Hi All, I am looking to install a new garden tap at home. Some have told me that I would need a “double-check valve” fitted for the water supply, to prevent freezing the valve in cold weather. Is this an absolute requirement? Would this mean that I would have the valve inside the house and then use a garden tap that does not contain this valve inside it?
Asked by Jackie on 2nd Mar 2019
Are there any problems in using a tap with a check valve built-in, instead? IE – could it still cause freezing during cold weather? Any advice would be appreciated!
"Check valves are uses to prevent a back flow of water reaching the water mains system (which is required for water regulations anyway). They can be vulnerable to damage from frost, so it is best to have one fitted inside your property. The double check valve should be leading from the main supply, to the garden tap – if this is the case then this would be correct. "
Answered on 2nd Mar 2019 - Member since Mar 2019 - report
P Bradley Plumbing & Heating
"Water regulations stipulate that you must have a non-return valve ie check valve to prevent back flow and water contamination. An isolation valve is not a legal requirement but is a good idea for the winter to turn the water off to the outside tap to prevent frozen pipes."
Answered on 2nd May 2019 - Member since Nov 2018 - report
Middlesex Plumbing and Heating
"A Check valve is a non return valve, it is essential to have this fitted to an outside tap to stop the possibility of back flow and potentially contaminated water from outside re entering the potable water in your taps."
Answered on 22nd Jul 2019 - Member since Jun 2019 - report
nlt plumbing and heating
"Fitting a check valve will not stop it freezing it stop the back flow from what ever is in the hose that could contaminate your inside tap water. Outside taps can come with check valve in already. So yes always fit a check valve"
Answered on 17th May 2019 - Member since May 2019 - report
Answered on 1st Aug 2019 - Member since Jun 2016 - report
Using a check valve within the tap is apparently against regulation but it still does the same job. I think more because it is only a single check valve and you require a double check valve. if you're worried about the tap freezing a bursting in the coming winter then i also recommend a isolation valve so you can turn it off in winter."
hope plumbing & heating ltd
"A check valve will not prevent freezing however it prevents any back flow of water into your plumbing system
Answered on 7th Aug 2019 - Member since Aug 2019 - report
I would suggest you install a tap with built in check valve."
"A check valve doesn’t prevent freezing, it prevents contamination of the water supply caused by back flow. A check valve on a garden tap is a requirement of the 1999 water Regulations. An isolation valve inside the property would enable you to shut off the water supply to the tap in winter helping to prevent the tap freezing.
Answered on 29th May 2019 - Member since Aug 2018 - report
Hope this helps"
"Yes, you must have a check valve either in the tap or in the pipework from the mains to the tap. This is to stop back feed of stale or contaminated water."
Answered on 31st May 2019 - Member since May 2019 - report
D&S Plumbing & Heating
"With or without check valve you may still get freezing. A double check valve is to stop back flow of water contamination"
Answered on 17th Aug 2019 - Member since Oct 2018 - report
Cls Plumbing & Renovation
"You MUST use a tap with a check valve they are inbuilt into the tap so not a separate item, fit an isolation valve inside the property so you can turn off in winter if needed. If you do open the external tap to drain the small amount of water lodged in the tap body."
Answered on 19th Jul 2019 - Member since Jul 2019 - report
Doc's electrical and plumbing
"Fit a service valve inside, during extreme weather
Answered on 30th Apr 2019 - Member since Jul 2018 - report
Close service valve and open outside tap slightly"