Document and Entity Information	3 Months Ended
	Mar. 30, 2014	May 05, 2014 Class A common stock	May 05, 2014 Class B common stock
Entity Registrant Name	WATTS WATER TECHNOLOGIES INC
Entity Central Index Key	0000795403
Document Type	10-Q
Document Period End Date	Mar. 30, 2014
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		28,682,611	6,489,290
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q1