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Product Details

Cures small leaks from joints that are difficult to locate. Dosage 1L to treat 100L system.

Technical Specification
Manufacture ID ELS1
Safety Data Sheet click here
Volume (L) 1
Delivery details
Order value: Under £10 £10 & over
Express usually Next Business Day before 6pm £5 Free
Turbo usually Next Business Day before 12 noon £10 £5
Remote areas standard delivery (2-4 days) £5 Free
Order Value: Under £25 Over £25 but less than £75 £75 & Over
£10 £5 Free

Please note items delivered by our suppliers are not available for the options above. Delivery times may vary.

More about Delivery & Returns
Click & Collect details
If you are using our Click & Collect service please note the following:
  • Order online or over the phone and collect in branch from 10 minutes later.
  • Ensure you check stock is available for collection at your chosen branch.
  • Check branch opening hours to ensure you have sufficient time to collect.
  • For items not available for same day collection, place order before 8pm Mon-Sat (4pm Sun) and you can collect Next Business Day (Mon-Fri) after 3pm.
  • If we have your mobile number, we’ll send you a text when your order is ready to collect.
Central Heating Leak Sealer 1L is rated 4.7 out of 5 by 10.
Rated 4 out of 5 by from Good sealer for the cost I bought this again as ended up draining system to change a valve.it has worked well before too.easy use
Date published: 2018-03-14
Rated 5 out of 5 by from Fixed long term leak in my heating system. My heating system has been losing pressure constantly since I moved in meaning i had to keep the filling loop open to prevent air building up. With over 20 rads, I needed 2 litres, filling using a bathroom towel rail after draining down using a downstairs bleed valve with the system turned off. Now the system is fully pressurised and I don’t have to leave the filling loop open. excellent job. Competent diy-ers only though.
Date published: 2018-02-28
Rated 5 out of 5 by from It works. Had a tiny leak on a TRV. Within an hour of adding this to the system the leak had stopped. Not only does it work, it's cheap too.
Date published: 2017-09-27
Rated 5 out of 5 by from Great leak sealer Bought this , as after changing thermostatic radiator valves the system kept loosing pressure. After several days trying to find a leak, retightening valves. Put leak sealer in system and leak was sealed. Pressure has stayed the same ever since.
Date published: 2017-08-13
Rated 5 out of 5 by from leak sealer for radiators this leak sealer is Fantastick for at least 1 year or more a have used it before in deferent houses and it always works it safes a lot of work Anthony
Date published: 2017-06-08
Rated 5 out of 5 by from it worked nicely I had an undetectable leak in a sealed combination boiler system that caused the pressure to drop within about 4 days. Added two bottles of this and the pressure drop has ceased, so I presume it is fixed. Would be better if it were more concentrated though.
Date published: 2017-02-16
Rated 5 out of 5 by from Leak stopper that seams to work I was losing water pressure on central heating and after desludging and draining I put this in to the system . Within an hour my pressure was stabalizing and over 24 hours seemed to be back to normal . Been in for nearly a week and only a small loss of pressure so far
Date published: 2017-01-08
Rated 4 out of 5 by from Does what it says on the bottle Had a miinor leak develop at an awkward (practically impossible) to get at joint without hacking through 1½" polished solid Oak flooring. dosed the system with a couple of bottles of the Qual-Rad leak sealer (Large system) on the advice of my plumber SiL and lo and behold, the leak was sealed without having to destroy the floor to gain access to the leaking joint.
Date published: 2016-12-17
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