| Brand | Sentinel |
| Colour | Silver |
| Model | Sentinel X400 |
| MPN | X400 |
| Power Source | Hydronic (Hot Water) |
| Type | Storage Tank Water Heater |
Great product- Needed the 4 weeks to work to help remove a couple of radiators with cold spots aided by some ‘gentle’ periodic use of a dead blow plastic hammer at max temperature.
Our house was empty for a few years before we bought it and the heating was set very low so nearly all the radiators weren't getting hot, since letting this product sit in the system for a few weeks, it flushed out incredibly well and all the radiators are working perfectly!
Bought too clean a friend's c/heating system as per manufacturer's instructions we have to wait 2 weeks for it to work
Excellent system cleaner. Surprising how much gunk it can clear.
Certainly recommend this. I have a very old system and didn’t want to risk anything too strong. That said two weeks in and system without doubt is quieter.. Certainly buy again..
After looking at the reviews I opted to use this...I 100% agree with the reviews..Brilliant stuff.
Usual great service from TS & a great reduced price.
Removes gunk from heavily clogged system. Put it in and leave it for a few days to do its stuff
My heating system hasn't been drained for some years, so I thought I would use this product to give it a clean. I assume it works well because after a few days I drained the system and the water was black.I then refilled and added Sentinel inhibitor. All the radiators get hotter than before.
Useful flushing additive that saves time while working in the heating system
Does as it says. Inserted into heating system easily
Good product
Works well - put into the system ran for 3 weeks, emptied while hot, did a quick clear water flush then added inhibitor - pleasant staff in Banbury
Micro bore system was running fine, then Corgi three way valve failed so had to install new one. This upset the system and boiler started kettling. So tried X400, worked for about a week now worse than before. Will go back to the Fernox DS40 which fixed it 5years ago.
Excellent flushing agent which has cleared my CH system and it's now working much more efficiently.
Alway's use this as it works over 4 weeks to clean the system.
Cleans well. Used in a sealed system. Run for a few days and bleed dirty waty out. Make sure to put inhibitor in afterwards
Good system cleaner. Ive used multiple different ones and sentinel is one of the best
Radiators always had cold spots - this stuff sorted it in 2 hours.
Like to think my central heating is less sludgy now .
Excellent product, normally use x800 but tried the x400 and won’t use anything else now
