Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Feb. 25, 2022	Jun. 30, 2021
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Document Transition Report	false
Entity File Number	001-35312
Entity Registrant Name	NUWELLIS, INC.
Entity Central Index Key	0001506492
Entity Incorporation, State or Country Code	DE
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
Title of 12(b) Security	Common Stock, par value $0.0001 per share
Trading Symbol	NUWE
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Entity Shell Company	false
Entity Public Float			$ 27.4
Entity Common Stock, Shares Outstanding		10,537,606
Auditor Firm ID	23
Auditor Name	Baker Tilly US, LLP
Auditor Location	Minneapolis, Minnesota