The most common reason is corrosion in the system, this can be caused my the system not being flushed out correctly when new or being wrongly installed, but it takes quite a few years for the first radiator to leak. the system needs checking over, if any design fault is found it needs rectifying then flushing out and inhibitor added.
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Company Registration: 4261333 - Corgi Registration: 171871 - VAT Registration No: 700883645
Unit 10, Lambourne Crescent, Cardiff Business Park, Llanishen. Cardiff. CF14 5GG
Telephone: 0845 2600 321 - Fax: 0845 2600 322

 
Heatforce
Unit 10, Lambourne Crescent,
Cardiff Business Park, Llanishen.
Cardiff. CF14 5GP.
TEL: 0845 2600 321
links myheatingservice.com mybathroomshowroom.com myfireplaceshowroom.com