Never seen one that was installed properly.
You are unlikely to see a properly installed Heatline because those very few are all working fine and never break down!
Tony
Well said tony.!
I have installed lots of theses for a landlord and up to now (finger crossed) i have not been called back to any of them.
Clean the system and they are very reliable.
Bengasman you keep installing you cdi eh, not everyone can afford a worcester boiler.You think just because they are cheap they are s h i t e.
WRONG