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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.

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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 5 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.
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Central Heating Leak Sealer 1L is rated 4.8 out of 5 by 16.
Rated 5 out of 5 by from It works !/2 bar leak over 4 days. nothing visible at boiler or rads. Tried this in a 9 rad house. After a week pressure hasn't dropped. Success. One bottle was enough.
Date published: 2019-09-18
Rated 5 out of 5 by from Heating leak seal 1ltr Price ok looks ok can’t be that bad when 5star by plumbers
Date published: 2019-09-14
Rated 5 out of 5 by from Saved a Fortune My Boiler was leaking where the inlet pipe screws into the Heat exchanger at the back of the boiler so that the nut cannot be accessed without a complete strip down. I drained the loft tank plus an extra 10 litres and then using a funnel poured 2litres of Qual Rad directly into the the pipe work and refilled.After a few hours the leak had sealed which must have saved me hundreds of pounds or even a new boiler.
Date published: 2019-05-14
Rated 5 out of 5 by from Pressure Loss Had a slow pressure loss over a number of months, unable to pinpoint leak, during a rad change dropped tub contents in via open pipe, weeks later no pressure loss.
Date published: 2019-04-28
Rated 5 out of 5 by from Excellent Very good and done the job
Date published: 2019-03-04
Rated 5 out of 5 by from Does what it says on the label We used this on the central heating system as some radiators had been added in our extension. There appeared to be a consistent loss of pressure so we suspected a minor leak. Popped this liquid in which was easy to do and now the system works fine. Would buy again
Date published: 2019-02-23
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
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