🔥 Clean smarter, heat better — don’t let sludge slow you down!
CosWarm CW3 Central Heating System Cleaner is a highly concentrated, non-toxic liquid solution designed to clean and descale boilers, radiators, and pipe systems. Treating up to 18 radiators per 500ml bottle, it safely removes rust, sludge, scale, and debris to maintain optimal heating efficiency across all common heating system materials.
| Units | 500.0 millilitre(s) |
| Brand | CosWarm |
| Format | Liquid |
R**R
Brilliant CH cleaning fluid
This product is amazing, we had no hot water in shower, although CH was fine, thought it was due to sticking switching valve. Put this CW3 in the system via towel rail and eezyfill dosing tool, took about 10 mins. Next morning shower hot and heating system quieter. Drained system after 4 days and then added CW1 and CW2. The boiler heating system and hot water are now perfect and so quite.Would highly recommend these products, saved me £300 in call out and replacement valve costs.
G**A
Useful stuff
Make sure you use this regularly, on a new system. Id say once a year, like having the chimney sweep in & top up with the same brand inhibitor. We fitted a screw type magnetic filter & have had no problems since.
J**Y
Cost effective, fast delivery
It was delivered quickly after the order. Packaging was adequate not excessive and the product seems cost effective.
D**E
Does what it says on the bottle
Absolutely fantastic product. Read a lot of reviews before buying this item. 100% worth it. Put it in my mums radiators and what a difference, the radiator is piping hot! Then I bought it again for my own and worked a treat. Highly recommend this product to anyone!
P**Y
Cleans well
This is added to the tank and left for a period of time. Certainly worked on my CH system and exposed an unanticipated weak spot.
A**R
Works well
Excellent!! It was very effective.
H**N
Happy
Works a treat!
D**H
Excellent product
Excellent product. Great value for money.
