| Document and Entity Information | Sep. 15, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Sep. 15, 2021 |
| Entity Registrant Name | Nuwellis, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-35312 |
| Entity Tax Identification Number | 68-0533453 |
| Entity Address, Address Line One | 12988 Valley View Road |
| Entity Address, City or Town | Eden Prairie |
| Entity Address, State or Province | MN |
| Entity Address, Postal Zip Code | 55344 |
| City Area Code | 952 |
| Local Phone Number | 345-4200 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001506492 |
| Title of 12(b) Security | Common Stock, par value $0.0001 per share |
| Trading Symbol | NUWE |
| Security Exchange Name | NASDAQ |
