_

## What the source says

> 71639,IS,,ISO 21978:2021,Heat pump water heater — Testing and rating at part load conditions and calculation of seasonal coefficient of performance for space heating,Chauffe-eau à pompe à chaleur — Essais et classification à charge partielle et calcul du coefficient de performance saisonnier,2021-02-03,1,['27.080'],ISO/TC 86/SC 6,9599,,[83633],['en'],47,"<p>The document specifies test conditions for determining the seasonal performance characteristics of air source heat pump water heaters for space heating with electrically driven compressors with or without supplementary heater. The purpose of this document is to rate performance of the heat pump water heaters for space heating with no oper

## Source

- https://isopublicstorageprod.blob.core.windows.net/opendata/_latest/iso_deliverables_metadata/csv/iso_deliverables_metadata.csv

Last verified: 2026-08-05. Review by: 2027-02-01.
Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).